Continuous warming shift greening towards browning in the Southeast and Northwest High Mountain Asia.
Continuous warming shift greening towards browning in the Southeast and Northwest High Mountain Asia.
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DOI：
10.1038/s41598-021-97240-4
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发表时间：
2021-09-09
影响因子：
4.6
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Liu Y;Li Z;Chen Y
遥感和地面植被观测数据显示，气候变暖促进了全球植被绿化，亚洲高山地区（HMA）气温升高幅度是全球平均水平的两倍以上。在如此剧烈的气候变暖下，HMA的植被动态发生了怎样的变化？在这项研究中，我们使用1982年至2015年的归一化植被指数（NDVI）来评估HMA植被动态的最新变化及其气候驱动机制。结果显示，在过去30年中，HMA总体上遵循“暖湿”趋势，温度持续上升。1982-1998年期间，降水量增加（1.16 mm yr−1），但自1998年以来出现逆转（-2.73 mm yr−1）。与此同时，1998年之前，HMA的NDVI增加（每十年0.012），之后趋势逆转并下降（每十年-0.005）。暖化和降水变化的双重作用是造成HMA植被布朗宁的主要原因。如前所述，HMA的气温上升超过了全球平均水平。全球气候变暖引起的水汽压亏缺增加，加速了地表水的损失和消耗，也加剧了土壤水分亏缺。也就是说，陆地蒸散量的异常增加远远超过降水量，区域性缺水加剧。气候变化是驱动这些植被和水动力的主要因素，所占比例最大，达到41.9%。
Remote sensing and ground vegetation observation data show that climate warming promotes global vegetation greening, and the increase in air temperature in High Mountain Asia (HMA) is more than twice the global average. Under such a drastic warming in climate, how have the vegetation dynamics in HMA changed? In this study, we use the Normalized Difference Vegetation Index (NDVI) from 1982 to 2015 to evaluate the latest changes in vegetation dynamics in HMA and their climate-driving mechanisms. The results show that over the past 30 years, HMA has generally followed a “warm-wet” trend, with temperatures charting a continuous rise. During 1982–1998 precipitation increased (1.16 mm yr−1), but depicted to reverse since 1998 (− 2.73 mm yr−1). Meanwhile, the NDVI in HMA increased (0.012 per decade) prior to 1998, after which the trend reversed and declined (− 0.005 per decade). The main reason for the browning of HMA vegetation is the dual effects of warming and precipitation changes. As mentioned, the increase in air temperature in HMA exceeds the global average. The increase of water vapor pressure deficit caused by global warming accelerates the loss and consumption of surface water, and also aggravates the soil water deficit. That is to say, the abnormal increase of land evapotranspiration far exceeds the precipitation, and the regional water shortage increases. Climate change is the primary factor driving these vegetation and water dynamics, with the largest proportion reaching 41.9%.
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