混合凋落物分解非加和性效应研究进展

混合凋落物的分解是陆地自然生态系统中凋落物分解的主要形式。在许多混合凋落物的实验研究中,混合凋落物的实际分解速率往往偏离于基于单种组分凋落物计算的预期分解速率,产生非加和性效应。从混合凋落物实验的统计结果可以发现,大多数混合凋落物实验的质量损失、养分释放、微生物丰富度和活性都表现出非加和效应。混合凋落物实验不同设计方案可能会对实验结果造成影响,如各组分的初始比例、凋落袋、取样和各组分的分拣均会对实验结果造成影响。引起混合凋落物分解非加和性效应的因素是多方面的,文章从物理、化学和生物作用机制三方面综述了非加和效应的潜在机制。未来的研究应模拟野外环境下凋落物的实际分解,并与气候变化、生态恢复等研究相结合。

Progress on Non-additive Effects of Mixed Litter Decomposition

Decomposition of mixed litter is the main form of litter decomposition in natural terrestrial ecosystem.In many litter-mix experimental studies,the decomposition rate of litter-mix often deviates from that of all component species decaying alone,creating the non-additive effect.From the statistical analysis of litter-mix studies,non-additive patterns were observed in most mass loss,nutrient transfer,the abundance and activity of microorganism.The different experimental design may affect the result of experiment,such as loading ratio,litterbags,harvests and separation of litter components are all likely to affect the result.Factors in non-additive effect of mixed litter are various,from the mechanism in physics,chemistry and microorganism,the potential dynamics of non-additive effects were summarized.Future research should simulate field circumstance where mixed litter decomposed naturally and combine with climate change and ecological recovery.