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[1]LUO Dengze,JIN Xiaoyan,QIANG Haofan,et al.Analysis on the Spatial and Temporal Evolution Characteristics of Dry-wet Conditions in Zoige Wetland Based on SPEI[J].Research of Soil and Water Conservation,2019,26(02):227-233.

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Analysis on the Spatial and Temporal Evolution Characteristics of Dry-wet Conditions in Zoige Wetland Based on SPEI

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 227-233 Column: Public date: 2019-04-28

Title:: Analysis on the Spatial and Temporal Evolution Characteristics of Dry-wet Conditions in Zoige Wetland Based on SPEI

Author(s):: LUO Dengze^1,2, JIN Xiaoyan^1,2, QIANG Haofan^1,2, LIANG Chuan^1,2; 1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China;
2. Provincial Key Laboratory of Water-Saving Agriculture in Hilly Areas of South China, Chengdu 610066, China

Keywords:: SPEI index; cloud model; Mann-Kendall text; EOF decomposition; Zoige Wetland

CLC:: P467

DOI:: -

Abstract:: Zoige Wetland is an important source of water supply in the upper reaches of the Yellow River, and is also a major area of marsh distribution in China. Knowledge of the spatiotemporal evolution characteristics of dry-wet conditions is essential for the further studies on climate and environmental changes in Zoige Wetland. Based on the daily meteorological data from 19 meteorological stations in the Zoige area from 1961 to 2016, the standardized precipitation evapotranspiration index (SPEI) on different time scales was calculated. By using the cloud model, Mann-Kendall test, empirical orthogonal function (EOF) and other methods, the characteristics of spatiotemporal evolution of dry-wet conditions in Zoige Wetland during the past 56 years were analyzed. The results showed that: (1) the dry-wet evolution could be roughly divided into such four stages as humid-arid-humid-arid stage in the past 56 years, while the turning points were observed in 1969, 1975 and 1999 and drought occurred more frequently after 1995; Mann-Kendall test showed that there was no significant mutation of dry-wet condition in Zoige wetland; (2) cloud model analysis showed that the spatial distribution of SPEI was more uniform than the time distribution, and the spatial dry-wet evolution was more stable; dry-wet changes in different seasons showed the different intensity, dispersion and stability; the most serious drought occurred in spring followed by winter, drought was most uniform and stable in winter; (3) the eigenvectors obtained by EOF analysis and the corresponding time coefficients reflected the main characteristics of the spatiotemporal evolution of drought in Zoige Wetland. As a result of the influence of large scale climate systems, the first mode of EOF showed a uniform drought trend in the entire region. The differences between the north-south reverse and east-west reverse were the second and third mode, which reflected the influence of latitude and longitude on SPEI index.

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