A study on growth control micophagous animals in forest soils.

笔者提出了森林土壤养分循环速率的决定因素是生物，土壤食物网结构是土壤生物活动的主导因素。为了证明这一点，我做了四项实验研究；a)松木线虫放牧对松木枯萎病的抑制作用：松木种子、松木枯萎病真菌和微食松木线虫的盆栽试验。b)完整土壤岩心处理：对完整森林地表土壤微节肢动物的土壤呼吸、淋溶水化学特性进行了比较。c) collebolan放牧对松木菌根共生的影响：在温室微观环境下，研究了collebolan放牧对松木生长和菌根的影响。d)野外微观研究：在岛根大学三部学校森林研究了千足虫对土壤微生物活性和淋滤水化学的影响。collebolan对土壤微生物的放牧抑制了松材萎蔫病的发生，增加了腐养微生物的数量，也促进了带菌根的松材幼苗的生长。千足虫对森林土壤中的阳离子循环有巨大的影响。

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.