川西高原植被NDVI变化研究

Study on NDVI Changes of Vegetation in Western Sichuan Plateau

【目的】为较全面掌握川西高原植被NDVI动态变化及驱动因素。【方法】以MODIS-NDVI为基础数据,借助Sen+MK和地理探测器模型对其2000—2020年变化规律展开探讨。【结果】①川西高原植被NDVI整体呈现自西南向东北方向倾斜,植被NDVI数值整体相对更高;②近20年,全域植被NDVI数值无显著变化趋势的地区全域面积占比约75%;③高程、年平均气温和土壤类型主导了川西高原植被NDVI的空间布局,解释力在35%以上。【结论】川西高原近20年植被整体生长状态良好,自然因素对其植被空间布局的影响显著。

[Purposes]This paper aims to comprehensively understand the NDVI dynamic changes and driving factors of vegetation in the western Sichuan plateau.[Methods]This study conducted a discussion on its change rules from 2000 to 2020 based on MODIS-NDVI data,using Sen+MK and geographic detector models.[Findings]The results are as follows:①The NDVI values of vegetation on the western Sichuan plateau as a whole show a slope from southwest to northeast,and the NDVI values of vegetation are relatively higher as a whole;②In the past 20 years,the area with no significant change trend in NDVI values of vegetation throughout the region accounts for about 75%;③Elevation,annual average temperature,and soil type are the dominant factors affecting the NDVI spatial layout of vegetation in the study area,with an explanatory power of over 35%.[Conclusions]The overall growth of vegetation on the western Sichuan plateau in the past 20 years is good,and natural factors have a significant impact on its spatial layout of vegetation.