西藏土壤有机质和氮素状况及其影响因素分析  

Analysis on Status of Soil Organic Matter and N Nutrient and Their Influencing Factors in Tibet

作　　者：刘世全[1] 高丽丽[1] 蒲玉琳[1] 邓良基[1] 张世熔[1] 

机构地区：[1]四川农业大学资环学院,四川雅安625014

出　　处：《水土保持学报》2004年第6期54-57,67,共5页Journal of Soil and Water Conservation

基　　金：国家"863"计划项目(990140046)资助

摘　　要：根据西藏16个土类168个土壤剖面的分析资料,探讨土壤有机质和氮素状况及其影响因素。西藏土壤有机质>30g/kg和20～30g/kg的面积分别占39%和46%;其地理分布既有广阔高原面上的水平地带性变化,也有山地和深切河谷的垂直地带性变化。土壤有机质中活性腐殖质一般占30%～45%,以酸性土中的比例较大。土壤全氮>1 5g/kg,1 0～1 5g/kg和<1 0g/kg的面积分别占40%,44%和16%;碱解氮>150mg/kg和<90mg/kg的面积分别占36%和61%。全氮与有机质呈线性正相关;碱解氮与全氮、有机质呈非线性正相关,并与活性腐殖质有密切关系,它在部分土壤中还受有机质C/N的制约。Based on the analyzed data of samples gathered from 168 profiles under 16 soil great groups in Tibet, the status of soil organic matter (OM) , N nutrient and their influencing factors were studied. The results showed Soil OM contents which was>30 g/kg and 20～30 g/kg occupied 39% and 46% of the total area in Tibet, respectively. The distribution of soil OM showed the obvious geographical characteristics with the horizontal zones on the vast plateau and vertical zones in the mountains. Generally, the percentage of active humus of soil OM was from 30% to 45%, and it was comparatively higher in acid soils than in alkaline soils. The area of soil total nitrogen contents(TN) which were >1.5 g/kg,0～1.5 g/kg and <1.0 g/kg were 40%, 44% and 16% in Tibet, respectively. The area of soil available nitrogen contents(AN) which were>150 mg/kg and<90 mg/kg were 36% and 61% in Tibet, respectively. The relation between soil TN and OM was linear positive correlation, but the relations between soil AN and TN, OM were both nonlinear positive correlation. Moreover, AN had close relationship with active humus, and it was restrained by C/N of OM in part soil.

关 键 词：西藏 土壤有机质 氮素状况 影响因素 

分 类 号：S158.3[农业科学—土壤学]