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近40年青海省草地植被时空变化及其与人类活动的关系 被引量:7

Spatiotemporal variation of grassland vegetation and its relationship with human activities in Qinghai Province in recent 40 years
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摘要 基于Landsat 8 OLI、GIMMS NDVI 3G数据、MODIS数据及相关统计数据,采用趋势分析法、相关分析法以及地理加权回归法,分析了1982—2018年青海省草地植被时空变化及其对人类活动的响应。结果表明:(1)1982—2018年青海省草地NDVImax总体呈减少趋势,年均减少速率为1.2×10^(-4)。(2)从空间分布特征看,西南部和中部草地NDVImax对放牧强度响应程度明显,而东北部草地NDVImax对放牧强度的响应不明显,这可能与农业和牧业互补优势明显及生态工程实施有关。(3)从扰动要素看,人均GDP、交通、居民点以及总人口与草地NDVImax的局部回归系数分别为0.20、0.11、0.04和0.03。其中,人均GDP与草地NDVImax的局部回归系数呈西部高、东部低的分布格局,其他呈现东西部高、中部低的空间格局,主要是由于西部拥有丰富的矿产资源,东部是交通枢纽和人口聚集区。 We analyzed the temporal and spatial changes of grassland vegetation cover and its response to human activities in Qinghai Province by trend analysis method,linear correlation analysis,and geographical weighted regression method,based on Landsat 8 OLI,GIMMS NDVI 3 G data,MODIS data and statistical data from 1982 to 2018.The results showed that:(1)From1982 to 2018,NDVImax of grassland in Qinghai Province showed an overall decreasing trend,with an average rate of 1.2×10^(-4).(2)The NDVImaxwas sensitive to grazing intensity in the southwest and central parts of Qinghai Province,while it was not sensitive in the northeast.This may be related to the complementary advantages of agriculture and animal husbandry and the implementation of ecological engineering.(3)The regression coefficients between NDVImaxand per capita GDP,traffic,residential area,and total human population were 0.20,0.11,0.04 and 0.03,respectively.The local regression coefficients of per capita GDP and grassland NDVImaxwere high in the west and low in the east,while that for other regression relationships were high in the west and east and low in the east region.This is mainly due to the rich mineral resources in the west and a transportation hub and population gathering area in the east.
作者 魏晓旭 魏伟 刘春芳 WEI Xiao-xu;WEI Wei;LIU Chun-fang(College of Social Development and Public Administration,Northwest Normal University,Lanzhou 730000,China;College of Geographical and Environmental Science,Northwest formal University,Lanzhou 730000,China;Gansu Engineering Research Center of Uind Utilization and Comprehension Consolidation,Lanzhou 730070,China)
出处 《生态学杂志》 CAS CSCD 北大核心 2021年第8期2541-2552,共12页 Chinese Journal of Ecology
基金 西北师范大学青年教师科研能力提升计划项目(NWNU-SKQN2019-40)资助。
关键词 NDVImax 趋势 人类活动 空间格局 NDVImax trend human activity spatial pattern
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