[1]KONG Lingying,FU Songlin,HAN Xiaoyang,et al.Spatiotemporal Variation of Long-term Meteorological Drought and Its Impacts on Grain Yield in Shaanxi Province Based on the Traditional Arid-Wet Index[J].Research of Soil and Water Conservation,2020,27(03):159-167.
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Spatiotemporal Variation of Long-term Meteorological Drought and Its Impacts on Grain Yield in Shaanxi Province Based on the Traditional Arid-Wet Index
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
159-167
Column:
目次
Public date:
2020-04-20
- Title:
- Spatiotemporal Variation of Long-term Meteorological Drought and Its Impacts on Grain Yield in Shaanxi Province Based on the Traditional Arid-Wet Index
- CLC:
- S162.5
- DOI:
- -
- Abstract:
- Drought is one of the major meteorological disasters in the Shaanxi Province. Frequent drought has a serious impact on agricultural production, social and economic development, ecological environment and other aspects. Based on the daily meteorological data of 22 selected weather stations in the Shaanxi Province during 1960—2017, using the traditional aridity index as the meteorological drought index, we redefined the aridity threshold via potential evapotranspiration(ET0)calculated by the FAO56-Penman-Monteith equation, and analyzed the spatiotemporal variation of long-term meteorological drought in Shaanxi Province. The results are as follows. First, the climate boundaries between the humid, semi-humid, semi-arid, arid and dry, redefined by the FAO56-PM equation, were 0.58, 1.17, 1.77, 2.36 and 4.74, respectively. The variation of annual aridity index of most stations showed the increasing trend, especially in the northern Shaanxi and Guanzhong areas. Second, the average annual aridity index of all stations in the province decreased gradually from north to south, and the inter-decadal variation of the arid-wet climate boundary was obvious. Third, the occurrence frequency of drought showed the increasing trend in the whole province. Spatially, it gradually decreased then slightly increased from Shaanbei area to Guanzhong area, and then gradually decreased from Guanzhong area to Shaannan area. Seasonally, the occurrence frequency of drought increased in spring, autumn and winter, but decreased in summer. Fourth, the degree of drought in the northern area of the province was greater than that in the southern area of the province; however, the number of non-drought years decreased successively from Shaannan area to Shaanbei area. The mild drought and moderate drought mainly occurred in the southern area of the province in summer, while the severe drought occurred in the northern area of the province in winter and spring. Fifth, the influence of aridity and precipitation on grain yield in Shaanbei area was significant.
- References:
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Last Update:
2020-04-30