Spatio-temporal changes and causes of winter and spring reference crop evapotranspiration in Sichuan

doi:10.3969/j.issn.1004-1524.2020.04.01

›› 2020, Vol. 32 ›› Issue (4): 559-570.DOI: 10.3969/j.issn.1004-1524.2020.04.01

• Crop Science • Previous Articles Next Articles

Spatio-temporal changes and causes of winter and spring reference crop evapotranspiration in Sichuan

ZHOU Li¹, NIE Changle¹, REN Yitong¹, LIANG Jingjing¹, XU Hua²

1. School of Geography & Resource Science, Neijiang Normal University,Neijiang 641199, China;
2. Weather Bureau of Zizhong County, Zizhong 641200, China

Received:2019-10-23 Online:2020-04-25 Published:2020-04-26

Abstract

Abstract: To make a better understanding of the variation characteristics of reference crop evapotranspiration (ET₀) in winter and spring in Sichuan Province, based on the daily observed data of 35 meteorological stations in Sichuan from 1980 to 2016, the spatio-temporal changes of ET₀ in winter and spring in Sichuan were analyzed with Thiessen polygon, climate change rate and Kriging spatial interpolation method. Then, the sensitivity coefficients were combined with the contribution rate to study the causes of ET₀ changes. The results showed that the interdecadal variation of ET₀ firstly decreased and then increased. The distribution was obviously high in the southwest and low in the east, and the range of the high value area continued to expand, while the range of the low value area narrowed down in fluctuation. The interannual variation of ET₀ showed an upward trend. The climate change rate and spatial difference of ET₀ in spring were greater than that in winter, and the distribution of the high value area and the low value area of ET₀ was affected by the altitude. The multi-year mean value of the same day ET₀ increased gradually from early winter to early spring. During January 22 to May 2, there was an obvious continuous period of high value, in which the ET₀ value lower than the multi-year daily mean value appeared only in 8 d from 1980 to 2016. Sunshine hours showed positive sensitive coefficient, which was also the most sensitive variable, followed by relative humidity and mean temperature. Temperature was the main factor that affected ET₀ change with the largest contribution rate, which was followed by relative humidity. The positive effects caused by the increasing trend in mean temperature and the negative effects caused by the decreasing trend in relative humidity on ET₀ exceeded the effects caused by the decreasing sunshine hours, which resulted in the ET₀ rise in winter and spring in Sichuan.

Key words: reference crop evapotranspiration, winter and spring, climate change rate, sensitivity coefficient, contribution rate

CLC Number:

S161.4

ZHOU Li, NIE Changle, REN Yitong, LIANG Jingjing, XU Hua. Spatio-temporal changes and causes of winter and spring reference crop evapotranspiration in Sichuan[J]. , 2020, 32(4): 559-570.

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Spatio-temporal changes and causes of winter and spring reference crop evapotranspiration in Sichuan

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