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首页> 外文期刊>Plant and Soil >Decomposition patterns of leaf litter of seven common canopy species in a subtropical forest: N and P dynamics.
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Decomposition patterns of leaf litter of seven common canopy species in a subtropical forest: N and P dynamics.

机译：亚热带森林中七个常见冠层物种的凋落物分解模式：N和P动力学。

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摘要

Litter decomposition, governing nutrient and C cycling, is strongly influenced by the chemical litter quality. In order to determine the interspecific variation in leaf decomposition rates and to understand the chemical basis for such variation, decomposition dynamics of seven common canopy species was investigated over 2 year using the litterbag technique in a subtropical evergreen broad-leaved forest on Okinawa Island, Japan. The species studied are representatives of the vegetation in the study area and differed significantly in their chemical litter quality. Dry mass loss at the end of study varied in the order: Distylium racemosum < Quercus miyagii < Rapanea neriifolia < Symplocos confusa < Castanopsis sieboldii < Schima wallichii < Daphniphyllum glaucescens. All species showed a pattern characterized by a rapid initial decomposition followed by lower rates except for D. glaucescens which decomposition rate appeared to be rather constant. In the late phase, decomposition rates were correlated positively to initial N and ash contents and negatively to lignin content, lignin:N, C:N, and C:P ratios. The effects of N and lignin content or lignin:N ratio were stronger than other quality parameters. There was a wide range in patterns of N and P concentrations, from a net accumulation to a rapid loss in decomposition. The correlation between N and P release suggests that N and P dynamics may have influenced each other during litter decomposition. Analysis of initial quality for species showed that the C:P ratios were extremely high (range 1639-3811) but the N:P ratios were from 28 to 56, indicating a likely P-limitation for this forest. Our results suggest that P is an important control of litter decomposition and N and P dynamics..
机译：凋落物分解（控制营养物和碳循环）受化学凋落物质量的强烈影响。为了确定叶片分解速率的种间变化并了解这种变化的化学基础，在日本冲绳岛的亚热带常绿阔叶林中，使用垃圾袋技术研究了7种常见冠层物种在2年内的分解动力学。 。所研究的物种是研究区域植被的代表，其化学凋落物质量差异显着。研究结束时的干物质损失按以下顺序变化：鼠尾草<栎属>宫古栎>鼠李草> Sym蒲>锥栗<希玛wallichii <锦葵。所有种均表现出特征，其特征是快速初始分解，然后以较低的速率降解，除了D. glaucescens，其分解速率似乎相当恒定。在后期，分解速率与初始氮和灰分含量呈正相关，与木质素含量，木质素：N，C：N和C：P比率呈负相关。氮和木质素含量或木质素：N比的影响要强于其他质量参数。 N和P浓度的模式范围很广，从净积累到分解的迅速损失。 N和P释放之间的相关性表明，N和P动力学可能在凋落物分解过程中相互影响。对物种初始质量的分析表明，C：P比率非常高（范围1639-3811），但N：P比率从28到56，表明该森林可能存在P限制。我们的结果表明，磷是凋落物分解以及氮和磷动力学的重要控制。

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