摘要
植被覆盖度是反映干旱半干旱地区植被生长状况的重要指标。以内蒙古锡林郭勒为研究区,利用趋势分析法对2000—2019年锡林郭勒的植被覆盖度时空变化进行研究,并基于10 km×10 km的格网,分别利用普通最小二乘法(ordinary least squares,OLS)和地理加权回归(geographical weighted regression,GWR)对其主导因素进行探究,结果表明:(1)时间序列上,锡林郭勒年均植被覆盖度(F_(VC))增长0.007,呈整体提高局部减少的变化特征;空间分布上,锡林郭勒F_(VC)东部局部减少,中部显著改善,西部相对稳定。(2)植被影响因素分析表明,降水、气温、人口对植被影响较大,空间聚集性较强,所占主导比例≥82.10%,主要表现为降水呈正主导,气温呈负主导,人口表现为双重作用且随时间的推移逐渐增强;高程、坡度、坡向、黏粒、砂粒对植被的影响较小,空间分布较为破碎,所占主导比例≤17.10%,其主导特征不显著。(3)采矿对植被存在不同程度的影响,矿区周边植被多年来改善不佳。(4)在探究锡林郭勒植被空间异质性方面,GWR较OLS表现出较好的优越性。
Fractional vegetation coverage(F_(VC))is an important indicator of vegetation growth in arid and semi-arid regions.Trend analysis was used to study the spatial-temporal change of F_(VC)in Xilingol of Inner Mongolia from 2000 to 2019,and ordinary least squares(OLS)and geographical weighted regression(GWR)were used,respectively,to explore the dominant factors of F_(VC)based on 10 km×10 km grid.The results show that the annual growth of F_(VC)was 0.007 and F_(VC)owned the characteristics of overall improvement but with some local reduction.Spatially,F_(VC)decreased in parts of the east,significantly improved in the middle and was relatively stable in the west.The influencing factors of vegetation show that precipitation,atmospheric temperature and population were the dominant factors of F_(VC)with strong spatial aggregation,and the dominant proportion accounted for≥82.10%.Specifically,precipitation was positively dominant.Temperature was negatively dominant.Population played a dual role,which gradually increased with the passage of time.The influences of elevation,slope gredient,slope aspect,sand,and clay on vegetation were not significant and with broken spatial aggregation.The dominant proportion accounted for only≤17.10%.Mining had various effects on vegetation and vegetation had not been improved significantly around the open mining areas.When exploring the causes of spatial heterogeneity of vegetation in Xilingol,GWR was better than OLS.The study on F_(VC)has certain theoretical and practical significance for arid and semi-arid areas in Xilingol,and the results are expected to provide scientific supports for the ecological management in local areas of Xilingol.
作者
李茂林
闫庆武
仲晓雅
朝鲁孟其其格
LI Mao-lin;YAN Qing-wu;ZHONG Xiao-ya;CHAO Lu-meng-qi-qi-ge(College of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;School of Public Policy and Management,China University of Mining and Technology,Xuzhou 221116,China;Inner Mongolia Grassland Survey Planning Institute,Hohhot 010051,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2021年第12期1548-1558,共11页
Journal of Ecology and Rural Environment
基金
内蒙古自治区科技计划项目(2060399-273)
国家自然科学基金(51874306)。
关键词
植被覆盖度
多重共线性检验
主导因素
地理加权回归
锡林郭勒
fractional vegetation coverage(FVC)
multicollinearity testing
dominant factors
geographically weighted regression
Xilingol
