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Regional-scale vegetation-climate interactions on the Qinghai-Tibet Plateau
Ecological Informatics ( IF 5.1 ) Pub Date : 2021-08-27 , DOI: 10.1016/j.ecoinf.2021.101413
Chan Diao 1, 2, 3, 4 , Yu Liu 1, 5 , Liang Zhao 6, 7 , Ga Zhuo 8 , Yongqing Zhang 4
Affiliation  

Response and feedback of vegetation growth to climate change are a series biogeophysical processes from local to regional scales. Revealing the vegetation-climate interaction is fundamental to understand the evolution of earth surface system in the context of global climate change. Due to the low temperature and vulnerable biotic and abiotic settings, the alpine ecosystems are sensitive to climate change, peculiarly in the Qinghai-Tibet Plateau (QTP). By combining the climate factors (precipitation and temperature) and vegetation state indicated by the Enhanced Vegetation Index (EVI) data we try to reveal the pertinent temporal reaction mode of vegetation to climate change on the QTP. The vegetation-climate interactions were investigated by using the Granger causality test technique. The prime findings of this study are: (1) vegetation showed a strong sensitivity to warming-wetting climate in most arid and semi-arid areas of the QTP; (2) the reaction patterns of EVI to precipitation show a temporal lag of 0–1 months, which was strongest to the cumulative precipitation within 1–2 months; (3) The time lag effect and cumulative effect of temperature on vegetation both occurred within 1 to 2 months; (4) The unidirectional Granger causes of precipitation and temperature to vegetation accounted for 17.65% and 8.66% of the entire QTP, respectively. This study emphasizes a sensitive response of the vegetation to climate change (precipitation and temperature) in the QTP. Vegetation feedback makes the fluctuations and effects of climate more complicated. The results indicated that more insights into the future forecasting of climate change and vegetation dynamics can be acquired by a specific and comprehensive analysis of vegetation-climate coupled feedback.



中文翻译:

青藏高原区域尺度植被-气候相互作用

植被生长对气候变化的响应和反馈是从局部到区域尺度的一系列生物地球物理过程。揭示植被-气候相互作用是理解全球气候变化背景下地表系统演化的基础。由于低温和脆弱的生物和非生物环境,高山生态系统对气候变化很敏感,特别是在青藏高原(QTP)。通过结合增强型植被指数(EVI)数据指示的气候因子(降水和温度)和植被状态,我们试图揭示青藏高原植被对气候变化的相关时间反应模式。使用格兰杰因果检验技术研究植被-气候相互作用。这项研究的主要发现是:(1) 青藏高原大部分干旱半干旱区植被对暖湿气候具有较强的敏感性;(2) EVI对降水的反应模式表现出0-1个月的时间滞后,其中以1-2个月的累积降水最为强烈;(3)温度对植被的时滞效应和累积效应均发生在1~2个月内;(4)降水和气温对植被的单向格兰杰成因分别占整个青藏高原的17.65%和8.66%。本研究强调了青藏高原植被对气候变化(降水和温度)的敏感反应。植被反馈使气候的波动和影响更加复杂。

更新日期:2021-09-03
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