Decomposition patterns of leaf litter of seven common canopy species in a subtropical forest: N and P dynamics
Decomposition patterns of leaf litter of seven common canopy species in a subtropical forest: N and P dynamics
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DOI：
10.1007/s11104-004-8069-5
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发表时间：
2005-06
期刊：
影响因子：
4.9
通讯作者：
Xiaoniu Xu;E. Hirata
中科院分区：
文献类型：
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作者：
Xiaoniu Xu;E. Hirata
凋落物分解，管理养分和C循环，是强烈的化学凋落物质量的影响。为了确定叶片分解速率的种间差异，并了解这种差异的化学基础，在日本冲绳亚热带万年青阔叶林中，采用凋落物袋技术对7种常见冠层树种的分解动态进行了2 a的调查。所研究的物种是研究区植被的代表，其化学凋落物质量差异显着。研究结束时的干物质损失量大小顺序为：总状叶红柳<宫城栎<夹竹桃<山矾<锥叶栲<木荷<虎皮楠。所有物种表现出一种模式，其特点是由一个快速的初始分解，其次是较低的速率，除了福特。灰绿色，其分解速率似乎相当恒定。在后期阶段，分解速率呈正相关的初始N和灰分含量和负相关的木质素含量，木质素：N，C：N，和C：P比。氮素和木质素含量或木质素与氮的比例的影响比其他品质参数强。有一个广泛的N和P浓度的模式，从净积累到分解的快速损失。N和P释放之间的相关性表明，在凋落物分解过程中，N和P的动态可能相互影响。物种的初始质量分析表明，C：P比值非常高（范围1639-3811），但N：P比值为28 - 56，表明该森林可能是磷限制。研究结果表明，P是凋落物分解和N、P动态的重要控制因子。
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 forD. glaucescenswhich 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.