Interdependent Dynamics of LAI-Albedo across the Roofing Landscapes: Mongolian and Tibetan Plateaus

文献类型： 外文期刊

第一作者： Tian, Li

作者： Tian, Li;Chen, Jiquan;Chen, Jiquan;Shao, Changliang;Shao, Changliang

作者机构：

关键词： albedo; leaf area index (LAI); alpine; Eurasian continent; altitude and latitude; energy balance; global warming; land surface process

期刊名称：REMOTE SENSING （ 影响因子：4.848； 五年影响因子：5.353 ）

ISSN： 2072-4292

年卷期： 2018 年 10 卷 7 期

页码：

收录情况： SCI

摘要： The Mongolian Plateau (MP) and Tibetan Plateau (TP) have experienced higher-than-global average warming in recent decades, resulting in many significant changes in ecosystem structure and function. Among them are the leaf area index (LAI) and albedo, which play a fundamental role in understanding many causes and consequences of land surface processes and climate. Here, we focused on the spatiotemporal changes of LAI, albedo, and their spatiotemporal relationships on the two roofing landscapes in Eurasia. Based on the MODIS products, we investigated the spatiotemporal changes of albedo((VIS, NIR and SHO)) and LAI from 2000 through 2016. We found that there existed a general negative logarithmic relationship between LAI and three measures of albedo on both plateaus. No significant relationship was found for LAI-albedo(NIR) on the TP, due to more complex land surface canopy characteristics affected by the NIR reflection there. During 2000-2016, overall, annual mean LAI increased significantly by 119.40 x 10(3) km(2) on the MP and by 28.35 x 10(3) km(2) on the TP, while the decreased areas for annual mean albedo(VIS) were 585.59 x 10(3) km(2) and 235.73 x 10(3) km(2) on the MP and TP, respectively. More importantly, the LAI-albedo relationships varied substantially across the space and over time, with mismatches found in some parts of the landscapes. Substantial additional efforts with observational and/or experimental investigations are needed to explore the underlying mechanisms responsible for these relationships, including the influences of vegetation characteristics and disturbances.

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