The Influence of Habitat Conditions on the Properties of Pinewood

Round 1

Reviewer 1 Report

Big Picture:

The research highlights some aspects that have not been enough studied so far.

I believe that various aspects of the paper should be added or modified to increase the impact of this paper. So, I have further highlighted the aspects that need to be improved.

Abstract: Please add some information in abstract about the importance of wood like: represent an environmentally sustainable material and a renewable resource

 

Introduction: You should define research objectives in this chapter

Line 25 -26: Please provide value of correlation coefficient

Line 30: „Variability in the quality of raw wood is largely caused by the condition of trees”

• Please add reference. See: 

Assmann E (1970) The principles of forest yield study. Pergamon Press, Oxford

Pretzsch, H., Rais, A. Wood quality in complex forests versus even-aged monocultures: review and perspectives. Wood Sci Technol 50, 845–880 (2016). https://doi.org/10.1007/s00226-016-0827-z

 

Lines 43-44: „The type of forest habitat is a classification unit which comprises forest areas with similar  climatic conditions, soil fertility, moisture, landform, and geological structure”

• Please provide references

 

Lines 63-64: „The type of forest soil is strictly defined and reflects the fertility of the area in which trees grow.”

• Is not the only factor, also forest site determines the forest growth (eq. in a beach forest site the Scots pine will not have significant grow)

Line 77-78: „Due care, the selection of the best trees, and reducing the number of weaker ones is important aspects affecting the quality of tree complexes.”

• Correct but you must specify that the selection must be made in a controlled mode in order to not destabilize the stand

 

Lines 85-88: “Contemporary management methods 85 based on the environment-friendly ‘green order’ trends favour the reconstruction of the species composition in tree complexes in accordance with the prevailing habitat conditions”

• Please provide references

 

Line 88: “This action is taken to promote biodiversity in forests” –

• not only, also to create a higher stability of the stand and by creating the opportunity to develop the inter- and intra-specific processes in order obtain higher wood quality by the natural elimination of malformed trees

Line 113: “ … average about 20 kg/m3..”

• Please provide reference

 

Materials and Methods:

Lines 125-126: „The height of the forest district area ranges from 70 to 110 m AMSL.”

• change "height of forest district" with " the altitude of" or elevation

 

Lines 161 – 163: „Next, each piece of wood was sawn so that the material contained a 50-mm-thick core part. In this way, samples for mechanical tests were prepared.”

• Why did you use this method? In order to create a uniformity in the samples and not to appear other variables that can influence the results of the analyzes? If so, this should be specified in the text

 

Lines 168 -168: „The flexural strength was tested in accordance with the PN-D-04103:1977 [32] standard”

Because, it is an important aspect of the methodology by which this research is done, it should be a little more detailed or add a DOI link should in the references. Another solution would be to add this aspect to the supplementary material.

Results

Figure 4. Rearrange the graphic to be more visible. The equations should be aligned and also the correlation coefficient. Maybe you should information about correlation coefficient and equations in a in a table.

 

Discussion

Line 250-251: “Apart from that, the variability of wood density also depends on external factors…”

• Please specify what external factors

Conclusions

Conclusion section should by detailed, according the results of the research.

 

References

The references contain mainly national inputs. You should add some international references.

Author Response

Thank You to the reviewer for taking the time to review the article and for Your valuable comments. 

They significantly improved the manuscript. I hope that the revised version will meet Your requirements.

Responses to comments:

Abstract: Please add some information in abstract about the importance of wood like: represent an environmentally sustainable material and a renewable resource

Corrected

Introduction: You should define research objectives in this chapter

Corrected

Line 25 -26: Please provide value of correlation coefficient

Corrected

Line 30: „Variability in the quality of raw wood is largely caused by the condition of trees”

Corrected

• Please add reference. See: 

Assmann E (1970) The principles of forest yield study. Pergamon Press, Oxford

Pretzsch, H., Rais, A. Wood quality in complex forests versus even-aged monocultures: review and perspectives. Wood Sci Technol 50, 845–880 (2016). https://doi.org/10.1007/s00226-016-0827-z

Corrected

Lines 43-44: „The type of forest habitat is a classification unit which comprises forest areas with similar  climatic conditions, soil fertility, moisture, landform, and geological structure”

• Please provide references

 Corrected

Lines 63-64: „The type of forest soil is strictly defined and reflects the fertility of the area in which trees grow.”

