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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%。
Taking the Ruoergai alpine wetland (Hongyuan County and Zoige County) as the research area, the spatial distribution characteristics of total nitrogen at 1 m deep in the soil were studied using the methods of field survey and sampling, indoor analysis and geographic information system (GIS) Under the background of alpine wetland nitrogen cycle to provide support. The results showed that the soil total nitrogen content and density had a vertical differentiation phenomenon, showing a trend of decreasing with the depth of soil layer increasing. The higher values appeared in 0 ~ 0.3 m soil layer and significantly higher than 0.3 ~ 1.0 m soil layer. The horizontal distribution of soil total nitrogen density has a strong spatial heterogeneity. In the 0-1.0 m soil layer, total nitrogen in the soil in the study area was 62.6 Tg and the average total nitrogen density was 3.8 kg · m-3. The average total nitrogen density of soil in 0-1.0 m soil layer in perennial wetlands was 4.0 kg · m-3, and the total nitrogen storage was 29.2 Tg, accounting for 46.7% of the total soil total nitrogen in the study area.