中亚热带主要树种凋落叶在杉木人工林中分解及氮磷释放过程

生态学杂志

中亚热带主要树种凋落叶在杉木人工林中分解及氮磷释放过程

仲米财^1，2,3,王清奎^1,2**,高洪²,于小军²

（¹森林与土壤生态国家重点实验室，中国科学院沈阳应用生态研究所，沈阳 110164； ^2中国科学院会同森林生态实验站， 湖南会同 418307； ^3中国科学院大学，北京 100049)

出版日期:2013-07-10 发布日期:2013-07-10

Decomposition and nitrogen- and phosphorus release of leaf litters from main tree species in a mid-subtropical forest.

ZHONG Mi-cai^1，2,3, WANG Qing-kui^1,2**, GAO Hong², YU Xiao-jun²

(¹State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China; ^2 Huitong Experimental Station of Forest Ecology, Chinese Academy of Sciences, Huitong 418307, Hunan, China; ³University of Chinese Academy of Sciences, Beijing 100049, China)

Online:2013-07-10 Published:2013-07-10

摘要/Abstract

摘要： 采用分解网袋法研究了马尾松(Pinus massoniana)、桤木(Alnus cremastogyne)、木荷(Schima superba)、青冈(Cycloblanopsis glauca)等树种凋落叶在21年生杉木人工林内的分解速率和养分释放过程。经过13个月的分解实验，4种供试凋落叶以青冈分解最快，质量失重率为33.5%，其次为桤木和木荷，马尾松分解最慢，其质量失重率仅为29.9%。4种凋落叶分解50%和95%所需要的时间分别为21～26个月和94～112个月。在凋落叶分解过程中，除桤木凋落叶中氮含量下降外，其他3种凋落叶的氮含量均增加，但凋落叶的C/N均降低；在凋落叶分解的前3个月，凋落物中磷含量快速下降，此后变化很小，C/P呈增加趋势。在凋落叶分解过程中，马尾松凋落叶对氮素表现为固持作用，而其他3种凋落叶对氮素表现为净释放，4种凋落叶的磷素均表现为净释放。4种供试材料中桤木较适合与杉木混交种植。

关键词: 森林更新, 可溶性有机质, 芳香化指数, 腐殖化指数, 荧光光谱

Abstract:

By using the standard litter-bag method, an experiment was conducted to study the decomposition rate and the nitrogen (N) and phosphorus (P) release processes of leaf litters derived from Pinus massoniana, Alnus cremastogyne, Schima superba, and Cycloblanopsis glauca in a 21-year-Cunninghamia lanceolata forest. By the end of the experiment (13 months incubation), C. glauca litter had the highest decomposition rate, with 33.5% of mass loss, followed by A. cremastogyne and S. superba, and P. massoniana had the lowest decomposition rate, with 29.9% of mass loss. The time for 50% and 95% of the mass loss of the litters from the four tree species ranged from 21 to 26 months and from 94 to 112 months, respectively. During the decomposition, the N concentration in A. cremastogyne litter decreased, whereas that in the other tree species litters increased. The P concentration in the litters decreased rapidly at the first three months of decomposition, and then varied insignificantly. During litter decomposition, the ratio of carbon (C) to N decreased, while the ratio of C to P increased. C. glauca, A. cremastogyne, and S. superba litters had net N release, but P. massoniana litter had N sequestration. In terms of P, the litters from the four tree species had net release during decaying. Among the four tree species, A. cremastogyne was more appropriate to be mixed planted with C. lanceolata.

Key words: forest regeneration, fluorescence spectra, humification index., dissolved organic matter, aromatic index

仲米财1，2,3,王清奎1,2**,高洪2,于小军2. 中亚热带主要树种凋落叶在杉木人工林中分解及氮磷释放过程[J]. 生态学杂志.

ZHONG Mi-cai1，2,3, WANG Qing-kui1,2**, GAO Hong2, YU Xiao-jun2. Decomposition and nitrogen- and phosphorus release of leaf litters from main tree species in a mid-subtropical forest.[J]. cje.

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