摘要
定量分析植被覆盖时空特征及其与气候因素的关系,对精准把握半干旱区生态环境、生态文明建设和可持续发展具有重要意义。本研究基于MODIS-NDVI、气温、降水和数字高程模型等数据,采用趋势分析、回归分析以及偏相关分析法,研究了2000—2020年间锡林郭勒盟植被归一化植被指数(NDVI)的时空变化及其对气候的响应。结果表明:2000—2020年,锡林郭勒盟植被覆盖呈增加趋势,大致表现为稳定波动、快速增长和稳步增长3个变化阶段;锡林郭勒盟植被NDVI均值在空间上由西南向东北呈带状递增分布,并与高程和人口密度有较强的相关性;植被NDVI高值区主要集中在东部,且有明显增加趋势,低值区主要集中在西南部,且有局部退化现象;植被覆盖对气候变化响应的敏感度在空间和时间上各不相同,在空间变化上对气温较为敏感,在年际变化上对年均降水量较为敏感。锡林郭勒盟植被覆盖整体变好,但局部地区存在退化,应制定区域空间差异化、精准化的植被恢复和生态环境保护政策。
The quantitative analysis of spatio-temporal variations of vegetation cover and its correlation with climate are of great significance for understanding of ecological environment,ecological civilization construction,and sustainable development in semi-arid areas.We investigated the spatio-temporal variations of normalized difference vegetation index(NDVI)and its response to climate change during 2000-2020 in Xilin Gol,Inner Mongolia,by using trend analysis,regression analysis and partial correlation analysis based on the data of MODIS-NDVI,temperature,precipitation,digital elevation model.The results showed that vegetation cover in Xilin Gol had been increased from 2000 to 2020,which generally included three phases,i.e.,stable fluctuation,rapid growth,and steady growth.The mean NDVI showed a zonal increasing distribution from southwest to northeast,and had a strong correlation with elevation and population density in Xilin Gol region.The high values of NDVI were mainly in the east,with a significant increasing trend,and the low values were in the southwest,with a local degradation.The sensitivity of vegetation cover to climate change showed spatial and temporal variations.The spatial variation of vegetation was more sensitive to temperature and the interannual variation was sensitive to annual precipitation.In summary,vegetation cover improved overall in Xilin Gol,but there was degradation in some areas.We should formulate differentiated and precise vegetation restoration and ecological environmental protection policies.
作者
李京忠
辛振华
谢潇
薛冰
任婉侠
LI Jingzhong;XIN Zhenhua;XIE Xiao;XUE Bing;REN Wanxia(College of Urban and Environment Sciences,Xuchang University,Xuchang 461000,Henan,China;Liaoning Province Key Lab for Environmental Computation and Sustainability,Shenyang 110016,China;Weifang Institute of Modern Agriculture and Ecological Environment,Weifang 261199,Shandong,China;Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2024年第1期80-86,共7页
Chinese Journal of Applied Ecology
基金
辽宁省科技重大专项(E2431721G8)资助。
关键词
植被覆盖
偏相关分析
气候变化
相关性
vegetation cover
partial correlation analysis
climatic change
correlation
