期刊
AGRICULTURAL WATER MANAGEMENT
卷 283, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.agwat.2023.108305
关键词
Agricultural drought; Soil moisture; GLDAS; Drought severity index; Drought frequency; China
Agricultural drought poses threats to global water security, food security, and natural ecosystems. This study aimed to identify a reliable and accurate agricultural drought index that works well in both dry and wet climates. The results showed that the Drought Severity Index (DSI) based on the Global Land Data Assimilation System (GLDAS) performed the best in identifying agricultural drought in different regions of China.
Agricultural drought threatens global water security, food security, and natural ecosystems. Accurate identifi-cation of agricultural drought is a crucial task to mitigate its consequences. However, it is challenging to achieve reliable and accurate regional agricultural drought assessment in both wet and dry climates at the same time. Therefore, the objective of this study is to identify a reliable and accurate agricultural drought index that per -forms well in both dry and wet climates. Drought indices such as the Standardized Precipitation Index (SPI), the Vegetation Condition Index (VCI), the Soil Moisture Anomaly index (SMA), and the Drought Severity Index (DSI) were calculated and compared against in situ drought information devised by official sources in China. The results showed that: (1) DSI based on the Global Land Data Assimilation System (GLDAS) products performed the best in identifying agricultural drought in both dry and wet climate regions of China. (2) Agricultural regions such as Northern arid and semiarid regions, Northeast China Plain, Huang-Huai-Hai Plain, and Loess Plateau, experienced moderate and severe agricultural droughts with a frequency of 20%. (3) The frequency of agri-cultural droughts observed in Northern arid and semi-arid regions and Northeast China Plain has slowed significantly over the last two decades with a significance level of 0.01. On the other hand, the number of agricultural droughts has increased in Yunnan-Guizhou Plateau since 2002.
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