• Is not the only factor, also forest site determines the forest growth (eq. in a beach forest site the Scots pine will not have significant grow)

• Corrected

 

Line 77-78: „Due care, the selection of the best trees, and reducing the number of weaker ones is important aspects affecting the quality of tree complexes.”

• Correct but you must specify that the selection must be made in a controlled mode in order to not destabilize the stand

• Corrected

 

Lines 85-88: “Contemporary management methods based on the environment-friendly ‘green order’ trends favour the reconstruction of the species composition in tree complexes in accordance with the prevailing habitat conditions”

• Please provide references

 Corrected

Line 88: “This action is taken to promote biodiversity in forests” –

• not only, also to create a higher stability of the stand and by creating the opportunity to develop the inter- and intra-specific processes in order obtain higher wood quality by the natural elimination of malformed trees

• Corrected

Line 113: “ … average about 20 kg/m3..”

• Please provide reference

 Corrected

 

Materials and Methods:

Lines 125-126: „The height of the forest district area ranges from 70 to 110 m AMSL.”

• change "height of forest district" with " the altitude of" or elevation

 Corrected

Lines 161 – 163: „Next, each piece of wood was sawn so that the material contained a 50-mm-thick core part. In this way, samples for mechanical tests were prepared.”

• Why did you use this method? In order to create a uniformity in the samples and not to appear other variables that can influence the results of the analyzes? If so, this should be specified in the text

 Corrected

Lines 168 -168: „The flexural strength was tested in accordance with the PN-D-04103:1977 [32] standard”

Because, it is an important aspect of the methodology by which this research is done, it should be a little more detailed or add a DOI link should in the references. Another solution would be to add this aspect to the supplementary material.

Corrected

 

Results

Figure 4. Rearrange the graphic to be more visible. The equations should be aligned and also the correlation coefficient. Maybe you should information about correlation coefficient and equations in a in a table.

 Corrected

 

Discussion

Line 250-251: “Apart from that, the variability of wood density also depends on external factors…”

• Please specify what external factors

• Corrected: e. the type of forest habitat, wind and other forces to which trees are exposed

 

Conclusions

Conclusion section should by detailed, according the results of the research.

 Corrected

 

References

The references contain mainly national inputs. You should add some international references.

Corrected

Reviewer 2 Report

Comments and suggestions in the attached file.

Author Response

Thank You to the reviewer for taking the time to review the article and for Your valuable comments. 

They significantly improved the manuscript. I hope that the revised version will meet Your requirements.

Responses to comments:

 

2 Major prompts

2.1 Title

The paper is not about habitat conditions but about forest habitats. It is not clear what is meant by raw wood - is it fresh wood in the trunk or really raw wood? 

I recommend to rephrase the title.

Corrected

2.2 Abstract

The text is confusing, it is supposed to be an introduction to a series of papers on the effect of habitat conditions on wood properties. However, there is no mention of specific habitat conditions in the manuscript. Any description of the habitat is generally absent from the paper. An insignificant number of plots without repetition are chosen for the study, so the conclusions are highly speculative. The properties studied depend to a large extent on the wood structure; attention should be focused on the relationship between the tree-ring width and the wood properties, or the proportion of latewood and the wood properties.

Corrected

2.3 Introduction

The introduction is not as developed as I would expect to see in an academic journal article. 

The intro is based on citations of mostly Polish literature and omits the current state of knowledge. From the practical point of view of the evaluation of wood in products, the determination of the strength class according to EN 338 is important. To do this, it is necessary to know not the mean values of properties, but 5% quantiles. 

The EN 338 standard "Structural timber - Strength classes - This European Standard establishes a system of strength classes for general use in design code" is applicable to structural timber and in case of testing samples without defects it might not fulfil the expected requirements, therefore general tests based on average values have been adopted. In the next studies in the series, 5% quantiles values will be included for statistical comparisons of the tests (in this study, the 5% quantiles corresponded to the minimum strength test value).

There is no description of the differences between the different types of forest, or their relationship to the trophicity of the habitat and its moisture balance. The relationship between environmental characteristics (habitat conditions) and forest type, which is crucial for understanding the results, is not clear. 

Corrected

There is a lack of info on the variability of wood properties both between trees and within a single stem. In particular, I lack data on variability of properties along the radius of the trunk and along the height of the trunk, or the effect of the trunk form.

Corrected

Also missing are data on the extent to which drought stress or other stressors affect wood properties.

We did not have this data but will incorporate comments in subsequent research and studies.

2.4 Methodology

A small number of plots without repetition is chosen; one plot for one forest type is not representative.

