HUBEI AGRICULTURAL SCIENCES ›› 2023, Vol. 62 ›› Issue (12): 56-62,119.doi: 10.14088/j.cnki.issn0439-8114.2023.12.012

• Resource & Environment • Previous Articles     Next Articles

The evolution characteristics and driving factors analysis of reference crop evapotranspiration in the agricultural and pastoral ecotone of Sichuan Province and Yunan Province

HOU Ling-lin1, HUANG Xi-wei2, XU Xia1, NIE Chang-le3,4   

  1. 1. The Faculty Geography Resource Sciences, Sichuan Normal University, Chengdu 610101, China;
    2. Tibet Changdu No. 4 Senior High School, Changdu 854000, Tibet, China;
    3. Jinhua Binhong Senior High School, Jinhua 321000, Zhejiang, China;
    4. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
  • Received:2022-10-28 Published:2024-01-10

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Abstract: Based on the daily meteorological data of 24 ground observation stations in the agricultural and pastoral ecotone of Sichuan Province and Yunan Province from 1961 to 2015, the daily reference crop evapotranspiration （ET0） and surface humid index （SWI） of each station were calculated by Penman-Monteith formula. The temporal and spatial variation characteristics of ET0 and SWI in the study area, and the influence degree of main meteorological factors on the evolution of evapotranspiration in different areas were analyzed using the climatic tendency rate, inverse distance weighting （IDW） interpolation, Mann-KendalL mutation test, principal component regression analysis and other methods. The results showed that, from 1961 to 2015, ET0 in the agricultural and pastoral ecotone of Sichuan Province and Yunan Province showed a downward trend, SWI showed a slow upward trend, and 1987 was the mutation year of ET0 and SWI. The boundary between the humid area and the semi-humid area could be approximately divided by the boundary of Hengduan Mountains.The reference crop evapotranspiration of the whole region was decreasing in four seasons, and the temporal and spatial evolution of reference crop evapotranspiration in winter was not significant. Average wind speed was the dominant factor affecting the change of ET0, followed by sunshine hours and relative humidity, and ET0 had the weakest response to the lowest temperature.

Key words: reference crop evapotranspiration, surface wetting index, evolution characteristics, driving factors, the agricultural and pastoral ecotone of Sichuan Province and Yunan Province

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