Estimating soil moisture using Temperature-Vegetation Dryness Index (TVDI) in the Huang-huai-hai (HHH) plain

被引:75
作者
Chen, Jian [1 ,2 ]
Wang, Chunzhi [3 ]
Jiang, Hong [1 ,2 ,4 ]
Mao, Liuxi [3 ]
Yu, Zhenrong [5 ]
机构
[1] Zhejiang Agr & Forestry Univ, State Key Lab Subtrop Forest Sci, Hangzhou, Zhejiang, Peoples R China
[2] Zhejiang Agr & Forestry Univ, Zhejiang Prov Key Lab Carbon Cycling Forest Ecosy, Hangzhou, Zhejiang, Peoples R China
[3] China Meteorol Adm, Natl Meteorol Ctr, Beijing, Peoples R China
[4] Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210008, Peoples R China
[5] China Agr Univ, Coll Resource & Environm, Beijing 100094, Peoples R China
关键词
SURFACE-TEMPERATURE; WATER CONTENT; SCALE; SPACE;
D O I
10.1080/01431160903527421
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
Soil moisture is an important indicator to describe soil conditions, and can also provide information on crop water stress and yield estimation. The combination of vegetation index (VI) and land surface temperature (LST) can provide useful information on estimation soil moisture status at regional scale. In this paper, the Huang-huai-hai (HHH) plain, an important food production area in China was selected as the study area. The potential of Temperature-Vegetation Dryness Index (TVDI) from Moderate Resolution Imaging Spectroradiometer (MODIS) data in assessing soil moisture was investigated in this region. The 16-day composite MODIS Vegetation Index product (MOD13A2) and 8-day composite MODIS temperature product (MOD11A2) were used to calculate the TVDI. Correlation and regression analysis was carried out to relate the TVDI against in-situ soil moisture measurements data during the main growth stages of winter wheat/summermaize. The results show that a significantly negative relationship exists between the TVDI and in-situ measurements at different soil depths, but the relationship at 10-20 cm depth (R-2 = 0.43) is the closest. The spatial and temporal patterns in the TVDI were also analysed. The temporal evolution of the retrieved soil moisture was consistent with crop phenological development, and the spatial distribution of retrieved soil moisture accorded with the distribution of precipitation during the whole crop growing seasons. The TVDI index was shown to be feasible for monitoring the surface soil moisture dynamically during the crop growing seasons in the HHH plain.
引用
收藏
页码:1165 / 1177
页数:13
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