若尔盖高寒湿地土壤全氮空间分布特征  

Characteristics of spatial distribution of soil total nitrogen in Zoige alpine wetland

作　　者：马坤[1] 张颖[1] 唐素贤[1] 刘俊国[1] 

机构地区：[1]北京林业大学自然保护区学院,北京100083

出　　处：《生态学杂志》2016年第8期1988-1995,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(91425303;91325302);科技部国家国际科技合作专项项目(2012DFA91530);中组部青年拔尖人才支持计划项目资助

摘　　要：选取若尔盖高寒湿地（红原县和若尔盖县）作为研究区域,运用野外调查采样、室内分析与地理信息系统的空间分析方法,对土壤1 m深全氮的空间分布特征进行研究,以期为全球变化背景下高寒湿地氮循环研究提供支撑。结果表明,土壤全氮含量和密度具有垂直分异现象,呈现随土层深度的增加而降低的趋势,较高值出现在0~0.3 m土层,且显著高于0.3~1.0 m土层。水平分布上,土壤全氮密度具有较强的空间异质性。在0~1.0 m土层,研究区内土壤全氮总储量为62.6 Tg,平均全氮密度为3.8 kg·m^-3。常年淹水湿地0~1.0 m土层土壤平均全氮密度为4.0 kg·m^-3,全氮储量为29.2 Tg,约占研究区内土壤全氮总储量的46.7%。To improve our understanding of the nitrogen cycle in the alpine wetlands, this study chose Zoige alpine wetland （Hongyuan and Ruoergai counties） as study area and focused on spa- tial distribution of total nitrogen （TN） within soil layers （ 0- 1.0 m）, using the field investiga- tion, laboratory analysis and GIS spatial analysis method. TN was vertically differentiated. The TN concentration and TN density decreased with increasing soil depth, being significantly higher in the topmost 0.3 m soil layer than in the 0.3-1.0 m soil layer. Horizontally, the distribution of TN was heterogeneous. The TN stock totaled 62.6 Tg in the uppermost 1.0 m soil layer of the en- tire study area, of which 53.4% was held in the upper most 0.3 m soil layer, with an average TN density of 3.8 kg ·m^-3. The TN stock in the uppermost 1 m soil layer of permanently flooded wet- land totaled 29.2 Tg, accounting for 46.7% of the TN stock in the entire study area, with an average TN density of 4.0 kg ·m^-3.

关 键 词：全氮 垂直分布 水平分布 储量 若尔盖 

分 类 号：S153.6[农业科学—土壤学]