| 含盐土壤不同作物根系分布对水盐分布的影响 |
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| 引用本文： | 侯晨丽,田德龙,徐冰,李仙岳.含盐土壤不同作物根系分布对水盐分布的影响[J].排灌机械工程学报,2018,36(10):1059-1064. |
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| 作者姓名： | 侯晨丽 田德龙 徐冰 李仙岳 |
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| 作者单位： | 1.内蒙古农业大学水利与土木建筑工程学院, 内蒙古 呼和浩特 010018; 2.中国水利水电科学研究院牧区水利科学研究所, 内蒙古 呼和浩特 010020 |
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| 摘 要： | 以相同含盐水平农田种植的紫花苜蓿与玉米为研究对象,研究根系分布变化对水盐分布的影响,为盐渍化土壤紫花苜蓿合理化种植提供参考.结果表明:整个生育期0~100 cm苜蓿平均土壤含水率显著低于玉米,深层60~100 cm土壤平均含水率比玉米低1.98%,其有效利用深层水分.土壤平均储盐量随时间上下波动逐渐减小,二者盐分分布规律不同,苜蓿8月前后浅层土壤盐分均匀分布,玉米主要体现在8月后期.苜蓿脱盐率显著高于玉米,生长后期苜蓿深层根系占比增大,根系分布密集土层,脱盐效果明显.苜蓿细根根长密度与HCO3-呈正相关关系,HCO3-随根长密度增大而增大,土壤中HCO3-可减缓K++Na+,Cl-增加,使作物土壤达到降盐效果.
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| 关 键 词： | 不同作物 水盐 根系分布 脱盐率 降盐效果 |
| 收稿时间： | 2018-04-28 |
Effect of root distribution of different crops in salt-containing soil on soil water and salt |
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| HOU Chenli,TIAN Delong,XU Bing,LI Xianyue.Effect of root distribution of different crops in salt-containing soil on soil water and salt[J].Journal of Drainage and Irrigation Machinery Engineering,2018,36(10):1059-1064. |
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| Authors: | HOU Chenli TIAN Delong XU Bing LI Xianyue |
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| Institution: | 1.Inner Mongolia Agricultural University, Water Conservancy and Civil Engineering College, Hohhot, Inner Mongolia 010018, China; 2.Hydroelectric and Water Conservancy Science Institute, China′s Scientific Research Institute in Pastoral Areas of Water Conservancy, Hohhot, Inner Mongolia 010020, China |
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| Abstract: | After farmlands adjusted the planting structure, the root distribution of different crops affec-ted water salt and vertical distribution. We took alfalfa and maize planted in the same saline soil as the research objects in this paper and discussed the relationship between soil water, salt and root distribution in an attempt to provide a reference for rationalized cultivation of alfalfa in saline soil. The results showed that the average soil moisture content of alfalfa at 0-100 cm is significantly lower than that of maize in the whole growth period, and the average soil moisture content of it at the depth of 60-100 cm is 1.98% lower than that of maize, which effectively utilized deep water. The average salt accumulation in the soil decreases gradually with time, and their salt distribution is different. The salt content of alfalfa in the shallow soil is evenly distributed around August, but that of maize appears mainly in late August. The salt removal rate of alfalfa is significantly higher than that of maize. The proportion of alfalfa deep root system in the late growth stage increases, and the soil layer is densely distributed in the roots, its desalination is obvious. The root length density of alfalfa fine roots is positively correlated with HCO-3, and HCO-3 increases with the increase of root length density. HCO-3 in soil can reduce the increase of K++Na+ and Cl-, which causes the desalination of the crop soil. |
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| Keywords: | differeat crops water salt root distribution desalination rate salt reduction effect |
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