Study On The Composition And Phytoavailability Of Soil Iron With Different Tea Plantation Age In Mingshan County

To explore rice fields into the tea garden soil iron distribution and its effectiveness in Mingshan, In this study, life of the plant tea tea garden soil as the research object, not tea growing paddy soil without reference with the field survey and within the industry analysis approach. The paper studies the plant tea lives and land use change on the various forms of the iron content of the tea garden soil, soil physical and chemical properties of various forms of iron in the soil and its effectiveness of tea garden soil to provide a basis for the rational use and management of soil resources.The result shows:1、Total iron content in the tea garden soil (25.86g/kg～27.88g/kg), free iron oxide content (7.91g/kg～8.86g/kg), crystalline iron (4.29to6.36) total iron (27.79g/kg), free iron oxide content (9.22g/kg) and crystalline iron (6.46) lower than the reference soil samples in paddy soil. Tea Garden Soil amorphous iron oxide, the complex state iron content in plant time which content is less than paddy soil in late time.2、the time distribution characteristics of various iron forms in the tea garden soil:tea garden soil iron, free iron oxide and crystalline iron is reduced with the prolongation of the plant tea, a significant negative correlation with plant tea life, connected with tea of soil iron absorption. The tea garden soil have amorphous iron oxide, chelated iron increased with the extension of planting tea time, and life of planting tea have a significant positive correlation with amorphous iron oxide and chelated iron,3、The space distribution characteristics of various forms of iron in tea garden soil:on the0-60cm soil, each tea garden soil in different planting tea life,amorphous iron oxide, chelated iron Table poly, showing a decreasing trend with the increase of soil depth, and free iron oxide showed gathered down the law.4、Tea garden soil iron content range is28.09mg/kg～38.79mg/kg, lower than the effective iron content of the paddy soil. With the extension of the plant tea time, tea garden soil iron content increased, the available iron in the soil profile, showing a decreasing trend with soil depth. Soil pH, organic matter and cation exchange capacity of the soil have large influence by stepwise regression analysis, which found that in tea garden soil stereotypes oxidation state of iron and iron complex state of soil available iron supply form of tea plays an important role for iron.5、The soil in various of iron forms is mainly affected by factors such as soil pH, organic matter, CEC and available phosphorus. Correlation analysis showed that soil amorphous iron oxide, iron and organic matter content of the complex state have a significant positive correlation, organic matter can increase the degree of activation of the iron oxide; tea garden soil amorphous iron oxide, phase of activation,the soil pH, have a negative correlation. Soil CEC chelated iron, amorphous iron oxide, active iron content was significantly positively related.Soil available phosphorus and amorphous iron oxide, and activation was significantly positively correlated.