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以广西南宁、崇左地区作为典型区,利用AVHRR和MODIS NDVI遥感影像数据,以及1981年、2011年的土壤数据,分析归一化差异植被指数(NDVI)与土壤肥力因子及其变化之间的相互关系。结果表明:近30年来,土壤pH极显著下降,全氮、速效磷、速效钾含量显著上升;同时,NDVI变化整体呈现缓慢上升趋势,且NDVI变化与土壤有机质变化及土壤全氮变化呈显著正相关。因此,NDVI时间序列数据能够在一定程度上反映土壤有机质和土壤全氮含量的变化,这为土壤肥力长期变化监测提供了一种可行的方法。
Taking Nanning and Chongzuo areas of Guangxi as typical areas, the AVHRR and MODIS NDVI remote sensing image data and the soil data of 1981 and 2011 were used to analyze the relationships between NDVI and soil fertility factors and their changes Interrelationship. The results showed that in the past 30 years, the soil pH decreased significantly, and the content of total nitrogen, available phosphorus and available potassium increased significantly. At the same time, the NDVI showed a slowly increasing trend, and the NDVI showed significant positive correlation with soil organic matter and soil total nitrogen Related. Therefore, NDVI time series data can reflect the changes of soil organic matter and total nitrogen content to a certain extent, which provides a feasible method for monitoring long-term changes of soil fertility.