施氮量对大兴安岭白桦次生林土壤氮矿化的影响  

Effects of Nitrogen Deposition on Soil Nitrogen Mineralization of Betula platyphylla Forest in Daxing'an Mountains

作　　者：包翔[1] 包秀霞[2] 刘星岑 

机构地区：[1]内蒙古农业大学,呼和浩特010018 [2]呼和浩特民族学院

出　　处：《东北林业大学学报》2015年第7期78-83,共6页Journal of Northeast Forestry University

基　　金：内蒙古自治区自然科学基金项目(2013MS0516);内蒙古自治区科技计划项目(20130438)

摘　　要：以大兴安岭白桦天然次生林为研究对象,分析施氮量对土壤氮矿化的影响。结果表明,白桦次生林土壤中铵态氮、硝态氮和有效氮质量分数在生长季间存在显著差异。总体上,土壤中有效氮素质量分数在7月份最高,5月份最低。白桦次生林土壤中铵态氮、硝态氮和有效氮质量分数均随着氮沉降量的增加而增加;同时氮沉降也显著增加了土壤氨化速率、硝化速率和氮矿化速率,其中氨化速率的增幅大于硝化速率的增幅。不同施氮处理下,净矿化速率与土壤有机碳质量分数间的相关性比与全氮质量分数间更为密切。In a natural secondary forest of Betula platyphylla in Daxing＇ an Mountains, we studied the effects of nitrogen deposi- tion on soil nitrogen mineralization. The contents of NHa-N, NO3 -N and available N were significant differences among the growing seasons. Available N content was the highest on July and the lowest on May. The contents of NH4-N, NO3-N, available N, soil ammonification rate, nitrification rate and nitrogen mineralization rate were significantly increased with the increasing of N deposition. The ammonification rate of increase was greater than the nitrification rate. Under different N contents, the correlation ratio between the soil organic carbon and total N net mineralization rate was higher than total N.

关 键 词：施氮量 大兴安岭 白桦次生林 土壤氮矿化量 土壤氮矿化速率 

分 类 号：S714.2[农业科学—林学] S792.153