摘要
岩溶区生态环境脆弱,石漠化问题突出,对植被覆盖进行动态监测并分析其影响因素具有重要意义。基于2001-2020年MODIS NDVI数据、气象站点的降水量和温度等数据,采用趋势分析法、Mann-kendall突变检验法和相关分析等方法,研究桂西北岩溶区植被NDVI时空变化特征,并分析植被NDVI变化与气候因子、地质背景条件和地形环境等的关系。结果表明,在年际和季节尺度上,植被NDVI时空变化趋势具有差异性,且出现多个突变点;降水量和气温对植被变化的影响具有差异性,且存在一定的滞后效应;地质背景、地形环境因素对植被NDVI变化具有重要影响。综上分析,揭示了桂西北岩溶区植被NDVI时空变化规律及其与气候因子、地质背景和地形环境因素的关系,研究结果可为岩溶区资源开发和生态环境保护提供参考。
The ecological environment in karst area is fragile and rocky desertification is a serious problem.It is of great significance to dynamically monitor vegetation coverage and analyze its influencing factors.The spatial and temporal variation characteristics of vegetation NDVI in the karst region of Northwest Guangxi are studied and the relationship between vegetation NDVI change and climatic factors,geological background conditions and topographic environment is analyzed by using the trend analysis,Mann-kendall mutation test and correlation analysis methods based on the MODIS NDVI data,precipitation and temperature data of meteorological stations from 2001 to 2020.The results show that:①on the interannual and seasonal scales,the spatiotemporal variation trends of vegetation NDVI are different,and there are several mutation points.②the effects of precipitation and temperature on vegetation change are different,and there is a certain lag effect.③the geological background and topographic environment factors have an important impact on the vegetation NDVI change.In conclusion,the temporal and spatial variation of vegetation NDVI and its relationship between climatic factors,geological background and topographic environmental factors are revealed.The research results can provide reference for resource exploitation and ecological environment protection in karst area.
作者
王永锋
张秋慧
靖娟利
WANG Yongfeng;ZHANG Qiuhui;JING Juanli(College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Spatial Information and Geomatics,Guilin 541004,China)
出处
《无线电工程》
北大核心
2021年第11期1303-1312,共10页
Radio Engineering
基金
国家自然科学基金资助项目(42161028,31801941)。
关键词
桂西北岩溶区
NDVI
Mann-kendall突变检验
趋势分析法
相关分析法
karst area of Northwest Guangxi
normalized difference vegetation index
Mann-kendall mutation test
trend analysis method
correlation analysis method
