模拟氮沉降增加对土壤微生物量的影响

被引:17
作者
赵玉涛 [1 ]
韩士杰 [1 ]
李雪峰 [1 ]
胡艳玲 [2 ]
机构
[1] 中国科学院沈阳应用生态研究所
[2] 中国科学院研究生院
关键词
阔叶红松林; 次生杨桦林; 氮沉降; 微生物量;
D O I
10.13759/j.cnki.dlxb.2009.01.016
中图分类号
S714 [森林土壤学];
学科分类号
0903 ; 090301 ;
摘要
采用模拟方法研究了天然阔叶红松林和天然次生杨桦林中土壤微生物碳、氮对大气氮沉降升高的响应。林地控制施氮量分别为:对照(0)、低氮(25 kg.(hm2.a)-1)和高氮(50 kg.(hm2.a)-1)。施氮后的第一个生长季,生长初期(5月)、生长旺季(7月)和生长末期(9月)的观测研究表明:氮沉降增加对微生物C、N的影响因森林类型和时间不同而存在显著差异。由此表明,1 a的施氮试验并没有使土壤氮达到饱和状态,但是短期的施氮可以在某些月份内显著影响土壤微生物C、N及其微生物m(C)∶m(N)。
引用
收藏
页码:49 / 51
页数:3
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