Journal
REMOTE SENSING
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/rs11091066
Keywords
drought monitoring; water balance; vegetation-soil water deficit (VSWD); Northeast China
Categories
Funding
- three year action plan for nurturing and developing new industries in the northeastern region of the National Development and Reform Commission - central government budget, Special construction plan for provincial and University [[2016] 512]
- program for JLU Science and Technology Innovative Research Team (JLUSTIRT) - Fundamental Research Funds for the Central Universities, China [2017TD-26]
- Changbai Mountain Scholars Program, Jilin Province, China
- NERC [bgs05007, bgs06003] Funding Source: UKRI
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Drought, which causes the economic, social, and environmental losses, also threatens food security worldwide. In this study, we developed a vegetation-soil water deficit (VSWD) method to better assess agricultural droughts. The VSWD method considers precipitation, potential evapotranspiration (PET) and soil moisture. The soil moisture from different soil layers was compared with the in situ drought indices to select the appropriate depths for calculating soil moisture during growing seasons. The VSWD method and other indices for assessing the agricultural droughts, i.e., Scaled Drought Condition Index (SDCI), Vegetation Health Index (VHI) and Temperature Vegetation Dryness Index (TVDI), were compared with the in situ and multi-scales of Standardized Precipitation Evapotranspiration Index (SPEIs). The results show that the VSWD method has better performance than SDCI, VHI, and TVDI. Based on the drought events collected from field sampling, it is found that the VSWD method can better distinguish the severities of agricultural droughts than other indices mentioned here. Moreover, the performances of VSWD, SPEIs, SDCI and VHI in the major historical drought events recorded in the study area show that VSWD has generated the most sensible results than others. However, the limitation of the VSWD method is also discussed.
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