食碎屑动物通过摄食更多高质量的凋落物促进混合分解效应

Detritivores accelerate litter mixture decomposition effect via greater consumption of high quality litter

为探究凋落物混合对凋落物分解速率的影响以及食碎屑动物在凋落物混合分解中的作用,利用室内微宇宙试验,研究了食碎屑动物(等足类)对化学质量差异较大的两种凋落物(香樟和白兰)混合分解的影响。结果表明:经过100 d的分解,凋落物混合分解的平均分解率为52.1%,小于白兰凋落物的平均分解率(62.6%),显著大于香樟凋落物的平均分解率(33.6%)。添加等足类动物显著提高了凋落物的分解速率,香樟凋落物、白兰凋落物及两者混合的分解率分别提高14.4%、20.1%、22.1%。没有等足类动物参与凋落物混合分解时,混合分解效应不显著,等足类动物的参与显著促进了凋落物的混合分解效应,混合效应值为8.6%。食碎屑动物不仅提高了凋落物分解速率,还通过摄食更多化学质量更高的凋落物促进凋落物的混合分解效应。

To explore the mixing effect of litter decomposition and the role of detritivores,we conducted a laboratory⁃based microcosm experiment to study the influence of detritivores on litter mixture decomposition by using two litter species with contrasting quality,i.e.,Cinnamomum camphora and Michelia×alba,and a detritivore(isopoda).After 100 days incubation,the decomposition rate of litter mixture was 52.1%,slower than that of M.alba(62.6%)and significantly faster than that of C.camphora(33.6%).The addition of isopods significantly increased litter decomposition rate,with C.camphora,M.alba,and the mixture increased by 14.4%,20.1%and 22.1%,respectively.There was no significant mixing effect without isopods.Adding isopods significantly promoted the mixing effect of litter decomposition,with a value of the litter mixture decomposition effect of 8.6%.The detritivores increased litter decomposition rate and mixing effect through increasing consumption of litter with better quality.