生物覆盖对贵州山地杨树人工林钾素的影响  

Mulching Effect on Soil Potassium Content of Poplar Plantation in Upland Area of Guizhou Province

作　　者：谢宝东[1,2] 徐锡增[1] 方升佐[1] 刘久俊[1] 

机构地区：[1]南京林业大学资源与环境学院,江苏南京210073 [2]山东省水土保持与环境保育重点实验室,山东临沂270003

出　　处：《西南林学院学报》2011年第2期16-19,共4页Journal of Southwest Forestry College

基　　金：国家自然科学基金项目(30671671)资助;国家林业公益性行业科研专项项目(201004004)资助;山东省科技攻关项目(2009GG10007014)资助

摘　　要：将林地杂草白茅和凤尾蕨混合后按照0、2.5、5.0、7.5 kg/m2的覆盖强度进行山地杨树人工林土壤生物覆盖试验,测定土壤钾素动态,结果表明:土壤速效钾含量、根际速效钾含量和R/S值、杨树体内钾素含量均随覆盖强度增加而增加,又随覆盖后年限的延长而减小;不同覆盖强度对杨树各器官钾素含量的影响较为复杂;与其他处理相比,覆盖强度为7.5 kg/m2较利于土壤和杨树钾素养分的提高。The mixed mulching materials consisting of the cut waste of Imperata cylindrical var.major and Pteridium aquilinum var.latiuscukum was applied to poplar plantation in the upland area of Guizhou Province with 0,2.5,5.0 and 7.5 kg/m2 as the coverage intensity,and the dynamic change of soil potassium concentration in the poplar plantation soil was monitored.The results indicated that the available potassium content in the soil,the available potassium content in the rhizosphere soil,the R/S value of rhizosphere soil,and the potassium content inside the poplar trees all increased with the increment of mulching intensity,whereas the above discussed potassium contents decreased with time prolonging.Comparatively speaking,7.5 kg/m2 of mulching intensity was more beneficial to the promotion of soil potassium content in the poplar plantation in the upland areas of Guizhou Province.

关 键 词：生物覆盖 杨树人工林 钾含量 利用效率 

分 类 号：S714.6[农业科学—林学]