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| Characteristics of root distribution of Hippophae rhamnoides L. and its improving effect on the forest soil on the ditch slope of soft sandstone area |
| DANG Xiao-Hong1, GAO Yong1, HONG Ji1, LUO Feng-Min1, GAO Jun-Liang2, LIU Yang1 |
| (1.College of Ecology and Environmental Science, Inner Mongolia Agricultural University, 010019, Hohhot;2.Desert Forestry Experimental Center of China Forestry Science Research Institute, 015200, Dengkou, Inner Mongolia: China) |
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Abstract patterns of roots affect not only the growth of the plant itself, but also soil conservation and soil improving. The paper studied the root distribution patterns of different plantation age of Hippophae rhamnoides L. in three site conditions on slopes using roots tracing method. Through measuring the soil physical and chemical properties in Hippophae rhamnoides L. forests, and compared with that on bare slopes, the improving effect of planting Hippophae rhamnoides L. on forest soil was analyzed. The results of the study show that: roots of Hippophae rhamnoides L. mainly distributed in the depth from 0 to 40 cm in soil on ditch slope in the soft sandstone area, in horizontal direction the roots could reach 137 cm.There was a close relationship between the numbers of first lateral root of Hippophae rhamnoides L. and microenvironment. If condition of soil moisture was better, the tiller ability of Hippophae rhamnoides L.root systems was stronger, and root was shorter. Root diameter of Hippophae rhamnoides L. decreased with soil depth and distance to standard strains. For the man-planted Hippophae rhamnoides L. forest on the soft sandstone slope, because of limit of soft sandstone the horizontal distribution of root on slope top is more developed. Since the soil thickness and fertility at slop bottom were good enough, the vertical distribution of root was apparently deeper than that at slope top. Planting Hippophae rhamnoides L. could increase soil moisture content and the soil porosity, and increase the mass fractions of available N, P, K and organic matter in soil.
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Received: 18 November 2011
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