拉萨市周边大棚土壤有机质含量评价

摘要

[Objective] To study oil organic matter content in greenhouses around Lhasa City.[Method] With greenhouses in the main counties around Lhasa as research objects,the samples were analyzed by the method of potassium dichromate oxidation and sulfuric acid digestion.[Result] The content of organic matter in different soil layers in Lhasa greenhouses was different.The content of organic matter in deep soil was relatively low.The contents of soil organic matter in greenhouses were different in different cultivation ways.In the same soil layer,the organic matter content in ordinary greenhouse was relatively lower than greenhouse.Soil organic matter content below the critical value (20.00 g/kg) accounted for 61.33% of soil samples,and only 10.64% at higher levels (≥30.00 g/kg).The content of soil organic matter in different greenhouses was Dazi County>Doilungdêqên County>Qushui County.[Conclusion]The content of soil organic matter in the surrounding greenhouses of Lhasa is mainly medium-low level,and is middle-fertility soil.%[目的]分析拉萨市周边大棚土壤有机质含量.[方法]以拉萨市周边主要县区的大棚为研究对象,采用重铬酸钾氧化-硫酸消化法对土壤样品进行测定.[结果]拉萨市周边大棚中不同土层有机质含量存在一定差别,深层土壤中有机质含量相对较低;不同栽培方式大棚中土壤有机质含量不同,与温室大棚相比,相同土层普通大棚有机质含量相对较低.土壤有机质含量低于临界值(20.00g/kg)土样占61.33%,处于较高水平(≥30.00g/kg)仅为10.64%.不同县区大棚土壤有机质含量由高到低依次为达孜县、堆龙德庆县、曲水县.[结论]拉萨市周边大棚土壤有机质含量以中低水平为主,为中低等肥力土壤.