干旱区地理2024，Vol.47Issue(11)：1887-1898,12.DOI:10.12118/j.issn.1000-6060.2023.719
黄土高原水分利用效率动态及其对干旱和地表温度的响应
Dynamics of water use efficiency and its response to drought and land surface temperature on the Loess Plateau
摘要
Abstract
The spatiotemporal variations of water use efficiency(WUE)and its relationship with drought and land surface temperature(LST)on the Loess Plateau are crucial for assessing the maximum vegetation carrying ca-pacity in this region,known as the most severely eroded area globally and the largest greening area in China.This study employed Theil-Sen trend analysis and the first-order differencing relative contribution method to examine the spatiotemporal changes in WUE across different seasons on the Loess Plateau from 2001 to 2021 and to evalu-ate the contributions of drought and LST to these changes.The results reveal that:(1)The average WUE values in spring and autumn are below 2.0 g C·m-2·mm-1,while in summer,the average WUE exceeds 2.0 g C·m-2·mm-1.In spring and autumn,WUE is higher in cultivated land and forest areas compared to grassland areas,whereas in sum-mer,WUE is lowest in cultivated land,followed by forest areas,and highest in grassland.(2)WUE remains stable in spring and summer,displaying a spatial distribution of"reduction in the central part,stability in the western and eastern parts."The rate of decline in WUE is greater in grassland areas than in forest and cultivated land areas.In autumn,WUE shows an increasing trend,with a higher rate of increase observed in grassland areas than in forest and cultivated land areas,exhibiting a spatial pattern of"increase in the northwest,decrease in the southeast."(3)In spring and summer,LST positively contributes to WUE changes,with the most significant impacts in grass-land areas.In autumn,LST negatively affects WUE in grassland and forest areas but positively influences WUE in cultivated land areas.Drought positively contributes to WUE changes in spring and autumn,while it negatively affects WUE in summer.These findings enhance the understanding of the interactions between drought,LST,and water resources in the context of climate change and ecological restoration efforts on the Loess Plateau.关键词
水分利用效率/干旱/地表温度/黄土高原Key words
water use efficiency/drought/land surface temperature/Loess Plateau引用本文复制引用
秦格霞,孟治元,李妮..黄土高原水分利用效率动态及其对干旱和地表温度的响应[J].干旱区地理,2024,47(11):1887-1898,12.基金项目
陕西省自然科学基础研究计划资助项目(2022JQ-274)资助 （2022JQ-274）
