The relationship between soil water potential and water content of two soils
WU Yanyou1,2,3, HU Linsheng1,2, GU Ruizhi1,2, WU Yansheng1,2, LI Minghong1,2
1.Institute of Agricultural Equipment Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3.Research Center for Environmental Bio-Science and Technology, State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China
Abstract:Soil moisture characteristic curves of the two species of soils were researched. Based on the Gibbs free energy,the model of soil water potential and water content was founded. As loam and loam clay were two common soils, the relationship between soil water potential and moisture losing time with four soil water levels was monitored, and Logistic equation was used to fit the relationship between soil water potential and water content. The results showed that the established model based on Gibbs free energy was quite feasible since the relationship between soil water potential and moisture losing time can be well fitted by Logistic equation. And the relationship between water content(calculated by the model of soil water potential and water content)and moisture losing time can be well fitted with Logistic equation. The field water capacity of loam clay was 11.6% higher than that of the loam. However,the time point when water content of loam decreased to wilting moisture was later than that of the loam clay, which indicated that the water-holding capacity of the loam was obviously higher than that of the loam clay. This research could provide the real-time irrigation technical support for the information of crop water demand.
吴沿友,,, 胡林生,, 谷睿智,, 吴沿胜,, 黎明鸿,. 两种土壤含水量与水势关系[J]. 排灌机械工程学报, 2017, 35(4): 351-356.
WU Yanyou,,, HU Linsheng,, GU Ruizhi,, WU Yansheng,, LI Minghong,. The relationship between soil water potential and water content of two soils. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(4): 351-356.
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