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Forests 2014, 5(2), 287-308; doi:10.3390/f5020287

High NDVI and Potential Canopy Photosynthesis of South American Subtropical Forests despite Seasonal Changes in Leaf Area Index and Air Temperature

Laboratorio de Ecología Funcional, Departamento de Ecología Genética y Evolución, Instituto IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CABA, C1428EGA, Argentina
Laboratorio de Ecología Forestal y Ecofisiología, Instituto de Biología Subtropical-CONICET, FCF, Universidad Nacional de Misiones, Puerto Iguazú, Misiones, 3370, Argentina
Department of Biology, University of Miami, Miami, FL 33124, USA
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China
Author to whom correspondence should be addressed.
Received: 14 December 2013 / Revised: 16 February 2014 / Accepted: 17 February 2014 / Published: 20 February 2014
(This article belongs to the Special Issue Applications of Remote Sensing to Forestry)
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The canopy photosynthesis and carbon balance of the subtropical forests are not well studied compared to temperate and tropical forest ecosystems. The main objective of this study was to assess the seasonal dynamics of Normalized Difference Vegetation Index (NDVI) and potential canopy photosynthesis in relation to seasonal changes in leaf area index (LAI), chlorophyll concentration, and air temperatures of NE Argentina subtropical forests throughout the year. We included in the analysis several tree plantations (Pinus, Eucalyptus and Araucaria species) that are known to have high productivity. Field studies in native forests and tree plantations were conducted; stem growth rates, LAI and leaf chlorophyll concentration were measured. MODIS satellite-derived LAI (1 km SIN Grid) and NDVI (250m SIN Grid) from February 2000 to 2012 were used as a proxy of seasonal dynamics of potential photosynthetic activity at the stand level. The remote sensing LAI of the subtropical forests decreased every year from 6 to 5 during the cold season, similar to field LAI measurements, when temperatures were 10 °C lower than during the summer. The yearly maximum NDVI values were observed during a few months in autumn and spring (March through May and November, respectively) because high and low air temperatures may have a small detrimental effect on photosynthetic activity during both the warm and the cold seasons. Leaf chlorophyll concentration was higher during the cold season than the warm season which may have a compensatory effect on the seasonal variation of the NDVI values. The NDVI of the subtropical forest stands remained high and fairly constant throughout the year (the intra-annual coefficient of variation was 1.9%), and were comparable to the values of high-yield tree plantations. These results suggest that the humid subtropical forests in NE Argentina potentially could maintain high canopy photosynthetic activity throughout the year and thus this ecosystem may be a large carbon sink. View Full-Text
Keywords: canopy photosynthesis; ecosystem processes; growth rate; leaf chlorophyll; NDVI; remote sensing canopy photosynthesis; ecosystem processes; growth rate; leaf chlorophyll; NDVI; remote sensing

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Cristiano, P.M.; Madanes, N.; Campanello, P.I.; di Francescantonio, D.; Rodríguez, S.A.; Zhang, Y.-J.; Carrasco, L.O.; Goldstein, G. High NDVI and Potential Canopy Photosynthesis of South American Subtropical Forests despite Seasonal Changes in Leaf Area Index and Air Temperature. Forests 2014, 5, 287-308.

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