The research is an introduction to a full cycle of habitat experiments from selected areas of Poland and describes characteristics of pine raw material of domestic origin. In subsequent studies the experimental area will be extended 

Overall, the design of the experiment is unclear and inconclusive. There is a lack of description of the plots and indication of the differences between them (it is not clear what the moisture variation was, for example). The number of sample trees per plot and their choice (e.g. canopy position) is not given; there is no description of the method used to select the test specimens; the number of specimens per tree or plot is not given. It is not clear from which part of the stem the test specimens come. 

Corrected

In addition to the bending strength, the modulus of elasticity, which is a real material constant, must also be monitored. For the bending strength it is not clear whether it is a ultimate strength or a proportionality limit. In terms of practical use of the results, the proportionality limit should be focused on. 

Corrected

Max static flexural strength as an index of strength was studied.

Anything relating to the structure of the wood, particularly the width of the flight ring, is missing.

 

2.5 Results

The moisture content at which the wood properties were tested is not given. It is not stated how the wood was conditioned to this humidity. 

Corrected

The mean values should be supplemented with estimates of 5% quantiles and only then statistically compared. This must be preceded by a normality test. The coefficients of variation must then be reported (and subsequently compared with the literature data). 

Note valid for tests according to EN338 but the present results did not apply to structural timber.  It will be taken into account in extended tests. Due to the assumption of average flexural strength values for statistical analysis, it was decided to stay with the proposed results.

For Fig.4, show a single dependence between wood density and flexural strength so that one function holds for all plots. It is not clear in the figure what each point corresponds to.

Corrected

2.6 Discussion

The results are mainly compared only with the Polish literature. 

Corrected

The variability of the data is not explained. 

Corrected

There is no discussion of the results from a practical point of view - why is it good to know the effect of habitat on wood properties and why is it good to know wood properties at all? 

Comparison of results with strength classes according to EN 338 is missing. 

Corrected

The discussion of the effect of age is speculative. 

Neither the discussion nor the results themselves are conclusive. 

Good point, the results provide a basis for further research.

2.7 Conclusion

Lack of clear and unambiguous results, “message-to-take-home”. The results are limited to a description

of statistical outcomes, but this is not helpful. Explanation of the effect of habitat conditions (which

ones) on wood properties (what and how) is lacking.

Corrected

Reviewer 3 Report

Even though the topic of this manuscript is interesting, there are some issues that should be addressed before publication. Here are my comments and recommendations aiming to help towards the improvement of this work. In the abstract, the same sentence is repeated in lines 20-24. You should make the necessary corrections. Additionally, in the abstract, you describe that a correlation between habitat and wood quality was confirmed, but without revealing the most significant results. In my opinion, you should provide the most significant finding (probably this correlation level) providing also some quantitative results/percentages etc. In the key words, keep the word "habitat" istead of "type of forest habitat". You could add also the words "climate", "soil" etc. In the Introduction chapter, in line 33, you should provide a reference. The phrase you use in the text "utility property" does not seem to be correct, please check that again. In line 37, you rather use passive voice in the verb "translate". In lines 38-39, please provide the reference for this statement. In lines 37-40, how is the ratio of mature-juvenile wood correlated to habitat type? Please, explain. In line 41, you rather use the word "precisely/accurately" instead of "correctly". In line 42, probably "density" instead of "weight"? In lines 44 and 50, please provide the respective references on these statements. Is the classification system of individual forest areas that you used (applied in Poland) common also for other countries? Is there another international classification system that could have been used?  Generally, the list of references you based your research on are most of them of specific origin (polish, russian). Since you have chosen to publish your work on an international journal, you should incorporate also of different origin studies, on an international range. For example, I would highly recommend to incorporate also the following significant studies: 

• DOI: 10.1002/bbb.2235, 

https://doi.org/10.1016/S0304-3800(99)00086-1

 and 

http://www.woodresearch.sk/wr/201402/16.pdf

. In line 74, you rather use the word "influence" instead of "may change". In lines 80-81, please rephrase to clarify the meaning (what kind of work should be done?).

