Cumulative effects of nitrogen additions on litter decomposition in three tropical forests in southern China
Cumulative effects of nitrogen additions on litter decomposition in three tropical forests in southern China
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氮添加对中国南方三种热带森林凋落物分解的累积效应
DOI：
10.1007/s11104-007-9339-9
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发表时间：
2007-08-01
期刊：
影响因子：
4.9
通讯作者：
Wang, Hui
中科院分区：
文献类型：
--
作者：
Fang, Hua;Mo, Jiangming;Wang, Hui
在中国热带地区的松树（马尾松）林、松阔叶混交林（混合）和成熟季风常绿阔叶林（成熟）三种森林类型中进行了氮（N）添加处理的田间规模试验。两种落叶层，木木Chardn。 ＆冠军。经过两年多的连续添加氮后，使用垃圾袋技术对栲树和栲树进行了研究。本研究的目的是了解氮添加对热带森林凋落物分解的累积影响，并确定氮添加的初始影响是否随时间变化。结果表明，成熟森林中的落叶分解速度明显快于混交林或松林。 12 个月分解后剩余质量的平均分数为：两窝成熟松树 (0.22) < 混合松树 (0.50) < 松树 (0.51)。氮添加显着抑制了松林和成熟林中的凋落物分解，但对混交林没有显着影响。这些结果表明，氮沉降对凋落物分解具有显着的累积效应。
A field-scale experiment with nitrogen (N) addition treatments was performed in three forest types - a pine (Pinus massoniana Lamb.) forest, a pine-broadleaf mixed forest (mixed) and a mature monsoon evergreen broadleaf forest (mature) - in tropical China. Two kinds of leaf litter, Schima superba Chardn. & Champ. and Castanopsis chinensis Hance, were studied using the litterbag technique after more than 2 years of continuous N additions. The objective of this study was to understand the cumulative effect of N addition on litter decomposition in the tropical forests and to determine if the initial effects of N addition changes over time. Results indicated that leaf litter decomposition was significantly faster in the mature forest than in the mixed or pine forests. The mean fraction of mass remaining after 12-months of decomposition was: mature (0.22)< mixed (0.50)< pine (0.51) for the two litters. Nitrogen addition significantly depressed litter decomposition in the pine forest and the mature forest, but had no significant effect in the mixed forest. These results suggest that N deposition has significant cumulative effect on litter decomposition.