Spatial and temporal variation features of NDVI and its influence factors in the Xin'an River Basin from 2000 to 2021
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摘要: 新安江流域是长三角地区重要的生态屏障,对该流域的植被覆盖情况进行监测并掌握其动态变化特征,对该区生态环境保护具有重要意义。以新安江流域为研究区,利用2000—2021年MOD13Q1数据,针对归一化植被指数(NDVI)的时空变化特征及其变化的持续性,使用Theil-Sen Median趋势分析、Mann-Kendall检验和Hurst指数等方法进行分析,探讨了NDVI的变化趋势与岩性建造、土地利用类型之间的关系。结果表明:二十多年以来,新安江流域的年平均NDVI为0.5~0.9,总体呈波动上升趋势,最大值出现在每年7—9月,最小值出现在每年1—3月,呈现"山地高,丘陵和平原较低"的分布特征。NDVI变化类型以改善型为主,改善型区域面积占比>70％,且以持续改善型为主,其中轻微改善型和明显改善型面积占比达85.71％。第四系和白垩纪红层分布区,NDVI严重退化和轻微退化占比较高,NDVI退化情况较严重的土地利用类型为建设用地、草地和耕地。该研究结果可反映新安江流域NDVI的时空变化特征,对于该区生态环境保护与建设具有一定指导意义。Abstract: As a pivotal ecological safeguard in the Yangtze River Delta, the Xin'an River Basin necessitates rigorous surveillance over its vegetation coverage to fully comprehend its shifting characteristics, which is of great significance to the local ecological environment protection. Taking Xin'an River Basin as a case, our study adopts MOD13Q1 data from 2000 to 2021 to unveil the spatial-temporal variability of the Normalized Difference Vegetation Index (NDVI) and its persistence of the change through the application of Theil-Sen Median trend analysis, the Mann-Kendall test and Hurst. Furthermore, the study decodes the relationship between NDVI trends, lithology construction, and diverse land usage types. The findings illustrated that the average annual NDVI within the Xin'an River Basin spanned from 0.5 to 0.9 for over two decades, exhibiting a generally upward ebb and flow trend. The pinnacle was recorded during July to September, while the low ebb occurred from January to March, reflecting a distinct "high in mountains, low in hills and plains" distribution characteristics. The NDVI changes are dominated by improvement type, especially the continuous improvement, accounting for over 70％ of the local area, among which 85.71％ of the area were slightly and significantly improved. Upon investigation of the Quaternary and Cretaceous red layer distributed area, the study found a higher proportion of substantial and slight NDVI degradation. Land types suffering pronounced NDVI degradation were construction land, grassland, and cropland, respectively. The conclusions drawn from our research elucidate the spatial-temporal NDVI fluctuations in the Xin'an River Basin, bearing substantial implications for ecological preservation and development in the region.
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Key words:
- Xin'an River Basin /
- spatial and temporal variation /
- NDVI /
- trend analysis /
- vegetation cover
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