多伦县土壤营养元素有效态含量的影响因素研究

在对该区土壤进行全面调查、分析、评价的基础上，对影响土壤中元素有效态含量的因素如土壤类型、地貌类型、土地利用类型，以及砂化等进行讨论。结果表明，这些因素均影响到元素有效态含量。过度开垦和放牧是造成土壤沙化和肥力下降的主要原因。研究认为全理利用土地资源，实行退耕还草、还林、改善生态，以控制沙化和优化农、林、牧结构比，并结合配方施肥。则是提高粮食、牧草单产及经济效益的关键。

Factors influencing the availability of nutrients in the soil of Duolun County in mixed area of agriculture and pasturing

The organic matter content, and the availability of macro and micronutrients in 61 topsoil samples in Duolun County in the mixed area of agriculture and pasturing,North of China,were investigated The organic matter content, and the availability of nutrients differed among the types of soil, topography, and land use. Overuse of soil resources decreased the fertilities of soil, and caused the soil desertification, These results suggested that we should adjust the structures of land use, and fertilize the soil properly to control desertification, and increase the yields of the crops and grasses.