摘要
渭河流域水土流失问题严重,生态环境脆弱,探究其植被覆盖度时空变化及其驱动机理具有重要意义。文章基于MODIS13Q1数据产品,辅以同期自然环境及社会发展数据,采用趋势分析法、空间自相关分析及地理加权回归模型,揭示了2001-2020年县域尺度下渭河流域植被覆盖度的时空变化及驱动机理。结果表明:(1)渭河流域植被覆盖度总体呈现明显上升趋势,年均增长速率为2.04%,空间上呈现出由东南向西北先减后增再减的变动趋势;(2)渭河流域植被覆盖度改善面积占流域总面积的78.81%,等级转移主要发生在相邻等级之间,但跳级转移现象也普遍存在;(3)渭河流域92个县域植被覆盖度呈现出显著的全局空间自相关性,且以H-H空间正相关为主,表明县域间植被覆盖度的提升具有较好空间溢出效应;(4)气温、降水、坡度、日照等因素总体上促进渭河流域植被覆盖度提升,而城镇化率、人口规模以及经济发展水平等因素则显著抑制了植被覆盖度改善,因素影响性质及强度存在空间差异。研究结果可为因地制宜地提高植被覆盖度,综合治理渭河流域提供理论依据。
It is of great significance to explore the spatio-temporal changes of fractional vegetation cover(FVC)and the driving mechanism in the Weihe River Basin where soil erosion is serious and ecological environment is fragile.In this article,the trend analysis method,spatial auto-correlation analysis and geographical weighted regression model were used,with MODIS13Q1 data and the data of natural environment and social development in the same period,to reveal the spatio-temporal variation and driving mechanism of FVC in the River Basin on the county scale from 2001 to 2020.Findings of the studies revealed:FVC in the Weihe River Basin,as a whole,trended towards growing with an annual average growth rate of 2.04%;spatially,FVC of the River Basin from southeast to northwest decreased at first,then increased,and again decreased;The areas in which FVC had improved accounted for 78.81%of the total area of the Basin.The FVC grade shifts mainly occurred among the adjacent grades,however grade jump was ubiquitous;It appeared that FVC of 92 counties within the River Basin had notable global spatial auto-correlation,especially the H-H spatial positive correlation,which indicated that the improvement of FVC among the counties had a good spatial spillover effect;Temperature,precipitation,slope gradient and sunshine generally promoted the improvement of FVC in the River Basin,while urbanization rate,population size and economic development level significantly much more inhibited the improvement of FVC.There existed spatial differences in terms of the characters and intensity of these influential factors.It is expected that the result drawn from the study could provide a theoretical basis for improving FVC according to the local condition for comprehensively managing the Weihe River Basin.
作者
董洁芳
徐栋
张仲伍
张亮林
DONG Jiefang;XU Dong;ZHANG Zhongwu;ZHANG Lianglin(Yellow River Cultural and Ecological Research Institute,Yuncheng University,Yuncheng 044000,China;Department of Cultural and Tourism,Yuncheng University,Yuncheng 044000,China;State Key Lab of Remote Sensing Science,School of Geographical Sciences,Beijing Normal University,Beijing 100875,China;School of Geography Science,Shanxi Normal University,Taiyuan 030000,China;Central Natural Resources Engineering Technology(Hubei)Co.,Ltd,Wuhan 430070,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2023年第1期201-210,共10页
Environmental Science & Technology
基金
山西省高校哲学社会科学项目(2020W165)
国家社会科学基金项目(18BJY120)
山西省黄河文化生态研究院项目(HH202101)
运城学院旅游管理重点学科项目(XK-2021031)
关键词
植被覆盖度
时空分异
空间相关
地理加权回归
驱动机理
FVC
spatio-temporal variation
spatial correlation
geographically weighted regression
driving mechanism
