Strategies of belowground resource acquisition among woody species with different site preferences: fine root morphology and below-ground allocation.

根据细根形态对不同土壤条件的响应结果，特别是林分老化效应和土壤生物群落效应，提出了树种获取土壤资源的策略。柳杉老林分的分枝率、顶根死亡率和菌根侵染率均有所增加。结果表明，在抑制微节肢动物的作用下，腐生真菌孢子增多，菌根侵染率降低，细根生物量增加，SRL降低。本研究证明了用细根形态可塑性方法评价树种对土壤条件的响应。

We hypothesized some strategies of tree species to acquire soil resources according to results of responses of fine root morphology to various soil conditions, especially in stand ageing effects and in effects of soil organisms communities. In old stand of Cryptomeria japonica, branching ratio, mortality of apical roots, and mycorrhizal infection increased. In a Chamaecyparis obtusa stand, under depressing mycophagous microarthropods, spores of saprotrophic fungi increased and mycorrhizal infection rate decreased, moreover, fine root biomass increased and SRL decreased. My studies proved evaluation of the responses of tree species for soil conditions with the methods of plasticity of fine root morphology.