Divergent response of seasonally dry tropical vegetation to climatic variations in dry and wet seasons

Global Change Biology
Xuhui WangDan Zhu

Abstract

Interannual variations of photosynthesis in tropical seasonally dry vegetation are one of the dominant drivers to interannual variations of atmospheric CO2 growth rate. Yet, the seasonal differences in the response of photosynthesis to climate variations in these ecosystems remain poorly understood. Here using Normalized Difference Vegetation Index (NDVI), we explored the response of photosynthesis of seasonally dry tropical vegetation to climatic variations in the dry and the wet seasons during the past three decades. We found significant (p < 0.01) differences between dry and wet seasons in the interannual response of photosynthesis to temperature (γint ) and to precipitation (δint ). γint is ~1% °C-1 more negative and δint is ~8% 100 mm-1 more positive in the dry season than in the wet season. Further analyses show that the seasonal difference in γint can be explained by background moisture and temperature conditions. Positive γint occurred in wet season where mean temperature is lower than 27°C and precipitation is at least 60 mm larger than potential evapotranspiration. Two widely used Gross Primary Productivity (GPP) estimates (empirical modeling by machine-learning algorithm applied to flux tower measurements, and nine p...Continue Reading

References

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Sep 20, 2017·Proceedings of the National Academy of Sciences of the United States of America·Ying FanCarlos Otero-Casal

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Citations

Nov 2, 2019·Global Change Biology·Shilong PiaoStephen Sitch

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