若尔盖高寒湿地土壤全氮空间分布特征

发布时间：2018-03-24 21:18

本文选题：全氮　切入点：垂直分布　出处：《生态学杂志》2016年08期

【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%。
[Abstract]:In this paper, the spatial distribution characteristics of total nitrogen in 1m deep soil were studied by using field survey, indoor analysis and GIS spatial analysis method. The study was carried out on the high cold wetland (Hongyuan County and Ruoergai County) in Ruoergai, and the spatial distribution of total nitrogen in the soil was studied by using the methods of field investigation, indoor analysis and GIS. The results showed that the total nitrogen content and density of the soil had vertical differentiation phenomenon, which decreased with the increase of soil depth, and the higher value appeared in 0 0. 3 m soil layer. In horizontal distribution, the total nitrogen density of the soil has a strong spatial heterogeneity, and in the 0 ~ 1.0 m soil layer, the total nitrogen density of the soil is higher than that of the 0 ~ (3) ~ (10) m soil layer. The total nitrogen storage and average total nitrogen density were 62.6 Tg and 3.8 kg m ~ (-3) respectively. The average total nitrogen density was 4.0 kg m ~ (-3) and the total nitrogen storage was 29.2 Tg in 1.0 m soil layer of perennial flooded wetland, which accounted for 46.7% of the total soil total nitrogen reserves in the study area.
【作者单位】：北京林业大学自然保护区学院;
【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
【分类号】：S153.6

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