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Numerical analysis of soil fertility degradation in the reclamation process of forest land on low hilly red soil

ZHANG Ming kui(Dept.of Soil Science and Agricultural Chemistry,Zhejiang Univ.,Hangzhou 310029,China)  
Numerical analysis method was used to study the soil fertility degradation in the reclamation process of forest land on low hilly red soil with cultivated time.It was found that fertility degradation of the soil after reclamation of forest land was mainly characterized by the decrease of organic matter and clay contents.It was suggested that increasing input of organic materials,weakening decrease rate of organic matter and controlling water and soil erosion was the key of preventing degradation of upland on low hilly red soil.The level of soil organic matter could be a criterion to evaluate fertility degradation of upland on low hilly red soil.
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