In line 83 (as well as in the whole text), the use of "coniferous forest" is not clear and also the difference between coniferous forest and pine-tree complexes. You rather find a way to clarify and specify these terms. Lines 88-89 should be rephrased to be clarified. In line 96, the title "Pinewood properties" should be removed. If you declare in lines 103-104 that "The variability of the habitat conditions directly translates into the internal macro- 103 structure of wood and its quality", what is the novelty of your results? The last paragraph of introduction should be rewritten since the meanings and the objective of the study are not at all clear and comprehensive. I could not find the gap in literature and the significance of this work in this part of text. In Materials-Methods chapter nothing is declared about the climatic conditions. In line 140-147, provide the latin names. In line 148, what do you mean wood stregth (static bending strength)? Line 153, where did you base these divisions on (standard, previous study)? Why did you use polish and not international or at least european standards for mechanical tests? You did not provide details on the sampling or wood samples, the number of trees examined, the place/height of these samples in trunk. There are not the necessary details on the statistical analysis (software used, one/two way etc.). Lines 253-255 need to be analysed, explained. In lines 275-276, please provide a reference on that. In lines 293-300, describe the way of influence/correlation. The discussion should be enriched providing comparisons to previous results and in conclusions, you should provide also a stronger conclusion beyond repeating results. 

Author Response

Thank You to the reviewer for taking the time to review the article and for Your valuable comments. 

They significantly improved the manuscript. I hope that the revised version will meet Your requirements.

Responses to comments:

 

Even though the topic of this manuscript is interesting, there are some issues that should be addressed before publication. Here are my comments and recommendations aiming to help towards the improvement of this work. In the abstract, the same sentence is repeated in lines 20-24. You should make the necessary corrections.

Corrected

Additionally, in the abstract, you describe that a correlation between habitat and wood quality was confirmed, but without revealing the most significant results. In my opinion, you should provide the most significant finding (probably this correlation level) providing also some quantitative results/percentages etc.

Corrected

 In the key words, keep the word "habitat" istead of "type of forest habitat". You could add also the words "climate", "soil" etc.

Corrected

In the Introduction chapter, in line 33, you should provide a reference. The phrase you use in the text "utility property" does not seem to be correct, please check that again.

Corrected

In line 37, you rather use passive voice in the verb "translate".

Corrected

In lines 38-39, please provide the reference for this statement.

Corrected

 In lines 37-40, how is the ratio of mature-juvenile wood correlated to habitat type? Please, explain.

Corrected in text

In line 41, you rather use the word "precisely/accurately" instead of "correctly".

Corrected in text

In line 42, probably "density" instead of "weight"?

Corrected in text

In lines 44 and 50, please provide the respective references on these statements.

Corrected in text

Is the classification system of individual forest areas that you used (applied in Poland) common also for other countries? Is there another international classification system that could have been used? 

The  European  Forest  Types  (EFT)  classification  (EEA  2006,  2007),  has  been  developed   in assessment of forests for the  EUNIS  Habitat  Classification,  provides  a  European  reference  set  of  habitat  types  with  a common  unit  description  within  a  hierarchical  classification.  Crosswalks between habitat  types  and  vegetation  syntaxa  were  first developed  in  1998   and  updated  in  2012 . However, it was considered that in the case of Poland, the national forest habitat classification would be more appropriate.

 

Generally, the list of references you based your research on are most of them of specific origin (polish, russian). Since you have chosen to publish your work on an international journal, you should incorporate also of different origin studies, on an international range. For example, I would highly recommend to incorporate also the following significant studies: 

• DOI: 10.1002/bbb.2235, 

https://doi.org/10.1016/S0304-3800(99)00086-1

 and 

http://www.woodresearch.sk/wr/201402/16.pdf

Corrected

 In line 74, you rather use the word "influence" instead of "may change".

Corrected in text

 In lines 80-81, please rephrase to clarify the meaning (what kind of work should be done?).

Corrected in text

In line 83 (as well as in the whole text), the use of "coniferous forest" is not clear and also the difference between coniferous forest and pine-tree complexes. You rather find a way to clarify and specify these terms.

The introduced division of forests is based on two basic parameters. They are graded from the lowest soils, i.e. coniferous forests, to fertile soils, i.e. fresh forests.

Lines 88-89 should be rephrased to be clarified.

Corrected in text

In line 96, the title "Pinewood properties" should be removed.

Corrected in text

 If you declare in lines 103-104 that "The variability of the habitat conditions directly translates into the internal macro- 103 structure of wood and its quality", what is the novelty of your results?

The variability of the habitat conditions directly translates into the internal macrostructure of wood and its quality. However, the correlation between these parameters is still not confirmed.

The last paragraph of introduction should be rewritten since the meanings and the objective of the study are not at all clear and comprehensive. I could not find the gap in literature and the significance of this work in this part of text.

