Prediction of Soil Water Thresholds for Trees in the Semi-Arid Region on the Loess Plateau
文献类型： 外文期刊
作者： Chi, Chunming 1 ; Wang, Jingjing 3 ; Zhi, Jinhu 1 ;
作者机构： 1.Tarim Univ, Coll Agr, Alar 843300, Peoples R China
2.Tarim Univ, Res Ctr Oasis Agr Resources & Environm Sourthern X, Alar 843300, Peoples R China
3.Xinjiang Acad Agr Sci, Inst Forestry & Hort, Shihezi 832000, Peoples R China
关键词： soil water content of capillary break; field capacity; soil bulk density; fraction of transpirable soil water
期刊名称：PROCESSES （ 影响因子：3.352； 五年影响因子：3.338 ）
ISSN：
年卷期： 2022 年 10 卷 11 期
页码：
收录情况： SCI
摘要： It is important to obtain the soil water content threshold (theta(THR)) for agricultural water management. However, the measurement of theta(THR) is time consuming and needs specialized and expensive equipment. The accuracy of the empirical estimates is often low. Therefore, the development of a simple, rapid, and accurate prediction method for theta(THR) is the focus of the present study. The value of theta(THR) is regarded as the soil water content at the capillary break capacity (theta(CB)). A formula based on field capacity (theta(FC)) and soil bulk density (D-b) is proposed to calculate theta(CB), expressed as theta(CB)=theta(FC)-0.21*1-D-b/2.65. Six soils from six published studies on the response of tree physiological processes to water deficit were used to calculate theta(CB) using this formula. The calculated theta(CB) values were compared with the measured theta(THR). The results showed that the calculated theta(CB) values were nearly equal to the measured theta(THR). A highly significant (adj R-2 = 0.9826, p < 0.001) linear relationship with a slope of 0.9506 and a y intercept of 0.0072 was found between the calculated theta(CB) and measured theta(THR). The formula proposed in this study provides a novel approach for estimating the theta(THR) of trees in the semi-arid regions on the Loess Plateau.
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