A study on growth control micophagous animals in forest soils.

笔者认为，生物是森林土壤养分循环速率的决定因素，土壤食物网结构决定着土壤中的生物活动。为了证明这一点，我做了四个实验研究：a）通过弹尾虫放牧抑制松树枯萎病：用松树种子、枯萎病真菌和食微弹尾虫进行盆栽实验。B）完整土芯操作：在完整森林地面上比较有和没有土壤微型节肢动物的土壤呼吸、淋溶水化学。（3）弹尾虫放牧对松树-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的影响。（d）实地微观研究：以岛根大学山部森林为研究对象，研究了千足虫对土壤微生物活性和淋溶水化学的影响。弹尾虫放牧对土壤微生物的影响抑制了松树枯萎病的发生，增强了土壤中腐解微生物的数量，同时也促进了有菌根的松树幼苗的生长。千足虫对森林土壤阳离子循环有很大的影响。

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.