干旱区地理2024，Vol.47Issue(10)：1735-1744,10.DOI:10.12118/j.issn.1000-6060.2024.036
石羊河流域归一化植被指数变化及其驱动因子分析
Normalized difference vegetation index change and its driving factors in Shiyang River Basin
摘要
Abstract
The problem of land desertification is serious,and,in this regard,the ecological environment has shown great frailty in Shiyang River Basin,Gansu Province,China.Studying the driving factors of vegetation cover is thus of great significance for ecological environment protection in the river basin.Using monthly NASA GIMMS normalized difference vegetation index(NDVI),temperature,precipitation,sunshine,and evaporation data in Shiyang River Basin from 2000 to 2020,change characteristics and driving factors of NDVI were ana-lyzed using trend slopes,cumulative distances and signal-to-noise ratios,correlation coefficients,and multiple re-gressions.The results were as follows:(1)The spatial distribution of NDVI in Shiyang River Basin followed the trend of upper reaches>whole river basin>middle reaches>lower reaches because of the influence of altitude,landform,and climate difference.(2)The annual NDVI showed an obviously increasing trend in the whole river basin and its upper and middle reaches,and a slightly increasing trend in the lower reaches.The slope trend fol-lowed upper reaches>whole river basin>middle reaches>lower reaches.The NDVI of four seasons also showed growth trends,with the slope trend being summer>autumn>winter>spring,with summer,autumn,and winter basi-cally having significant growth.A mutation of the NDVI of whole river basin and its upper,middle,and lower reaches occurred in 2010 or 2011.(3)The climate factors that affected the NDVI change were precipitation,tem-perature,evaporation,and sunshine hours.In turn,temperature,precipitation,and evaporation positively contrib-uted to NDVI,whereas sunshine duration had a negative contribution to NDVI.NDVI change was a result of combined climate change and human activities in Shiyang River Basin.The contribution of climate factors to ND-VI was greater than that of human activities in the whole river basin and its upper reaches,whereas the contribu-tions of climate factors and human activities to NDVI were equal in the middle and lower reaches.The contribu-tion rate of human activities increased significantly after mutation,whereas the contribution rate of climate fac-tors was relatively weakened.This study provides a scientific basis for vegetation restoration and ecological envi-ronment protection in Shiyang River Basin.关键词
NDVI/趋势斜率/驱动因子/多元回归/石羊河流域Key words
NDVI/trend slope/driving factor/multiple regression/Shiyang River Basin引用本文复制引用
杨晓玲,丁文魁,周华,李岩瑛,陈海贝..石羊河流域归一化植被指数变化及其驱动因子分析[J].干旱区地理,2024,47(10):1735-1744,10.基金项目
国家自然科学基金(41975015,41775107,42175192) （41975015,41775107,42175192）
甘肃省气象局气象科研项目(人才专项)(GSMArc2019-02)资助 （人才专项）
