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[1]XIAO Yang,ZHOU Xu,LUO Xue,et al.Spatiotemporal Variation Characteristics of Potential Evapotranspiration and Identification of Leading Factors in Central Guizhou in Recent 60 Years[J].Research of Soil and Water Conservation,2021,28(06):190-198.

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Spatiotemporal Variation Characteristics of Potential Evapotranspiration and Identification of Leading Factors in Central Guizhou in Recent 60 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 06 Page number: 190-198 Column: Public date: 2021-10-10

Title:: Spatiotemporal Variation Characteristics of Potential Evapotranspiration and Identification of Leading Factors in Central Guizhou in Recent 60 Years

Author(s):: XIAO Yang，ZHOU Xu，LUO Xue，LI Hongguang，LIANG Rengang，YANG Dafang; (School of Geographic and Environmental Sciences，Guizhou Normal University，Guiyang 500025，China)

Keywords:: potential evapotranspiration; Penman-Monteith model; meteorological factors; spatial and temporal variations; central Guizhou

CLC:: P426.2

DOI:: -

Abstract:: Potential evapotranspiration is a component of the hydrological cycle and global energy balance. Its long-term changes have attracted much attention in climate change research. Research on its changes is of great significance to regional water resources allocation，agricultural development，and ecological environment protection. Based on the daily meteorological data of 11 meteorological stations in central Guizhou from 1960 to 2019，the Penman-Monteith model was used to calculate the potential evapotranspiration，and the temporal and spatial variation characteristics and periodic variation characteristics of annual average and four seasonal potential evapotranspiration were analyzed by using Theil-Sen median trend analysis，Mann-Kendall test，and wavelet analysis. Correlation analysis method was use to study the main meteorological elements that affected potential evapotranspiration. The results show that:(1)the potential evapotranspiration in central Guizhou showed a significant downward trend from 1960 to 2019，with a change rate of about -6.00 mm/decade，and there were obvious differences in the interannual，interdecadal and seasonal scales;(2)the overall potential evapotranspiration in the four seasons showed a decreasing trend，with the rate of change being -2.10 mm/decade，-3.01 mm/decade，-0.17 mm/decade，and -0.62 mm/decade; that the potential evapotranspiration in summer and spring accounted for the 65.91% of the total aunual potential evapotranspiration was the main reason for the decline in annual potential evapotranspiration;(3)the spatial distribution of potential evapotranspiration was decreasing from south to north，and its change trend was decreasing in the middle(southeast northwest)and increasing in the north and south parts of the region;(4)the potential evapotranspiration had an obvious sudden change in 1969，and there was 21-year main cycle and a 3-year secondary cycle;(5)there was a ‘evaporation paradox' phenomenon in the study area; Sunshine hours were the main meteorological factors affecting the variation of potential evapotranspiration，followed by wind speed，and the influence of various meteorological factors on the potential evapotranspiration varied seasonally. This research can provide a certain scientific basis for the rational allocation of water resources and agricultural production in central Guizhou under the changing environment.

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Last Update: 2021-10-10