河岸带落叶松林土壤氮素空间格局研究

通过对庞泉沟河岸带落叶松林的土壤氮素空间格局进行分析,了解河岸带全氮、铵态氮、硝态氮的储量以及氮素的空间格局,为河岸带对河流氮素的净化研究提供基础数据。结果表明：1）土壤表层氮素含量较高,土壤中全氮、铵态氮、硝态氮空间异质性明显,并且氮素在土壤层之间、高地连续体上存在不规则的垂直格局和水平格局。2）在高地连续体上,河岸带土壤全氮与硝态氮呈显著正相关（r=0.613）,全氮与铵态氮呈正相关（r=0.114）,全氮与与河岸带宽度呈负相关（r=-0.075）,铵态氮与硝态氮呈负相关（r=-0.004）。土壤氮素格局受多因素影响,氮素的形态与含量主要受地形、林分、降水以及土壤理化性质等因素的综合影响。

Spatial Pattern of Soil Nitrogen in the Riparian Zone of Larch Forest

Through analyzing the spatial pattern soil nitrogen in the riparian zone of larch forest in the Pangquangou Nature Reserve and understanding the reserves and spatial pattern of total nitrogen （TN）, ammonium nitrogen （AN） and nitrate ni- trogen （ NN）, this article provides a data for research of riparian zone of river nitrogen purification. Results show that ： （ 1 ） Surface soil nitrogen content is higher. There is obvious spatial heterogeneity among NN, AN and NN, meanwhile existing irregular pattern of the vertical structure and level irregular ; （ 2 ） In the highlands continuum, there is significant positive correlation between TN and NN of soil （r =0. 613）, negative correlation between TN and AN of soil （r =0. 114）, negative correlation between TN and the wide of riparian zone （ r = - 0. 075 ）, negative correlation between AN and NN （ r = - 0. 004）. The nitrogen pattern of soil is influenced by multiple factors. The form and content of soil is influenced through comprehensive effects such as topography, plantation, precipitation and physical and chemical properties of soil.