数字农科院2.0

Changes in albedo and its radiative forcing of grasslands in East Asia drylands

文献类型： 外文期刊

作者： Qingsong Zhu;Jiquan Chen;Liangxu Wu;Yuting Huang;Changliang Shao;Gang Dong;Zhe Xu;Xianglan Li

作者机构：

关键词： Albedo;Disturbance;Global warming potential;Grassland

期刊名称： Ecological Processes

ISSN： 2192-1709

年卷期： 2024 年 13 卷 1 期

页码：

收录情况： SCIE（2024版） ; ; EI（2024版） ; ; 科技核心（2024版）

摘要： Background: Grasslands in drylands are increasingly influenced by human activities and climate change, leading to alterations in albedo and radiative energy balance among others. Surface biophysical properties and their interactions change greatly following disturbances. However, our understanding of these processes and their climatic impacts remains limited. In this study, we used multi-year observations from satellites and eddy-covariance towers to investigate the response of albedo to variables closely associated with human disturbances, including vegetation greenness (EVI) and surface soil volumetric water content (VWC), as well as snow cover and clearness index (Ta) for their potential relationships. Results: EVI and VWC during the growing season were the primary factors influencing albedo. EVI and VWC were negatively correlated with albedo, with VWC’s total direct and indirect impacts being slightly smaller than those of EVI. During the non-growing season, snow cover was the most influential factor on albedo. VWC and Ta negatively affected albedo throughout the year. We estimated the impact of variations in EVI and VWC on climate to be in the range of 0.004 to 0.113 kg CO2 m−2 yr−1 in CO2 equivalent. Conclusions: This study indicates the significant impacts of climate change and human disturbances on vulnerable grassland ecosystems from the perspective of altered albedo. Changes in vegetation greenness and soil properties induced by climate change and human activities may have a substantial impact on albedo, which in turn feedback on climate change, indicating that future climate policies should take this factor into consideration.

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