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| 秸秆覆盖对玉米播种临界含水率影响的试验研究 | |
| 引用本文： | 王丽学,张玉龙,刘洪禄,石志强,刘冀. 秸秆覆盖对玉米播种临界含水率影响的试验研究[J]. 灌溉排水学报, 2004, 23(5): 50-52 |
| 作者姓名： | 王丽学 张玉龙 刘洪禄 石志强 刘冀 |
| 作者单位： | 1. 沈阳农业大学,水利学院,辽宁,沈阳,110161 2. 沈阳农业大学,土地与资源学院,辽宁,沈阳,110161 3. 北京市水利科学研究所,北京,100044 |
| 基金项目： | 北京市科委"九五"重大科技攻关项目(952360100),北京市科委新星计划资助项目(953811600) |
| 摘 要： | 通过室内外试验,对秸秆覆盖条件下播种的土壤临界含水率进行了试验研究。结果表明,在试验盆用塑料薄膜覆盖的条件下,测得玉米种子发芽出苗的土壤临界含水率为14%(体积含水率为0.2002cm3/cm3)。由室外试验建立秸秆覆盖条件下耕层土壤水分运动规律的数学模型,经过数值模拟得到田间播种的临界含水率:无覆盖的土壤重量含水率为14.89%(体积含水率为0.2129cm3/cm3),5cm厚麦秸覆盖的土壤重量含水率为14.36%(体积含水率为0.2054cm3/cm3),8cm厚麦秸覆盖的土壤重量含水率为14.57%(体积含水率为0.2083cm3/cm3)。这说明秸秆覆盖条件下播种的土壤临界含水率比裸地的低,秸秆覆盖有利于干旱地区的抗旱播种。 |
| 关 键 词： | 保护性耕作 秸秆覆盖 临界含水率 数值模拟 |
| 文章编号： | 1000-646X(2004)05-0050-03 |
| 修稿时间： | 2004-05-10 |
Research on the Soil Critical Moisture for Seeding Corn under Mulching |
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| WANG Li-xue,ZHANG Yu-long,LIU Hong-lu,SHI Zhi-qiang,LIU Ji. Research on the Soil Critical Moisture for Seeding Corn under Mulching[J]. Journal of Irrigation and Drainage, 2004, 23(5): 50-52 | |
| Authors: | WANG Li-xue ZHANG Yu-long LIU Hong-lu SHI Zhi-qiang LIU Ji |
| Affiliation: | WANG Li-xue~1,ZHANG Yu-long~2,LIU Hong-lu~3,SHI Zhi-qiang~1,LIU Ji~1 |
| Abstract: | Soil critical moisture for seeding under mulching was studied by indoor and outdoor experiments. The results show that soil critical moisture for germination of corn is 14% in experimental basin under the plastic film. Mathematical model for soil moisture movement of plough horizon under mulching is established by the outdoor experiments, and the critical moisture for seeding was achieved by using numerical simulation. The results indicate that soil critical moisture under mulching is lower than that without mulching, so the method of mulching benefits anti-drought seeding in arid areas. |
| Keywords: | conservative tillage mulching critical moisture numerical simulation |
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