| 坐水播种时土壤临界含水率的确定 |
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| 引用本文： | 郭维东,夏桂敏,王晓刚,张杰华.坐水播种时土壤临界含水率的确定[J].灌溉排水学报,2003,22(4):12-13,21. |
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| 作者姓名： | 郭维东 夏桂敏 王晓刚 张杰华 |
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| 作者单位： | 1. 沈阳农业大学,辽宁,沈阳,110161
2. 鞍山市千山区水利局,辽宁,鞍山,112200 |
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| 基金项目： | 辽宁省博士起动基金资助项目 (2 0 0 2 10 40 ) |
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| 摘 要： | 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。
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| 关 键 词： | 坐水播种 土壤含水率 数学模型 |
| 文章编号： | 1000-646X(2003)04-0012-02 |
Critical Soil Moisture for Bed-irrigating Sowing |
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| GUO Wei-dong ,XIA Gui-min ,WANG Xiao-gang ,ZANG Jie-hua.Critical Soil Moisture for Bed-irrigating Sowing[J].Journal of Irrigation and Drainage,2003,22(4):12-13,21. |
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| Authors: | GUO Wei-dong XIA Gui-min WANG Xiao-gang ZANG Jie-hua |
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| Institution: | GUO Wei-dong 1,XIA Gui-min 1,WANG Xiao-gang 1,ZANG Jie-hua 2 |
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| Abstract: | Concept and determination method of critical soil moisture for bed-irrigating sowing was introduced. A mathematical model with soil water dynamics theory for computing the critical soil moisture was developed in this paper. Solves for the model were determined with iterative method. To a sample dryland soil in Chaoyang county, Liaoning province, computational result of critical soil moisture content for maize sowing is about 17.34% (gravity content), or 58.1% of field capacity. The result shows that a drought-fighting bed-irrigating sowing measure should be adopted where soil moisture content is lower than 17.34%. |
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| Keywords: | bed-irrigating sowing soil moisture mathematical model |
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