Temporal-spatial Evolution of Drought Characteristics at Different Grades in Yulin
Under the background of climate warming and human activities,Yulin city suffers from frequent drought,which has adverse effect on the agriculture,ecological environment and social economy in this area.Although the adverse effects of drought on the Loess Plateau have attracted the attention of many s...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Pearl River
2021-01-01
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| Series: | Renmin Zhujiang |
| Subjects: | |
| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.11.005 |
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| Summary: | Under the background of climate warming and human activities,Yulin city suffers from frequent drought,which has adverse effect on the agriculture,ecological environment and social economy in this area.Although the adverse effects of drought on the Loess Plateau have attracted the attention of many scholars,there is still a lack of grid and refined spatial and temporal assessment of drought in Yulin City.Therefore,taking Yulin City as the study area,based on the monthly precipitation and soil moisture data with a spatial resolution of 0.25°×0.25°,this paper calculates the standardized precipitation index (SPI) and the standardized soil moisture index (SSMI) on three month scales,identifies the drought characteristic parameters by the run theory,and analyzes the spatial-temporal evolution of drought characteristics at different grades.The results show that:The drought is rigorous in Yulin city.In time,a wet trend appears in spring and winter,while a dry trend in summer.In space,there is a significant dry trend in the southern of Yulin city.There are more than 6 months of long-term precipitation deficit and 12 months of long-term soil moisture deficit in Yulin City,respectively,and the month with consecutive precipitation deficit come earlier than the soil moisture deficit.Areas with high drought frequency are located in the northern,southern and eastern edges of Yulin.The conclusion is of great significance to the drought prevention,social production and ecological environment in Yulin city. |
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| ISSN: | 1001-9235 |