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Response of vegetation to drought in the Tibetan Plateau: Elevation differentiation and the dominant factors
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2021-05-19 , DOI: 10.1016/j.agrformet.2021.108468
Yijia Wang , Bojie Fu , Yanxu Liu , Yan Li , Xiaoming Feng , Shuai Wang

With a typical alpine grassland ecosystem, the Tibetan Plateau (TP) is a highly representative region to observe the effects of climate change on ecosystems. Continued global warming has increased the drought risk of TP, yet the response of vegetation to drought remains unclear. To understand the spatial heterogeneity of the vegetation response to drought and identify the key control factors of vegetation response to drought in different elevation intervals on TP, we introduced three vegetation indexes (EVI, LAI, and GPP) and multi-scale drought indexes, including the Standardized Precipitation Index (SPI) and Standardized Precipitation–Evapotranspiration Index (SPEI), to determine the spatial response of vegetation growth to drought from 2000 to 2015. Land surface temperature (LST), land cover, snow cover, population density, and soil texture were selected as potential control factors. The mean values of the maximum correlation coefficients for the six combinations indicated that 14.3%/12.0% (SPI/SPEI) of the vegetation growth on TP was significantly affected by water conditions (p < 0.05). The extent of vegetation growth responses to drought were mainly influenced by LST with the highest contribution rate of 65.8% at 3000-4500 m intervals. The response time is mainly dependent on the proportion of grassland, with the highest contribution rate of 81.7% at 4500-6000 m intervals. The results provide reasonable evidence for understanding the spatial heterogeneity of the elevation dependence of the alpine ecosystem response to drought.



中文翻译:

青藏高原植被对干旱的响应:海拔分异及其主导因素

青藏高原(TP)具有典型的高山草原生态系统,是观察气候变化对生态系统影响的极具代表性的地区。持续的全球变暖增加了总磷的干旱风险,但植被对干旱的反应仍不清楚。为了了解植被对干旱的空间异质性并确定TP上不同海拔区间的植被对干旱的关键控制因素,我们引入了三种植被指数(EVI,LAI和GPP)和多尺度干旱指数,包括使用标准降水指数(SPI)和标准降水-蒸散指数(SPEI)来确定2000年至2015年植被生长对干旱的空间响应。地表温度(LST),土地覆盖,积雪,人口密度,选择土壤质地作为潜在控制因子。六个组合的最大相关系数的平均值表明,TP上的植被生长的14.3%/ 12.0%(SPI / SPEI)受水条件的影响显着(p <0.05)。植被生长对干旱的响应程度主要受LST影响,在3000-4500 m的间隔内,最高贡献率为65.8%。响应时间主要取决于草地的比例,在4500-6000 m的间隔内响应速度最高,为81.7%。这些结果为理解高山生态系统对干旱的海拔依赖性的空间异质性提供了合理的证据。六个组合的最大相关系数的平均值表明,TP上的植被生长的14.3%/ 12.0%(SPI / SPEI)受水条件的影响显着(p <0.05)。植被生长对干旱的响应程度主要受LST影响,在3000-4500 m的间隔内,最高贡献率为65.8%。响应时间主要取决于草地的比例,在4500-6000 m的间隔内响应速度最高,为81.7%。这些结果为理解高山生态系统对干旱的海拔依赖性的空间异质性提供了合理的证据。六个组合的最大相关系数的平均值表明,TP上的植被生长的14.3%/ 12.0%(SPI / SPEI)受水条件的影响显着(p <0.05)。植被生长对干旱的响应程度主要受LST影响,在3000-4500 m的间隔内,最高贡献率为65.8%。响应时间主要取决于草地的比例,在4500-6000 m的间隔内响应速度最高,为81.7%。这些结果为理解高山生态系统对干旱的海拔依赖性的空间异质性提供了合理的证据。植被生长对干旱的响应程度主要受LST影响,在3000-4500 m的间隔内,最高贡献率为65.8%。响应时间主要取决于草地的比例,在4500-6000 m的间隔内响应速度最高,为81.7%。这些结果为理解高山生态系统对干旱的海拔依赖性的空间异质性提供了合理的证据。植被生长对干旱的响应程度主要受LST影响,在3000-4500 m的间隔内,最高贡献率为65.8%。响应时间主要取决于草地的比例,在4500-6000 m的间隔内响应速度最高,为81.7%。这些结果为理解高山生态系统对干旱的海拔依赖性的空间异质性提供了合理的证据。

更新日期:2021-05-20
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