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作 者 ：方运霆,莫江明,周国逸,Per Gundersen,李德军,江远清

期 刊 ：生态学报 2004年 24卷 11期 页码：2353~2359

关键词：氮沉降；森林土壤；铵态氮；硝态氮；鼎湖山；

Keywords:nitrogen deposition, forest soil, NH~+_4-N, NO~-_3-N, Dinghushan Biosphere Reserve,

摘 要 ：研究了南亚热带主要森林类型 (马尾松林、混交林和季风常绿阔叶林 )土壤有效氮含量对模拟氮沉降的初期响应。结果显示 :(1)马尾松林、混交林和阔叶林 0～ 10 cm和 10～ 2 0 cm两个土层有效氮 (铵态氮 +硝态氮 )含量总平均分别为 6 .2 4、6 .2 2和14 .77m g/kg,其中铵态氮占 4 5 .3%、4 8.7%和 14 .5 %。 (2 )外加氮处理使 3个森林两个土层的有效氮含量都在增加 ,但其影响程度取决于土层、氮处理水平、氮处理时间和森林类型。总体而言 ,0～ 10 cm土层略比 10～ 2 0 cm土层敏感 ;氮处理水平越高土壤有效氮增加越多 ;外加氮处理时间越长 ,处理样方与对照样方的差距越大 ;阔叶林的响应稍落后于马尾松林和混交林。

Abstract:The short-term responses of soil available nitrogen (N) to simulated N deposition were studied in subtropical China in three representative forest types of the Dinghushan Biosphere Reserve: a pine (Pinus massoniana) forest, a pine and broadleaf mixed forest, and a monsoon evergreen broadleaf forest. Dissolved NH_4NO_3 was sprayed monthly onto the forest floor of 10 m×20 m plots as equal applications over the whole year to simulate elevated N deposition. Four treatments were established within the broadleaf ...

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