[1]CHEN Mingxing,ZHANG Yuhu.Retrieval of Soil Moisture in Sanjiang Plain Based on TVDI Model with Four Vegetation Indices[J].Research of Soil and Water Conservation,2019,26(03):93-100,107.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 03
Page number:
93-100,107
Column:
Public date:
2019-04-12
- Title:
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Retrieval of Soil Moisture in Sanjiang Plain Based on TVDI Model with Four Vegetation Indices
- Author(s):
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CHEN Mingxing, ZHANG Yuhu
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College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China
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- Keywords:
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TVDI; vegetation Index; soil moisture; precipitation; Sanjiang Plain
- CLC:
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TP79
- DOI:
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- Abstract:
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The use of remote sensing to monitor soil moisture is conducive to the analysis of soil moisture conditions in large-scale areas. Comparing and analyzing the accuracy of the Temperature Vegetation Dryness Index (TVDI) calculated under different vegetation indices can increase the practical value of TVDI on retrieval of soil moisture. There are four vegetation indices, including NDVI (Normalized Difference Vegetation Index), EVI (Enhanced Vegetation Index), MSAVI (Modified Soil Adjusted Vegetation Index), RVI(Ratio Vegetation Index), were respectively used to construct LST-Ⅵ feature space and calculate TVDI by combining with land surface temperature data. The results indicated that:(1) all the TVDIs calculated by different vegetation indices presented the negative correlations with soil moisture data, that is, the higher the TVDI value, the lower the soil moisture value; (2) the values of R2 of regression analysis between soil moisture data and TVDI based on different vegetation indices were similar in May, June and September, and they were all suitable for retrieving soil moisture in these three periods; in July, compared to the TVDI results calculated by NDVI and RVI (R2 is around 0.15), TVDI based on EVI and MSAVI (R2 is around 0.35) was more suitable for retrieving soil moisture in this period; (3) from May to September, the drought mainly occurred in the central and southwest parts of the Sanjiang Plain, and the degree of drought was mainly mild drought. The eastern and northeastern parts remained basically normal or slightly humid in different periods.