广元核桃林地土壤肥力诊断与综合评价

Diagnosis and Integrated Evaluation on Soil Fertility of Walnut Woodlands in Guangyuan

为探明广元市核桃林地土壤的肥力状况,进一步指导广元市核桃丰产栽培的施肥管理,采用土壤肥力单项分级指标进行诊断分析、修正的内梅罗指数进行综合肥力评价。结果表明,广元核桃林地土壤p H值总体偏碱性,全N含量较丰富,部分土壤有效P、速效K、有效Fe缺乏,多数土壤有机质、有效Zn、有效B、有效Cu、有效Mn缺乏。核桃林地土壤肥沃程度总体处于较低水平,黄壤土类有效B、有效Cu、有效Mn缺乏,紫色土类速效K、有效Fe、有效Zn、有效B、有效Cu、有效Mn缺乏,黄壤肥沃程度高于紫色土。建议增施有机肥,配合施用无机肥,培肥土壤。

In order to find out the soil fertility status of the major walnut lands and further guide the fertilization management of abundant walnut cultivation in Guangyuan,the individual indicators of soil fertility was diagnosed and evaluated with modified Nemoro Index.The results indicated the soils of major walnut forests in Guangyuan was rich in total N,and the soil p H was generally alkaline;some soils lacked available P,available K,available Fe;most soils lacked organic matter,available Zn,available B,available Cu,available Mn.The soil fertility of walnut forests was generally at low level.Yellow soils lacked available B,available Cu,available Mn.Purple soils lacked available K,available Fe,available Zn,available B,available Cu,available Mn.Yellow soil was more fertile than purple soil.The results suggested to fertilize the soil by increasing the application of organic fertilizer in combination with inorganic fertilizer.