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Effect of the understory shrub Pieris japonica on litter decomposition

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Abstract 本研究は,ニホンジカの採食により,下層植生が主にアセビのみとなった九州大学宮崎演習林内の針広混交林において,アセビの有無がリター初期分解に与える影響を明らかにすることを目的とした。下層植生がアセビのみのサイト(PI)と下層植生が無いサイト(NU)で,2種類のメッシュサイズ(1mm :土壌動物侵入可,42μm:土壌動物侵入不可)のリターバッグ,形質の異なる3樹種(ミズナラ、ミズメ、ブナ)の葉を用い,...4ヵ月間のリター分解実験を行った。同時に土壌環境や土壌動物の個体数についても調査を行った。リター分解速度は,サイト,樹種によって有意に異なり,PIサイトの分解速度が有意に高い結果となった。PI サイトにおける土壌含水率はNU サイトよりも有意に低かった。土壌C/N 比や土壌動物の個体数については有意差が得られなかった。本研究の結果は,試験期間中の高い降水量(2405mm)による過湿状態の土壌環境下において,アセビが存在することで土壌水分が低下し,リター分解速度が高くなったと考えられた。今後は,長期間のリター分解においても同様の効果が得られるのかを検証する必要があると考えられる。
Pieris japonica has recently been a dominant understory species in Shiiba Research Forest of Kyushu University because dwarf bamboo, which used to be distributed in forest fl¬oor in this area, has been fed by Sika deer and mostly disappeared in this forest. This research aimed to examine effect of P. japonica on initial litter decomposition. To this aim, we conducted four months litter-bag experiments for leaf litter three tree species (Quercus crispula, Betula grossa, Fagus crenata) using two mesh size (1 mm with access of soil fauna and 42 μm with no access of soil fauna) under P. japonica (PI site) and no understory site (NU site) in a cool-temperate mixed forest of Shiiba Research Forest. Soil environmental factors and density of soil mesofauna were also measured for each plot. Soil water content was significantly lower in PI site than that in NU site. This might be attributed to higher interception by P. japonica in PI site. There were no significant differences in soil CN ratio and density of soil mesofauna. Litter decomposition rate was significantly different among sites and litter species; decomposition rate in PI site was higher than that in NU site. Considerable high rainfall in this study period (2405 mm) caused high water content in soil and low oxygen availability, resulting in lower decomposition rate in NU site with higher soil water content. Future studies for longer experimental period is necessary
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Created Date 2020.06.03
Modified Date 2021.03.03

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