Changes in the abundance and species diversity of Collembola community along with dwarf bamboo density gradient in a mountainous temperate forest of Japan
Changes in the abundance and species diversity of Collembola community along with dwarf bamboo density gradient in a mountainous temperate forest of Japan
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DOI：
10.1016/j.apsoil.2022.104606
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发表时间：
2022-07-27
影响因子：
4.8
通讯作者：
Katayama, Ayumi
中科院分区：
文献类型：
--
作者：
Hishi, Takuo;Kawakami, Erika;Katayama, Ayumi
林下植被在森林生态系统中发挥着重要的作用，它提供了免受土壤物理化学胁迫或干扰的保护。因此，这种类型的植被可能有助于维持土壤的生物多样性和功能。然而，林下退化对土壤动物群落的影响还不是很清楚。研究了寒温带日本落叶林林下矮化竹密度下降对土壤弹尾类群落组成的影响，通过比较划分的群落相异度指数和特征组成来检测林下退化下群落的形成过程。对于弹尾目动物群落的物种丰富度和多样性，在所有测量的环境特征中，竹子密度与矮化竹子密度的单峰二次模型为最佳模型，而弹尾虫丰度与矮化竹子密度的线性负相关关系为最佳模型。对于弹尾目动物的性状组成，虽然选择了土壤碳和硬度的模型，但没有选择矮秆竹密度模型。群落间差异越大，群落不同程度的嵌套性成分越大，而更替成分差异不显著。这表明，矮化竹密度的降低可能导致整个弹尾目群落生态位空间的缩小。在中高密度的矮化竹中，高密度的矮化竹降低了弹尾虫群落的物种多样性，而丰度仍有所增加，这可能是由于在高林下和枯枝落叶盖度较低的干扰生境条件下，优势种八叶竹对群落的竞争排斥。研究结果表明，弹尾类群落丰富度和物种多样性对林下密度梯度的变化受非生物生态位减少和生物竞争排斥共同控制，而不受生活型特征选择的影响。
Understory vegetation plays an important role in forest ecosystems by providing protection from soil physicochemical stresses or disturbance. Consequently, this type of vegetation may help maintain soil biodiversity and functions. However, the effects of understory degradation on soil faunal communities is not well understood. This study investigated the effects of the declining understory dwarf bamboo density in cool-temperate Japanese deciduous forests on the community composition of soil Collembola; by comparing partitioned community dissimilarity indices and trait components to detect the processes shaping community under understory degradation. For the species richness and diversity of Collembola community, unimodal quadratic model to dwarf bamboo density was selected as best model among all measured environmental properties, whereas, for Collembola abundance, linear negative relationship to dwarf bamboo density was selected as best model. For Collembola trait compositions, dwarf bamboo density model was not selected, although those of soil C and hardness were selected. The nestedness component in community dissimilarity increased with greater dwarf bamboo density differences between plots, whereas the replacement component was not significant. This suggests that the decreasing dwarf bamboo density might induce reduced niche space of whole Collembola community. In the range of mid to high density of dwarf bamboo, the higher density of dwarf bamboo declined the species diversity of the Collembola community, whereas the abundance still increased, probably because of the competitive exclusion by the dominant Folsomia octoculata under less disturbed habitat condition in high understory and litter coverage. Our results implied that the changes in the abundance and species diversity of Collembola community to understory density gradient were controlled both by abiotic niche reduction and biotic competitive exclusion without life-form trait selection.