山水林田湖草生态保护修复工程第一批试点区NDVI时空分布与影响因素分析

Spatio-Temporal Distribution and Influencing Factors of NDVI in the First Batch of Pilot Areas of Ecological Protection and Restoration Project of Mountain-RiverForest-Farmland-Lake-Grass

文章采用MODIS NDVI 2005-2014年数据,应用GIS像元统计、空间叠加等分析工具,并结合均值法、最大值合成法、一元线性回归和变异系数法,分析了山水林田湖草生态保护修复工程第一批试点区近10年NDVI时空变化分布特征、波动状况和影响因素。结果显示,试点区NDVI均呈现出缓慢增加趋势,年际NDVI值最大值、最小值出现的月份不同,NDVI值波动较大(变异系数值高)的地区主要分布在居民点附近及低坡度地区,同时该区域也是试点区NDVI低值集中区。结论说明山水林田湖草生态保护修复工程第一批试点涉及的4个区域NDVI时空变化、波动因素有相同之处,也各有差异;人类活动对NDVI时空变化影响较大。

This paper uses MODIS NDVI 2005-2014 data, applies GIS pixel statistics, spatial superposition and other analysis tools, and combines the mean method, maximum value synthesis method, linear regression and coefficient of variation method to analyze the distribution characteristics, fluctuations and influencing factors of NDVI spatial and temporal changes in the first batch of pilot areas of ecological restoration of multi-ecological elements. The results show that: NDVI in the pilot area showed a slow increasing trend;The month in which the maximum and minimum values of the NDVI value appear are different;The areas where the NDVI value of the pilot area fluctuated greatly (the coefficient of variation value was high) were mainly distributed near the residential area and the low slope area, and the area was also the low concentration area of NDVI. According to the study, the NDVI spatial and temporal changes and fluctuation factors in the four pilot areas have similarities and differences, and human activities have a greater impact on the spatial and temporal changes of NDVI.