Corrected in text

In Materials-Methods chapter nothing is declared about the climatic conditions.

Corrected in text

In line 140-147, provide the latin names.

Corrected in text

In line 148, what do you mean wood stregth (static bending strength)?

Corrected in text

Line 153, where did you base these divisions on (standard, previous study)?

Divisions on distribution was based on available habitats where logging operations were carried out

Why did you use polish and not international or at least european standards for mechanical tests?

The studies were carried out over a longer period of time, hence the reference to the initially introduced national standards

You did not provide details on the sampling or wood samples, the number of trees examined, the place/height of these samples in trunk.

Corrected in text

There are not the necessary details on the statistical analysis (software used, one/two way etc.). Lines 253-255 need to be analysed, explained. In lines 275-276, please provide a reference on that. In lines 293-300, describe the way of influence/correlation. The discussion should be enriched providing comparisons to previous results and in conclusions, you should provide also a stronger conclusion beyond repeating results. 

Corrected in text

 

Round 2

Reviewer 2 Report

The authors have attempted to incorporate comments from opponents, but the results of the manuscript remain speculative.
The effect of habitat conditions is not explained, as it is unlikely that the best wood properties would be achieved on a site with poor soil. In addition, all 4 plots are similar in terms of water regime influence - all are marshes in the topsoil and all are wet in the deeper soil layers. It is therefore understandable that in Figure 4, with the exception of one site, the others do not differ in their characteristics.
Thus, the reasons for the differences in timber properties between sites will be due to e.g. spatial forest management rather than ecotope characteristics.
This fundamental comment was not taken into account in the editing of the manuscript. I ask the authors for their comments.

Author Response

Reviewer 2

Thank You very much for your thorough evaluation of our publication. Your comments and corrections are very valuable. They represent a significant improvement in the quality of the publication. We hope that the present explanations will be satisfactory to You.

 With best regards

Authors

 

The authors have attempted to incorporate comments from opponents, but the results of the manuscript remain speculative.
The effect of habitat conditions is not explained, as it is unlikely that the best wood properties would be achieved on a site with poor soil.

 Corrected line 334:

The conducted research confirms the experience of other researchers for Scots pine in northern and central Europe, where an increase in the proportion of higher-density wood, responsible to a considerable extent for wood strength on poor soils, was confirmed. Higher quality habitats (former farmland) increase the width of annual increment and decrease the strength properties of Scots pine wood

In addition, all 4 plots are similar in terms of water regime influence - all are marshes in the topsoil and all are wet in the deeper soil layers. It is therefore understandable that in Figure 4, with the exception of one site, the others do not differ in their characteristics.

The selection of plots with similar moisture content was made on purpose ( to avoid multiplication of influencing factors ) in order to indicate the influence of soil quality on the shaping of pine wood quality traits.

Thus, the reasons for the differences in timber properties between sites will be due to e.g. spatial forest management rather than ecotope characteristics.

Corrected line 133:

The management process in the studied plots was identical due to the same way of forest management carried out in the whole area of the Forest District.

Reviewer 3 Report

The reviewer checked the revised version of the manuscript and concludes that the manuscript still needs much improvement. Most of the literature used in the MS is national/polish, while several significant and relevant studies of this field have been neglected. The last paragraph of introduction is still not comprehensive and does not provide the objective of this work. The meanings of terms Habitat, quality etc. has not been clarified. There are still several grammatical and syntactical errors in the text (example: line 77: "Forest habitat determine forest growth"). You should check the whole manuscript text again. Generally, even though a limited attempt of improvement has been implemented, I recommend to the authors to check again all the points of my previous review, in order to enhance the quality of the manuscript. 

Author Response

Reviewer 3

Thank You very much for your thorough evaluation of our publication. Your comments and corrections are very valuable. They represent a significant improvement in the quality of the publication. We hope that the present explanations will be satisfactory to You.

 With best regards

Authors

 

The reviewer checked the revised version of the manuscript and concludes that the manuscript still needs much improvement. Most of the literature used in the MS is national/polish, while several significant and relevant studies of this field have been neglected.

Corrected

Kamperidou, V.,  Terzopoulou, P.,  Barboutis, I. Marginal lands providing tree-crop biomass as feedstock for solid biofuels. Biofules Bioproducts Biorefining 2021; 15 (5), 1395-1405. DOI:10.1002/bbb.2235.

