[1]LI Xia,LIU Tingxi,DUAN Limin,et al.Estimation of Reference Crop Evapotranspiration and Analysis of Impact Factors in Horqin Sandy Land[J].Research of Soil and Water Conservation,2020,27(06):153-159.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 06
Page number:
153-159
Column:
目次
Public date:
2020-10-20
- Title:
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Estimation of Reference Crop Evapotranspiration and Analysis of Impact Factors in Horqin Sandy Land
- Author(s):
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LI Xia1, LIU Tingxi1,2, DUAN Limin1,2, WANG Guanli1,2, ZHOU Yajun1
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(1.Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China; 2.Inner Mongolia Key Laboratory of Water Resource Protection and Utilization, Inner Mongolia Agricultural University, Hohhot 010018, China)
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- Keywords:
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reference crop evapotranspiration; Penman-Monteith model; path analysis; Horqin sandy land
- CLC:
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P426.2
- DOI:
-
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- Abstract:
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In order to accurately assess the regional climate condition and protect the ecological environment in semi-arid areas, based on the daily meteorological data of five typical landscape types including meadow land, semi-mobile sand dune, semi-fixed sand dune, rice and maize land from 2015 to 2018 in Horqin area, reference crop evapotranspiration(ET0)was calculated by using FAO56 Penman-Monteith model. Changes in ET0 on different time scales was analyzed, and then causes of ET0 changes were analyzed through path analysis and index sensitivity analysis. The results showed that:(1)the 4-year average ET0 was 1 051 mm, the annual value of ET0 fluctuated between 922 mm and 1 257 mm at different sample plots, and the maximum value appeared in 2017;(2)the seasonal change of ET0 decreased in the order: summer>spring>autumn>winter;(3)inter-monthly changes of ET0 were parabolic, with the largest contribution from March to October and accounting for more than 80% of ET0 in the whole year;(4)In path analysis, the path coefficients of meteorological factors to ET0 decreased in the order: VPD>Rn>u2>Tmax, and the maximum direct action coefficient was 0.614. indicating that VPD was the most important factor to affecting ET0, Tmax had the largest indirect effect on ET0, and the indirect action coefficient was 0.936, and it mainly affected ET0 through VPD path, and the indirect action coefficient was 0.554; in the index sensitivity analysis, E decreased from 0.993 to 0.877 after removing VPD, which further indicated that ET0 was the most sensitive to the change of VPD. In general, VPD was the main factor for evapotranspiration in Horqin sandy land.