Capability of Existing Drought Indices in Reflecting Agricultural Drought in China,Journal of Geophysical Research: Biogeosciences

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Capability of Existing Drought Indices in Reflecting Agricultural Drought in China
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2021-07-27 , DOI: 10.1029/2020jg006064
Zhe Zhao ₁ , Kaicun Wang ₁

Affiliation

A variety of drought indices have been constructed to monitor agricultural drought using ground-based observations and satellite data. The drought indices focus on diverse aspects of agricultural drought and may have diverse applicability in different regions. We calculated seven popular drought indices and evaluated their performances on monitoring agricultural drought in the main agricultural regions of China (i.e., Northeast China, the North China Plain, the middle-and-lower reaches of the Yangtze River, and the Sichuan Basin). The independent assessment data used here included three aspects: soil moisture, vegetation photosynthesis (i.e., sun-induced chlorophyll fluorescence, SIF), and crop yield. Results show that drought indices with one-month time scale are more sensitive to topsoil moisture than drought indices with longer time scales. Drought indices based on regular meteorological data (DI_met) and synthesized drought indices (DI_syn) show better performances on capturing drought impacts on the SIF than other drought indices. DI_syn is more appropriate for predicting drought impact on crop yield than other drought indices. In addition, drought impact on vegetation photosynthesis and crop yield is lessened in humid or irrigated regions. Our study sheds light on agricultural drought researches in the future.

更新日期：2021-08-20

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