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[1]YIN Shiyan,MAO Fangjie,ZHOU Guomo,et al.Multi-scalar Spatiotemporal Pattern and Evolution Trend of Drought in Subtropical China[J].Research of Soil and Water Conservation,2022,29(06):242-253.

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Multi-scalar Spatiotemporal Pattern and Evolution Trend of Drought in Subtropical China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 242-253 Column: Public date: 2022-10-20

Title:: Multi-scalar Spatiotemporal Pattern and Evolution Trend of Drought in Subtropical China

Author(s):: YIN Shiyan^1,2,3, MAO Fangjie^1,2,3, ZHOU Guomo^1,2,3, DU Huaqiang^1,2,3, LI Xuejian^1,2,3, CHEN Qi^1,2,3, YAN Mengjie^1,2,3; (1.State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 310000, China; 2.Zhejiang Province Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A&F University, Hangzhou 310000, China; 3.School of Environment and Resources Science, Zhejiang A&F University, Hangzhou 310000, China)

Keywords:: subtropical; drought; SPEI; multi-scalar; spatiotemporal characteristics

CLC:: P426; P429

DOI:: -

Abstract:: In order to investigate the spatio-temporal characteristics of drought in subtropical regions of China at different time scales, standardised precipitation evapotranspiration index(SPEI)was calculated using 1 km meteorological data from 1959 to 2019, and the linear variation trend, influence area, intensity and frequency of drought were combined. The temporal and spatial characteristics of drought in subtropical regions of China under different time scales(1, 3, 6, 12 months)were analysed. The results are as follows:(1)The drought period is mainly concentrated in 2004—2014, the spatial contrast between the east and the west of the drought area is obvious, and the drought trend in autumn is the most significant on the time scale;(2)The drought area is fluctuating with an increasing trend, especially obvious after 1995;(3)The time scalar of seasons and dry/wet seasons with high drought intensity has scattered distribution in Hunan Province, Jiangxi Province, and other southwestern provinces. The high intensity of yearly scalar is mainly concentrated in the southeast of the subtropical China;(4)droughts most frequently occurred in autumn, and the frequency of mid-above drought in interannual is the highest. In spring, the frequency of mid-above drought is concentrated in Sichuan Province and the Tibetan Autonomous Region. In autumn and inter-annual, it is mainly concentrated in the junction of Sichuan Province, Chongqing City and Guizhou Province. In summer, winter and dry/wet seasons, it is scattered in subtropical provinces. Above all, subtropical China generally presents a trend of aridification. The time series of seasonal, dry/wet seasons, and the inter-annual have similar trends in drought influence area, but the intensity and frequency have some differences throughout the whole study area.

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Last Update: 2022-10-20