人类活动对山西省不同地表覆盖类型NDVI时空变化的影响

Influences of human activities on the spatiotemporal variations of NDVI in different land covers of Shanxi Province.

植被是影响生态环境质量的重要因子,阐明不同地表覆盖类型植被特征对人类活动的响应对制定有针对性的植被管理和恢复措施具有重要指导意义。本研究基于MOD13Q1数据,采用残差分析方法,分析了2000—2020年山西省不同地表覆盖类型人类活动对NDVI的影响。结果表明:山西省生长季NDVI最大值时空分布模式差异明显,呈现出由西北向东南逐渐增加的趋势,2000—2020年平均NDVI年增长率为0.0069;人类活动对山西省NDVI变化影响贡献率的方向和强度均呈现显著的时空差异,2000—2004年为负面影响,而2005年以后则转变为明显正向影响;2000—2020年人类活动对NDVI变化影响贡献率呈显著增加的趋势,年增长率为0.0055;人类活动对NDVI变化影响的趋势及显著程度存在空间差异,并呈现西高东低的趋势,其中产生正、负影响的区域面积分别占93.62%和6.38%;人类活动对农田、森林、草地NDVI的变化以积极影响为主,且影响的程度呈增加趋势,年均增长率分别为0.0065、0.0061和0.0047;人类活动对NDVI正负影响的均值表现为建设用地>农田>草地>森林。

Vegetation could affect the quality of ecological environment.Elucidating the responses of vegetation of different land cover types to human activities would be helpful for formulating targeted vegetation management and restoration strategies.Based on MOD13Q1 data,the influence of human activities on NDVI of different land cover types in Shanxi Province from 2000 to 2020 was analyzed by residual analysis method.The results showed that the maximum NDVI in the growing season presented significant spatial and temporal variations,increasing gradually from northwest to southeast.The average annual growth rate of NDVI during 2000-2020 was 0.0069.The attribute and intensity of human activities contributing to NDVI change in Shanxi Province showed significant temporal and spatial differences,with negative impacts from 2000 to 2004 and significant positive impacts after 2005.The contribution rate of human activities to the variations of NDVI during 2000-2020 showed a significant increasing trend,with an annual growth rate of 0.0055.There were spatial variations in the trend and significance of anthropogenic impacts on NDVI,with a higher trend in the west and a lower trend in the east.The positive impact and negative impact accounted for 93.62%and 6.38%,respectively.The impacts of human activities on NDVI changes in cropland,forest,and grassland were mainly positive,and showed increasing trend,with average annual growth rates of 0.0065,0.0061 and 0.0047,respectively.The average value of positive and negative impacts of human activities on NDVI of different land cover types followed a rank of construction area>cropland>grassland>forest.