A study on growth control micophagous animals in forest soils.

我假设生物是森林土壤养分循环速率的决定因素，土壤食物网结构负责土壤中的生物活动。为了证明这一点，我进行了四项实验研究：a)通过弹尾虫放牧抑制松材线虫病：用松树种子、枯萎病真菌和食性弹尾虫进行盆栽实验。B)完整土壤核心处理：比较了有无土壤微节肢动物在完整林地土壤呼吸、淋溶水化学方面的差异。C)弹尾虫放牧对松菌根共生的影响：在温室微宇宙中研究了弹尾虫放牧对松树生长和菌根生长的影响。D)田间微观世界研究：在岛根大学Sanbe学校森林中，研究了千足虫对土壤微生物活性和淋洗水化学的影响。弹尾虫对土壤微生物的放牧抑制了松材线虫病的发生，促进了腐生微生物的生长，也促进了有菌根的松苗生长。千足虫对森林土壤阳离子循环有很大影响。

I hypothesized that organisms are the determinant of nutrient cycling rate in forest soils and soil food-web structure is responsible for biological activities in soils. To proof this, I made four experimental studies ; a) Suppression of pine wilt disease by collembolan grazing : a pot experiment with pine seedlng, wilt disease fungus and micophagous Collembola. b) Intact soil core manipulation : comparison of with and without soil microarthropods in intact forest floor were compared in terms of soil respiration, leaching water chemistry. c) Collembolan grazing effect on pine-mycorrhizal symbiosis : effects of collembolan grazing on pine growth and mycorrhiza were investigated in greenhouse microcosm. d) Field microcosm study : Millipede effect on soil microbial activity and leaching water chemistry was investigated in Sanbe School Forest of Shimane University. Collembolan grazing on soil microorganisms suppressed the occurrence of pine wilt disease, enhanced the saprotrophic microorganisms, and also enhanced the growth pine seedlings with mycorrhiza. Millipede had enormous effect on cation cycling in the forest soil.