锡林郭勒盟潜在蒸散量和干燥指数的变化特征

doi:10.16843/j.sswc.2019.06.003

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Abstract [Background] To study the spatial and temporal distribution characteristics of potential evapotranspiration (P_ET) and drying index (I_A) in Xilingol League and to understand the drought situation in this area are of great significance for further study of vegetation status, environmental change and agricultural water resources management in this area.[Methods] Based on the meteorological data of 11 weather stations in and around the study area from 1957 to 2016, the P_ET and I_A values were obtained using Penman-Montes model (P-M model) and I_A formulas. Three mutation detection methods, radial basis function interpolation method and partial correlation analysis were used to explore the temporal and spatial characteristics of P_ET and I_A and their influencing factors.[Results] From 1957 to 2016, the average P_ET was 875.82 mm and I_A was 0.615 6, which showed an increasing trend; the distribution of P ET was mainly concentrated in summer, accounting for 46.28%, the smallest in winter, accounting for only 4.15%, the largest in spring, the driest in summer, the smallest in relative humidity. Both P_ET and I_A showed an increasing trend from northeast to southwest; the mutation of P_ET occurred in 1984 and 1998, I_A abrupt change occurred in 1998 and 2001; P_ET and I_A were the most sensitive to wind speed.[Conclusions] The degree of drought in the study area increased from 1957 to 2016. Statistics for many years showed that the drought was the most severe in spring, and the degree of drought in spatial distribution increased from northeast to southwest.

Key words： potential evapotranspiration drying index climate factors tendency Xilingol League

Received: 23 October 2018

PACS:

P422

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	Articles by authors
	MA Zice
	YU Hongbo
	CAO Congming
	ZHANG Qiaofeng

Cite this article:

MA Zice,YU Hongbo,CAO Congming, et al. Variation characteristics of potential evapotranspiration and drying index in Xilingol League[J]. SSWC, 2019, 17(6): 19-26.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.06.003 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I6/19

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