氮添加对樟树林和湿地松林树干呼吸的影响  

Effects of nitrogen addition on stem respiration in subtropical Cinnamomum camphora and Pinus massoniana forests

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》2012年第11期89-91,99,共4页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(200804030);国家自然科学基金项目(31070410);教育部新世纪优秀人才支持计划项目(NCET-10-0151);湖南省教育厅项目(湘财教字[2010]70号);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：人类活动造成了陆地生态系统氮输入的迅速增长,影响到森林生态系统碳循环。为揭示树干呼吸对高氮背景输入的响应,试验采用人工氮添加方法,研究不同氮输入条件(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)下亚热带樟树林、湿地松林的树干呼吸。结果表明:施氮会抑制樟树、湿地松林的树干呼吸,抑制作用大体表现为随施氮浓度增大而增强,但组间差异不显著;2种林分中的树干呼吸与土壤有效氮含量之间均无显著性关系。The nitrogen input to terrestrial ecosystems caused by human activity increased quickly, and has affected carbon cycle in forest ecosystem in many aspects. In order to reveal the response of stem respiration in Cinnamomum camphora（camphor） and Pinus massoniana（slash pine） stand to megadose nitrogen addition, the maninduced nitrogen addition experiments has been conducted. With different nitrogen addition doses, such as CK 0 g·m^-2a^-1 , LN, 5 g·m^-2a^-1; MN, 15 g·m^-2a^-1; HN, 30 g·m^-2a^-1, the stem respirations of camphor and slash pine forests in subtropical zone were determined. The results show that nitrogen addition inhibited the stem respiration in camphor and slash pine stand. Generally, the inhibition enhanced with the increase of nitrogen concentration, however, there is no significant difference between the nitrogen addition groups. The correlation between stem respiration and soil available nitrogen content was not significant.

关 键 词：樟树 湿地松 人工氮添加 树干呼吸 

分 类 号：S718.43[农业科学—林学] S792.23