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。
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.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第7期1653-1659,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31070436)
国家重点基础研究发展计划项目(2012CB416905)资助
关键词
凋落叶
质量残余率
养分释放
leaf litter
mass remaining rate
nutrient release.
