[1]Cong Shixiang,Wang Rongrong,Chang Wenjing,et al.Characteristics of Spatial and Temporal Evolution of Drought Hazard in the Middle Arid Zone of Ningxia Based on Standardized Precipitation Index(SPI)[J].Research of Soil and Water Conservation,2024,31(04):223-232.[doi:10.13869/j.cnki.rswc.2024.04.045]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 04
Page number:
223-232
Column:
Public date:
2024-06-30
- Title:
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Characteristics of Spatial and Temporal Evolution of Drought Hazard in the Middle Arid Zone of Ningxia Based on Standardized Precipitation Index(SPI)
- Author(s):
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Cong Shixiang1, Wang Rongrong1, Chang Wenjing1, Yu Hailong1, Huang Juying2
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(1.School of Geography and Planning, Ningxia University, Yinchuan 750021, China; 2.School of Ecology and Environment, Ningxia University, Yinchuan 750021, China)
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- Keywords:
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drought; standardized precipitation index(SPI); the middle arid zone of Ningxia; spatial-temporal evolution characteristics
- CLC:
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S423
- DOI:
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10.13869/j.cnki.rswc.2024.04.045
- Abstract:
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[Objective]The aims of this study are to reveal the spatial and temporal characteristics of drought risk in the central arid zone of Ningxia, and to provide scientific basis for agricultural production, agricultural disaster prevention and control, planting structure adjustment and agricultural irrigation guidance in the central arid zone of Ningxia. [Method]The meteorological observation data of the five meteorological stations including Shapotou, Zhongning County, Tongxin County, Yanchi County, and Haiyuan County in the middle arid zone of Ningxia were collected, and the temporal and spatial variations of drought levels and the spatial-temporal evolution characteristics of drought risk over the past 39 years(1981—2019)was analyzed and evaluated by calculating the Standardized Precipitation Index(SPI)and combining with GIS technology. [Results]The SPI12 results revealed a fluctuating trend with an intensifying tendency in decennial droughts(the slope of the trend line ranged from -0.004 to 0.003). The SPI3 results demonstrated a significant spatial heterogeneity in the spatial-temporal distribution of seasonal drought risk featured with a prominent characteristics of a low risk in the south and high risk in the north at spatial scales, and continuous drought at temporal scales. The frequencies of drought in spring and winter exceeded 45%. However, the occurrence of drought in summer and autumn was not significant, with a frequency ranging from 10.26% to 43.59%. The evaluation of the temporal and spatial evolution characteristics of drought risk revealed a fluctuating trend of decennial drought risk, initially decreased and then increased. There were remarkable differences in the spatial-temporal distribution of seasonal drought risk, with a characteristic of increasing risk from south to north spatially and higher risk in spring and winter temporally but lower risk in summer and autumn. [Conclusion]The spatial and temporal heterogeneity of seasonal-scale drought risk in the central arid zone of Ningxia is obvious, with high drought risk in Shapotou District and Zhongning County, and drought prevention and control should be strengthened in the future for the spring, fall and winter seasons.