Burawska-Kupniewwska I., Krzosek S., Mańkowski P., Grześkiewicz M., Mazurek A. The influence of pine logs (Pinus sylvestris L.) quality class on the mechanical properties of timber, BioResources 2019; 14(4), 9287-9297. DOI: 10.1376/biores.14.4.9287-9297.

Vestel , G.I., Heibe, O. Bending strength and modulus of elasticity of Pinus sylvestris round timber from southern Norway. Scandinavian Journal of Forest Research 2010; 25. 185-195. DOI: 10.1080/02827581003730757.

Benas Šilinskas B., Varnagiryte-Kabašinskiene I., Aleinikovas M., Beniušiene L., Aleinikoviene J., Škema, M. Scots Pine and Norway Spruce Wood Properties at Sites with Different Stand Densities. Forests 2020; 11, 587. DOI:10.3390/f11050587.

Shukl,  S. R., Kamdem, DP.. Physical and mechanical properties of red pine (pinus resinosa ait.) from three provenances. Wood and Fiber Science 2008; 40(1), 103 – 110

Kamperidou V., Barboutis, I., Vasileiou V. Influence of thermal treatment on mechanical strength of scots pine (pinus sylvestris l.) wood. Wood Research 2014.  59 (2):  373-378. http://www.woodresearch.sk/wr/201402/16.pdf

 

The last paragraph of introduction is still not comprehensive and does not provide the objective of this work.

Corrected: line 133

Such a considerable site differentiation was the basis for undertaking studies on the correlation of Scots pine (Pinus sylvestris L.) wood quality determined by bending strength factor with forest site types in selected regions of northern Poland. In order to minimize the factors shaping the quality characteristics of pine raw material (density, strength properties), an area with a similar form of forest management and a similar level of groundwater for variable soil fertility was assumed.

The meanings of terms Habitat, quality etc. has not been clarified.

Explained: line 46 and 74

The type of forest habitat is a classification unit which comprises forest areas with similar climatic conditions, soil fertility, moisture, landform, and geological structure. All these features significantly affect the habitat productivity and the breeding capacity of the type of forest habitat. The species composition of a tree complex, appropriate for a particular type of forest habitat, is related with the ecological selection and shaping of the tree complex.

 

There are still several grammatical and syntactical errors in the text (example: line 77: "Forest habitat determine forest growth").

A stylistic and grammatical revision of the text was performed.

You should check the whole manuscript text again. Generally, even though a limited attempt of improvement has been implemented, I recommend to the authors to check again all the points of my previous review, in order to enhance the quality of the manuscript. 

The text was revised again consistent with the reviewer's earlier comments

 

Round 3

Reviewer 2 Report

After reading the third version of the manuscript entitled "The Influence of Habitat Conditions on the Properties of Raw Wood", I can state that most of the comments and suggestions of the opponents have been incorporated. Although there are some typos in the text (lines 449, 452, 725, 924), and on line 655 it is better to use the term "the weakest wood" instead of "the least durable wood", the text basically meets the requirements of a scientific article.
I leave for consideration the deletion of part of the discussion on lines 668-684, which is irrelevant given the focus of the manuscript.

Author Response

In accordance with the reviewer's comment, the term: "the least durable wood" was changed to: "the weakest wood". Minor corrections were made to lines: 32, 206, and 344 (marked in red).  We thank you for your suggestions.

 

Reviewer 3 Report

There is the need to add references for what you refer in the text in the theoretical part. Generally, the manuscript has been improved, but should provide infomration on the clt production concerning the species and methodology.

Author Response

Reviewer1

 

There is the need to add references for what you refer in the text in the theoretical part. Generally, the manuscript has been improved, but should provide infomration on the clt production concerning the species and methodology.

Coreccted:

Pine is one of the main species used, among other things, for the production of cross laminated timber (CLT)

1. Muszynski L., Larasatie P., Guerrero J.E.M., Albee R., Hansen E.N., 2020: Global CLT industry in 2020: Growth beyond the Alpine Region, Proceedings of the 63rd International Convention of Society of Wood Science and Technology, July 12-17, 2020 - Virtual Conference
2. Brandner R., 2013: Production and Technology of Cross Laminated Timber (CLT): A state-of-the-art. Report, Focus Solid Timber Solutions – European Conference on Cross Laminated Timber (CLT), COST Action FP1004, Graz; 3-36
3. Ebner G., 2017:CLT productions in Europe 2016-2020, TIMBER-ONLINE.net, https://www.timber-online.net/holzprodukte/2017/10/brettsperrholz-produktionen-in-europa-20162020.html

We thank you for your suggestions.