Difference in effect of understory on soil Collembola community between stands with different slope steepness and vegetation

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  • Hishi Takuo
    Division of Forest Environmental Science, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University
  • Kawakami Erika
    Educational course of Forest Environmental Science, Department of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Katayama Ayumi
    Division of Forest Environmental Science, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University

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Other Title
  • 林相と斜度の異なる林分間では下層植生が土壌のトビムシ群集に与える影響が異なる
  • リンソウ ト シャド ノ コトナル ハヤシ ブン カン デワ カソウショクセイ ガ ドジョウ ノ トビムシ グンシュウ ニ アタエル エイキョウ ガ コトナル

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Description

In Shiiba Research Forest, we clarified the effect of the presence or absence of understory vegetation on the soil collembolan community at two sites with different situations. Study site A is a mixed forest with steep slopes, and study site B is a secondary forest of Japanese red pine on a gentle slope. The understory vegetation of the site A is Sasa borealis (dwarf bomboo), and that of the site B is Pieris japonica (Japanese andromeda). In each site of A and B, dense understory plots and no understory plots were established. Then, the abundance, species richness, species diversity, trait mean value, and functional diversity of the Collembola community composition. We used a edaphic adaptation score that scored adaptability to deeper soil related to lifeform of Collembola species. Abundance and species richness of Collembola community were significantly reduced in no understory plots in the site A and not significantly changed in the site B. The species diversity, trait mean and functional diversity did not change significantly with or without understory vegetation. The species composition did not change at the Site B, but did change at the site A. From the correlation analysis, the decrease in abundance of the site A was due to decline of understory vegetation. In addition, changes in the abundance of Collembola between with and without understory was observed only in the site A, suggesting that the diversity-preserving function of soil Collembola in the understory may be exerted on steep slopes with dwarf bamboo but not on gentle slopes with andromeda.

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