期刊
ECOLOGICAL RESEARCH
卷 27, 期 1, 页码 69-75出版社
WILEY
DOI: 10.1007/s11284-011-0868-6
关键词
Aboveground-belowground interaction; Inorganic nitrogen; Insect-plant interaction; Parasa consocia; Salix gilgiana
类别
资金
- Kyoto University [A06]
- [B-20370010]
Although there is a growing body of evidence that herbivorous insects have a significant impact on decomposition and soil nutrient dynamics through frass excretion, how mixtures of leaf litter and insect frass influence such ecosystem processes remains poorly understood. We examined the effects of mixing of leaf litter and insect frass on decomposition and soil nutrient availability, using a study system consisting of a willow, Salix gilgiana Seemen, and a herbivorous insect, Parasa consocia Walker. The chemical characteristics of insect frass differed from those of leaf litter. In particular, frass had a 42-fold higher level of ammonium-nitrogen (NH4+-N) than litter. Incubation experiments showed that the frass was decomposed and immobilized with respect to N more rapidly than the litter. Furthermore, litter and frass mixtures showed non-additive enhancement of decomposition and reduction of NH4+-N, depending on the litter-frass mixing ratio. These indicate that, while insect frass generally accelerated decomposition, the effect of frass on soil nutrient availability was dependent largely on the relative amounts of litter and frass.
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