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《Science of Sericulture》 2012-04
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An Analysis on Improvement Benefits of Hippophae rhamnoides and Morus L.Mixed Plantation to Soil of Iron Tailings

WANG Yan1 SHI Juan-Hua2 LI Chen-Guang1 ZHANG Li-Feng1 LI Yu-Ling1(1Agricultural University of Hebei,Baoding Hebei 071000,China;2Forestry Bureau of Yongnian County,Handan City,Handan Hebei 056000,China)  
Soil physical and chemical properties and nutrient content and distribution of Hippophae rhamnoides L.and Morus L.mixed plantation on iron tailings were determined to evaluate improvement benefits of artificial mixed plantation to soil of iron tailings.Compared with control new iron tailings,the bulk density and capillary porosity of soil under the mixed plantation had reduced by 5.85% and 5.04 percentage points respectively,air porosity and natural moisture content had increased by 10.97 and 1.35 percentage points respectively,and average relative water content in 0~40 cm soil layers had increased by 12.90 percentage points,all of which showed that the growth of plant root systems of the mixed plantation had brought an effective improvement to physical property of the original dense sandy soil of iron tailings.The mixed plantation had a remarkable effect on modifying soil alkalinity of iron tailings.Morus L.had a better effect on soil alkalinity modification than Hippophae rhamnoides L.The organic matter in soil under the mixed plantation had been significantly increased,being 7.22 times to that of the control new iron tailings.Soil organic matter content decreased with depth of soil layer,displaying certain surface aggregation tendency.Organic matter was mainly distri-buted in 0 ~ 20 cm soil layers.However,the organic matter content in soil under the mixed plantation was still quite low,being only 17.15% to that of soil under the natural hilly bush.The content of major available nutritional elements in soil under the mixed plantation was in the order of available Pavailable Kalkaline hydrolyzed N.The whole quantity of major elements was in the order of KPN.The content of total N,total P and total K in soil surrounding root system of Hippophae rhamnoides L.was higher than that of Morus L.respectively,while the average content of total Ca and total Mg in soil surrounding root system of Morus L.was slightly higher than that of Hippophae rhamnoides L respectively.The above results suggest that Hippophae rhamnoides L.and Morus L.mixed plantation could remarkably improve soil physical and chemical properties and increase soil nutrient contents.
【Fund】: 国家林业局“948”引进项目(No.2009-4-29)
【CateGory Index】: S725.2;S156
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