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[1]JIN Xiaoyan,CHEN Yiran,GUO Jiachen,et al.Temporal-Spatial Dynamic Characteristics and Impact Factors of Potential Evapotranspiration in Zoige Wetland[J].Research of Soil and Water Conservation,2019,26(01):234-239.

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Temporal-Spatial Dynamic Characteristics and Impact Factors of Potential Evapotranspiration in Zoige Wetland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 234-239 Column: Public date: 2019-02-28

Title:: Temporal-Spatial Dynamic Characteristics and Impact Factors of Potential Evapotranspiration in Zoige Wetland

Author(s):: JIN Xiaoyan^1,2, CHEN Yiran³, GUO Jiachen^1,2, LUO Dengze^1,2, QIANG Haofan^1,2,4; 1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China;
2. Provincial Key Laboratory of Water-Saving Agriculture in Hilly Areas of South China, Chengdu 610066, China;
3. School of Materials Science and Engineering, Shandong University, Jinan 250061, China;
4. School of Economics, Fudan University, Shanghai 200433, China

Keywords:: Zoige Wetland; potential evapotranspiration; Penman-Monteith model; trend analysis; temporal-spatial variation

CLC:: P467

DOI:: -

Abstract:: Potential evapotranspiration (ET₀) is of great significance for water resources assessment and climate change. Based on daily meteorological data of 19 weather stations in Zoige Wetland and its surrounding area from 1960 to 2015, ET₀ was calculated by the radiation-calibrated Penman-Monteith model. The temporal-spatial change characteristics of ET₀ were analyzed by cumulative departure, Mann-Kendall test, Pettitt test, Theil-Sen slope estimator and Hurst index, while the influencing factors of ET₀ were investigated by principal component analysis. The results showed that:(1) the average of annual ET₀ was 625.3 mm with a significant increasing trend of 4.89 mm/10 a (p < 0.01); The ET₀ of four seasons decreased in the sequence:summer > spring > autumn > winter; the annual, autumn and winter ET₀ showed a significant abrupt point in 1968 (p < 0.01), 1997 (p < 0.01) and 2003 (p < 0.1), respectively, while there was no mutation in spring and summer ET₀; (2) the average annual ET₀ was high in the southern and eastern edges and low along the northwest-southeast line with the changing rate decreasing from northeast to southwest, while ET₀ of the northern area to Banma and the region between Maerkang and Heishui showed a slowly decreasing trend; (3) the Hurst index of ET₀ ranged from 0.56 to 0.91, which mainly distributed high around the circum and low in the middle; the future change trend of ET₀ for the entire region is mainly towards a persistent increase and this area accounts for 96.88% of the total; (4) the dominant reason for ET₀ increase was temperature increase, followed by sunshine duration increase and relative humidity decrease. The reduction of ET₀ caused by decrease of net radiation, wind speed and precipitation is offset by other factors.

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