水土保持研究2024，Vol.31Issue(5)：327-336,343,11.DOI:10.13869/j.cnki.rswc.2024.05.004
2000-2020年青海湖流域植被净初级生产力时空格局及驱动分析
Spatiotemporal Patterns of Vegetation Net Primary Productivity and Their Drivers in Qinghai Lake Basin from 2000 to 2020
摘要
Abstract
[Objective]The primary objective of this study is to investigate the spatiotemporal variations in net primary productivity(NPP)of vegetation within Qinghai Lake Basin from 2000 to 2020.Additionally,it aims to reveal the key factors and their contributive driver of changes in vegetation NPP.The research is designed to provide a baseline scientific investigation on dynamics of NPP within Qinghai Lake Basin.[Methods]We used data on vegetation NPP,temperature,precipitation,fractional vegetation cover and human activity intensity in Qinghai Lake Basin from 2000 to 2020 to analyze the spatiotemporal changes of vegetation NPP across sub-basins,elevations,and micro-terrain in Qinghai Lake Basin.We applied spatial analysis of ArcGIS,geographic detector model to conduct these analyses.Furthermore,We also investigated the correlations of vegetation NPP with temperature,precipitation,and fractional vegetation cover,as well as the driving factors of vegetation NPP.[Results](1)In the past 21 years,the annual vegetation NPP in the Qinghai Lake Basin exhibited fluctuating increase across temporal scale,with a growth rate of 2.22 g C·m2/a,and spatially increased trend from northwest to southeast.(2)The study also revealed spatially significant correlations between annual vegetation NPP and mean annual temperature,annual precipitation,and annual fractional vegetation cover,with the ratios 40％,9％and 59％,respectively.The primary partial correlation coefficients between mean annual temperature and annual precipitation with annual vegetation NPP encompassed 59.26％and 33.39％of the basin area.(3)The results of our study also revealed that temperature(q=0.58),elevations(q=0.54)and human activity intensity(q=0.38)were principal drivers of basin-scale NPP,also,interactive impact of factors were found to better explain these drives than any of single factor.[Conclusion]The NPP of vegetation in Qinghai Lake Basin increased over temporal scales from 2000 to 2020.Our study showed spatially significant differences in NPP across elevation,subwatershed and microtopographic pattern.The interactions of temperature,altitude and human activities were the main driving factors of NPP in the Qinghai Lake Basin.关键词
青海湖流域/植被净初级生产力/时空格局/地理探测器Key words
Qinghai Lake Basin/NPP/spatiotemporal patterns/geographic detector分类
农业科技引用本文复制引用
李文斌,曹生奎,曹广超,赵浩然,陈链璇,侯瑶芳..2000-2020年青海湖流域植被净初级生产力时空格局及驱动分析[J].水土保持研究,2024,31(5):327-336,343,11.基金项目
国家自然科学基金"青海湖流域高寒湿地生态系统碳水收支变异特征及尺度扩展研究"(42061008) （42061008）
