两种土壤含水量与水势关系
Relationship between soil water potential and water content of two soils
查看参考文献19篇
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文摘
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研究了2种土壤的水分特征曲线以及不同土壤水分随时间的变化规律.依据吉布斯自由能公式,可以导出土壤水分特征曲线模型;以壤土和壤质黏土为研究对象,设置4个水分水平,监测了连续干旱下土壤水势和时间的关系,运用Logistic方程对两者之间的关系进行拟合.结果表明:依据吉布斯自由能公式导出的土壤水势和含水量的关系模型精确性很高;Logistic方程能很好地拟合土壤水势随时间的变化关系;由土壤水势推算的土壤含水量随时间的变化关系也可用 Logistic方程很好地拟合.壤质黏土的田间持水量比壤土高出11. 6%,壤土的含水量下降到凋萎含水量的时间较壤质黏土要晚,说明了壤土保持作物可利用的水分能力要高于壤质黏土.研究结果可为作物的需水信息提供技术支持. |
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其他语种文摘
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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 found. 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 show 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. 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. |
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来源
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排灌机械工程学报
,2017,35(4):351-356 【扩展库】
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DOI
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10.3969/j.issn.1674-8530.16.0027
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关键词
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土壤
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土壤水势
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含水量
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模型
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Logistic方程
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地址
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1.
江苏大学农业装备工程学院, 现代农业装备与技术教育部重点实验室;;环境地球化学国家重点实验室环境生物科学和技术研究中心, 江苏, 镇江, 212013
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江苏大学农业装备工程学院, 现代农业装备与技术教育部重点实验室, 江苏, 镇江, 212013
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1674-8530 |
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学科
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农业工程 |
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基金
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江苏高校优势学科建设工程
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文献收藏号
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CSCD:5975583
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