Negative effects of litter richness on root decomposition in the presence of detritivores

Negative effects of litter richness on root decomposition in the presence of detritivores
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在食腐动物存在的情况下,凋落物丰富度对根分解的负面影响

DOI:
10.1111/1365-2435.13057
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发表时间:
2018-04
期刊:
Functional Ecology
影响因子:
--
通讯作者:
Keping Ma
Keping Ma
中科院分区:
其他
文献类型:
--
作者:
Yinong Li;Xi Chen;G. F. Ciska Veen;Nico Eisenhauer;Yu Liang;Xiaomei Zhou;Naili Zhang;Keping Ma

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1.分解是许多生态系统功能的基础。虽然越来越多的研究已经测试了凋落物丰富度如何影响地上植物器官的分解,知识仍然有限的根混合物的分解。在这里,我们在亚热带森林的实地实验,调查如何在根凋落物混合物(风干新鲜细根)的物种丰富度影响根凋落物材料的分解。2.基于资源互补性的概念,我们假设,根凋落物分解的速度更快,丰富的根凋落物混合物的增加。此外,我们预计食草动物的存在,以修改质量损失的根丰富度的影响,因为食草动物可能会经历自下而上的影响,从特定的植物物种,并可能影响微生物分解群落。3.在没有食草动物存在的情况下,根凋落物混合物的丰富度对质量损失没有影响。在食草动物的存在下,所有的根凋落物类型分解速度更快。值得注意的是,食草动物的积极影响是强在低根凋落物丰富度比在高根凋落物丰富度,特别是在分解的早期阶段(前两个采样点)时,凋落物质量损失约为两倍,在低根凋落物丰富度相比,在高根凋落物丰富度。在最后一个采样点测得的根真菌群落的组成并没有显着不同的根丰富度水平,并没有受到食草动物的存在。4.Synthesis.我们的研究结果表明,食草动物修改根凋落物多样性和根凋落物分解在亚热带森林生态系统之间的关系。这突出了不同营养生物之间的级联效应对生态系统功能的重要性。
1.Decomposition is a vital process underlying many ecosystem functions. Although a growing number of studies have tested how litter richness affects the decomposition of aboveground plant organs, knowledge remains limited about the decomposition of root mixtures. Here, we used a field experiment in a subtropical forest to investigate how species richness in root litter mixtures (air-dried fresh fine roots) affects the decomposition of root litter material. 2.Based on the concept of resource complementarity, we hypothesized that root litter would decompose faster as the richness of the root litter mixture increased. In addition, we expected the presence of detritivores to modify the effect of root richness on mass loss, because detritivores might experience bottom-up effects from specific plant species and might affect microbial decomposer communities. 3.We found that the richness level of root litter mixtures did not affect mass loss in the absence of detritivores. In the presence of detritivores, all root litter types decomposed faster. Notably, the positive effect of detritivores was stronger at low root litter richness than at high root litter richness, particularly during the early stages of decomposition (the first two sampling points) when litter mass loss was roughly double at low root litter richness compared to that at high root litter richness. The composition of the root fungal community measured at the last sampling point did not differ significantly across root richness levels, and was not affected by the presence of detritivores. 4.Synthesis. Our findings demonstrate that detritivores modify the relationship between root litter diversity and root litter decomposition in subtropical forest ecosystems. This highlights an importance of cascade effects between different trophic organisms on ecosystem functioning.
DOI: 10.1046/j.1461-0248.2003.00454.x
发表时间: 2003-06-01
期刊: ECOLOGY LETTERS
影响因子: 8.8
作者:
Smith, MD;Knapp, AK
通讯作者: Knapp, AK
DOI: 10.1007/978-3-642-38821-7_8
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作者:
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DOI: --
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影响因子: 9.3
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DOI: 10.2307/3546757
发表时间: 1999-11
期刊: Oikos
影响因子: 3.4
作者:
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中国亚热带森林次生林演替过程中的群落聚集
DOI: 10.1890/09-2172.1
发表时间: 2011-02-01
影响因子: 6.1
作者:
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通讯作者: Schmid, Bernhard