Optimal temperature of vegetation productivity and its linkage with climate and elevation on the Tibetan Plateau

作者：Anping Chen, Ling Huang, Qiang Liu, Shilong Piao · 发表于：Global Change Biology · 年份：2021 · DOI：10.1111/gcb.15542 · 被引用次数：120 · 研究领域：Remote Sensing in Agriculture、Plant Water Relations and Carbon Dynamics、Species Distribution and Climate Change

Abstract Vegetation productivity first increases and then decreases with temperature; and temperature corresponding to the maximum productivity is called optimal temperature ( T opt ). In this study, we used satellite derived near‐infrared reflectance of vegetation ( NIR v ) data to map T opt of vegetation productivity at the spatial resolution of 0.1° on the Tibetan Plateau (TP), one of most sensitive regions in the climate system. The average T opt of non‐forest vegetation on the TP is about 14.7°C, significantly lower than the T opt value used in current ecosystem models. A remarkable geographical heterogeneity in T opt is observed over the TP. Higher T opt values generally appear in the north‐eastern TP, while the south‐western TP has relatively lower T opt (<10°C), in line with the difference of climate conditions and topography across different regions. Spatially, T opt tends to decrease by 0.41°C per 100 m increase in elevation, faster than the elevational elapse rate of growing season temperature, implying a potential CO 2 regulation of T opt in addition to temperature acclimation. T opt increases by 0.66°C for each 1°C of rising mean annual temperature as a result of vegetation acclimation to climate change. However, at least at the decadal scale, there is no significant change in T opt between 2000s and 2010s, suggesting that the T opt climate acclimation may not keep up with the warming rate. Finally, future (2091–2100) warming could be close to and even surpass...