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坐水播种时土壤临界含水率的确定 被引量:7
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作者 郭维东 夏桂敏 +1 位作者 王晓刚 张杰华 《灌溉排水学报》 CSCD 北大核心 2003年第4期12-13,21,共3页
提出了坐水播种土壤临界含水率的概念和计算思路 ,根据已有的土壤水动力学理论 ,建立了计算这个临界含水率的二维数学模型 ,应用迭代法进行了求解。针对于朝阳县试验土壤 ,计算结果显示 ,播种玉米时土壤临界含水率为 17.34 %,为田间持... 提出了坐水播种土壤临界含水率的概念和计算思路 ,根据已有的土壤水动力学理论 ,建立了计算这个临界含水率的二维数学模型 ,应用迭代法进行了求解。针对于朝阳县试验土壤 ,计算结果显示 ,播种玉米时土壤临界含水率为 17.34 %,为田间持水率的 5 8.1%。若春播时 ,土壤含水率小于 17.34 %则需要采用坐水等措施进行抗旱播种。 展开更多
关键词 坐水播种 土壤临界含水率 土壤水动力学理论 数学模型
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Research status of soil frost-heave theory and frost-heave prediction models
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作者 XiangDong Zhang ShengYang Feng 《Research in Cold and Arid Regions》 2010年第1期82-86,共5页
Soil frost heaving is a complex physical, mechanical, and chemical synthesis process. This paper summarizes the frost-heaving theory over half a century, including the capillary theory, the frozen-fringe theory, and t... Soil frost heaving is a complex physical, mechanical, and chemical synthesis process. This paper summarizes the frost-heaving theory over half a century, including the capillary theory, the frozen-fringe theory, and those achievements recently made by scholars. In this paper, we also discus researching achievements of the soil-prediction model during the past 40 years, including the water-dynamics model, the rigid-ice model, the segregation-potential model, and the thermo-dynamic model. This summary and discussion will enable readers to understand the latest direction of research; it also summarizes the development of frost-heave prediction models and their advantages and shortcomings. 展开更多
关键词 frost heaving theory frost heaving model research status
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