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| Effect of root distribution of different crops in salt-containing soil on soil water and salt |
| HOU Chenli1,2, TIAN Delong2, XU Bing2, LI Xianyue1 |
| 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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Received: 28 April 2018
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