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Long-term changes of soil fertility factors and their relationships with NDVI.

LI Yan-li1,2, PAN Xian-zhang1**, ZHOU Rui1,2, WANG Chang-kun1,2, LIU Ya1,2, SHI Rong-jie1,2, CHEN Dong-feng1, ZHAO Qi-guo1   

  1. (1 Key Laboratory of Soil Environment and Pollution, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-03-10 Published:2013-03-10

Abstract: Taking the Nanning and Chongzuo of Guangxi Province, South China as test areas, and by using the time-series NDVI of AVHRR and MODIS sensors and the soil data in 1981 and 2011, this paper analyzed the relationships between the normalized difference vegetation index (NDVI) and soil fertility factors, and the correlations between the longterm changes of the NDVI and soil fertility factors. In recent 30 years, the soil pH in test areas declined significantly, while the soil total nitrogen, available phosphorus, and available potassium contents had a significant increase. Meanwhile, the NDVI presented an overall slowincreasing trend, and the changes of the NDVI had significant positive relationships with those of the soil organic matter and total nitrogen, suggesting that the timeseries NDVI could be used to indicate the changes of soil organic matter and total nitrogen to some extent, and hence, provide a feasible method for monitoring the long-term change of soil fertility.