水土保持研究2025，Vol.32Issue(3)：159-169,11.DOI:10.13869/j.cnki.rswc.2025.03.009
黄土高原植被水分利用效率时空变化及其对不同影响因子的响应强度
Spatiotemporal variation of vegetation water use efficiency on the Loess Plateau and its response intensity to different influencing factors
摘要
Abstract
[Objective]This study analyzes the spatiotemporal variation characteristics of vegetation water use efficiency(WUE)and its response intensity to influencing factors on the entire Loess Plateau of China and its sub-regions.The aim is to explore its changing patterns and underlying mechanisms to provide theoretical support for vegetation management and ecological improvement on the Loess Plateau.[Methods]The Loess Plateau of China was selected as the study area.Based on MODIS remote sensing data and daily meteorological monitoring data from 2001 to 2020,this study used linear regression models,Theil-Sen Median trend analysis,multiple linear regression,and other methods to analyze the spatiotemporal variation characteristics of vegetation WUE and its response intensity to influencing factors on the Loess Plateau.[Results](1)From 2001 to 2020,the vegetation WUE of the Loess Plateau showed no significant decreasing trend,among which the semi-humid region showed a significant decreasing trend with a decrease rate of 0.008 gC/(m2·mm·a)(p<0.05),and the humid region showed a significant increasing trend with an increase rate of 0.027 gC/(m2·mm·a)(p<0.05).(2)From 2001 to 2020,the spatial variation of vegetation WUE on the Loess Plateau was mainly decreasing,with 18.56%of the area showing a significant decreasing trend,mainly distributed in arid and semi-humid regions.Only 3.23%of the areas showed a significant increasing trend,concentrated in the humid region.(3)From 2001 to 2020,the response intensity of vegetation WUE to the annual average wind speed and annual average leaf area index on the Loess Plateau showed a significant decreasing trend(p<0.05).However,the response intensity of vegetation WUE to the annual average leaf area index in semi-arid and humid regions showed a significant increasing trend(p<0.05).[Conclusion]From 2001 to 2020,the vegetation WUE of the Loess Plateau showed a decreasing trend,except in the humid region.Its response intensity to the leaf area index showed a significant decreasing trend in the arid and semi-humid regions.The study suggests that optimizing vegetation canopy structure or type in arid and semi-humid regions plays an important role in improving vegetation WUE.关键词
水分利用效率/变化趋势/响应强度/黄土高原Key words
water use efficiency/variation trends/response intensity/Loess Plateau分类
天文与地球科学引用本文复制引用
杨梅焕,王添晴,李扬,苏立红,闫伟伟,王涛,李卓阳,李雅雯,童海涛..黄土高原植被水分利用效率时空变化及其对不同影响因子的响应强度[J].水土保持研究,2025,32(3):159-169,11.基金项目
国家重点研发计划(2022YFE0119200) （2022YFE0119200）
国家自然科学基金(42271309,41501571) （42271309,41501571）
2025年度陕西省哲学社会科学研究专项(2025YB0239) （2025YB0239）
