Enhanced Isohydric Behavior Decoupled the Whole-Tree Sap Flux Response to Leaf Transpiration under Nitrogen Addition in a Subtropical Forest
Abstract
:1. Introduction
- Whether the whole-tree water transport capacity would consistently be enhanced by the N additions;
- Whether the above behavior would be impacted by the xylem anatomy differences between the two species and wet–dry season switch.
2. Materials and Methods
2.1. Site and Treatment Description
2.2. Sap Flux and Stomatal Conductance
2.3. Shoot Hydraulic Conductance
2.4. Environmental Factors
2.5. Data Analysis
3. Results
3.1. Effects of Fertilization on the Shoot Hydraulic Conductance
3.2. Sap Flux and Canopy Stomatal Conductance
3.3. Stomatal Sensitivity
4. Discussion
4.1. Nitrogen Deposition on the Whole-Tree Water Transport Capacity
4.2. Species Differences of the Nitrogen Effects
4.3. Influence of the Fertilization Dose on the Nitrogen Effects
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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JS-mean | JS-mid | |||||
---|---|---|---|---|---|---|
Source | df | F | Sig | df | F | Sig |
Corrected Model | 19 | 5.880 | 0.000 | 19 | 6.084 | 0.000 |
Seasons | 1 | 92.770 | 0.000 | 1 | 75.986 | 0.000 |
Species | 1 | 17.353 | 0.000 | 1 | 15.008 | 0.000 |
Treatments | 4 | 6.146 | 0.000 | 4 | 5.530 | 0.000 |
Seasons × Treatments | 4 | 1.216 | 0.304 | 4 | 1.330 | 0.258 |
Species × Treatments | 4 | 1.800 | 0.129 | 4 | 1.529 | 0.193 |
Seasons × Species | 1 | 0.036 | 0.849 | 1 | 0.037 | 0.847 |
Seasons × Species × Treatments | 4 | 1.823 | 0.124 | 4 | 1.959 | 0.100 |
GS-mean | GS-mid | |||||
---|---|---|---|---|---|---|
Source | df | F | Sig | df | F | Sig |
Corrected Model | 19 | 4.733 | 0.000 | 19 | 5.169 | 0.000 |
Seasons | 1 | 1.582 | 0.209 | 1 | 0.235 | 0.628 |
Species | 1 | 92.029 | 0.000 | 1 | 92.749 | 0.000 |
Treatments | 4 | 6.923 | 0.000 | 4 | 6.821 | 0.000 |
Seasons × Treatments | 4 | 2.599 | 0.036 | 4 | 3.127 | 0.015 |
Species × Treatments | 4 | 4.943 | 0.001 | 4 | 3.995 | 0.004 |
Seasons × Species | 1 | 0.051 | 0.822 | 1 | 0.358 | 0.550 |
Seasons × Species × Treatments | 4 | 1.742 | 0.140 | 4 | 1.838 | 0.121 |
Source | df | F | Sig |
---|---|---|---|
Corrected Model | 19 | 2.138 | 0.001 |
Seasons | 1 | 8.765 | 0.004 |
Species | 1 | 4.657 | 0.002 |
Treatments | 4 | 6.243 | 0.014 |
Seasons × Treatments | 4 | 0.540 | 0.707 |
Species × Treatments | 4 | 2.429 | 0.051 |
Seasons × Species | 1 | 0.183 | 0.670 |
Seasons × Species × Treatments | 4 | 0.566 | 0.688 |
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Zhao, Z.; Zhao, P.; Zhang, Z.; Ouyang, L.; Zhao, X.; Zhu, L.; Cao, C.; Zeng, L. Enhanced Isohydric Behavior Decoupled the Whole-Tree Sap Flux Response to Leaf Transpiration under Nitrogen Addition in a Subtropical Forest. Forests 2022, 13, 1847. https://doi.org/10.3390/f13111847
Zhao Z, Zhao P, Zhang Z, Ouyang L, Zhao X, Zhu L, Cao C, Zeng L. Enhanced Isohydric Behavior Decoupled the Whole-Tree Sap Flux Response to Leaf Transpiration under Nitrogen Addition in a Subtropical Forest. Forests. 2022; 13(11):1847. https://doi.org/10.3390/f13111847
Chicago/Turabian StyleZhao, Zhen, Ping Zhao, Zhenzhen Zhang, Lei Ouyang, Xiuhua Zhao, Liwei Zhu, Chenchen Cao, and Linhui Zeng. 2022. "Enhanced Isohydric Behavior Decoupled the Whole-Tree Sap Flux Response to Leaf Transpiration under Nitrogen Addition in a Subtropical Forest" Forests 13, no. 11: 1847. https://doi.org/10.3390/f13111847