| Temporal and spatial evolution of agricultural drought and its natural recovery period in the Yellow River Basin |
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| DOI：10.7606/j.issn.1000-7601.2022.02.26 |
| Key Words: agricultural drought drought recovery time spatial heterogeneity Yellow River Basin |
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| Abstract: |
| Frequent and widespread agricultural drought events seriously restrict the ecological protection and high\|quality development of the Yellow River Basin, and threaten the safety of food production. This study took the Yellow River Basin as an example, and constructed a modified Palmer Drought Index (sc_PDSI) to clarify the spatial and temporal evolution characteristics of agricultural drought events in different climatic regions based on the CRU climate data from 1970 to 2014. In addition, taking 0.25°×0.25° grid as response unit, the natural recovery period of agricultural drought accurately identified by coupling agricultural drought diagnosis and the land water storage data and spatial distribution pattern of natural recovery period of agricultural drought was explored by using global and local Moran’s I index. The results showed that the degree of agricultural aridity in the upper reaches of the Yellow River had been alleviated, while that in the lower reaches had been intensified, especially in the early 21st century. Meanwhile, the recovery time of agricultural drought in the Yellow River Basin was between 1 month and 36 months. The number of grids corresponding to drought recovery time less than 4 months accounted for 42.68% of the whole Yellow River Basin. On the contrary, the proportion of response unit area greater than 4 months was 57.32%. There was significant spatial autocorrelation in the recovery time of agricultural drought, and it passed the significance test of 99% confidence level. The findings from the study provide some reference for water management institutions in flood control and drought relief to ensure proper development of crops in the Yellow River Basin. |
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