氮添加对樟树林生长的影响  

Effect of nitrogen addition on tree growth in subtropical Cinnamomum camphora forest

作　　者：郑威[1,2] 闫文德[1,2] 梁小翠[1,2] 张超[1,2] 赵亮生[1,2] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]南方林业生态应用技术国家工程实验室,湖南长沙410004

出　　处：《中南林业科技大学学报》2013年第4期34-37,共4页Journal of Central South University of Forestry & Technology

基　　金：国家"十二五"科技支撑项目(2011BAD38B0204);教育部新世纪优秀人才支持计划(NCET-10-0151);长沙市科技局项目(K1003009-61);中南林业科技大学青年科学研究基金重点项目(QJ2010008A)

摘　　要：采用人工氮添加试验,研究樟树林生长对不同氮添加水平(CK,0 g.m-2a-1;低氮LN,5 g.m-2a-1;中氮MN,15 g.m-2a-1;高氮HN,30 g.m-2a-1)的响应。结果表明:施氮处理促进了樟树林的胸径生长,LN、MN和HN处理的胸径生长率分别高出CK处理5.29%、4.82%和14.10%。氮添加对树高生长的影响表现为正效应。随着氮添加水平的增加,其对树高生长率的促进作用有微弱增加,LN、MN和HN处理林分胸径生长率分别高出CK处理,7.69%、8.23%和10.66%。施氮处理能明显促进低径阶林木的生长率,但对于中径阶林木起抑制作用。施氮处理增加了土壤中有效氮含量,LN、MN和HN处理土壤中总有效氮含量分别高出对照8.47%、31.60%和28.13%。By using a manual nitrogen addition method, the responses of growth Cinnamomum camphora forest growth to different nitrogen addition levels [CK, 0 g·m^（-2）a^（-1）; 5 g·m^（-2）a^（-1）（low nitrogen）; 15 g·m^（-2）a^（-1） （middle nitrogen）; 30 g·m^（-2）a^（-1）（high nitrogen）]. The results indicate that the nitrogen addition stimulated the growth of diameter at bread height（DBH）, the growth rate of DBH in LN, MN and HN plots were higher than that in CK plots separately by 5.29%, 4.82% and 14.10, the nitrogen addition with different levels had the positive effects on height growth of the trees; As the increase of nitrogen addition levels, the height growth rates have small increment, the DBH growth rates of LN, MN and HN plots were higher than that of the control＇s separately by 7.69%, 8.23% and10.66%, this showed that the nitrogen addition has an obvious enhancement for low diameter class trees, and had a negative effect on medium diameter class trees; the nitrogen addition treatments increased the content of available nitrogen in soil, the contents of available nitrogen in LN, MN and I-IN plots were higher than that in control plot by 8.47%, 31.60% and 28.13%.

关 键 词：樟树 生长率 氮添加处理 土壤有效氮含量 

分 类 号：S792.23[农业科学—林木遗传育种]