生态学报2023，Vol.43Issue(23)：9805-9813,9.DOI:10.20103/j.stxb.202210192964
亚热带森林根系和菌根真菌调控凋落叶分解和主场效应
Roots and associated mycorrhizal fungi regulate leaf litter decomposition and home-field advantage in subtropical forests
摘要
Abstract
Plant litter decomposition is a basic process involved in terrestrial ecosystem carbon and nutrient cycling.Root dispersal into the litter layer is a common phenomenon in forest ecosystems.Existing studies on litter decomposition have primarily focused on the impact of climatic conditions,environmental factors,and litter quality on decomposition.However,investigations into the regulation of litter decomposition by roots and mycorrhizal fungi,as well as the home field effects(HFA),remain insufficient.We conducted a litter decomposition experiment with two treatments-reciprocal litter transplantation and root exclusion-in Phoebe zhennan(an arbuscular mycorrhizal tree species)and Castanopsis kawakamii(an ectomycorrhizal tree species)plantations in subtropical China.Over a period of 720 days,we found that the presence of roots increased the rate of litter decomposition in P.zhennan plantation.However,in the C.kawakamii plantation,the presence of roots had no significant effect on the rate of litter decomposition for C.kawakamii.Moreover,regardless of the presence or absence of roots and associated mycorrhizae,no HFA effect was observed for P.zhennan litter.Conversely,C.kawakamii litter exhibited a negative HFA effect solely in the presence of roots and mycorrhizae.This negative HFA effect for C.kawakamii litter may attribute to the higher saprophytic fungal abundance and phosphorus-degrading enzymes activity in the guest environment than in the home environment.Our findings suggest that the interaction between mycorrhizal and saprotrophic fungi may be a key factor in determining litter decomposition rates and the HFA effect through modification of saprophytic fungal abundance and P-acquiring enzyme activities in P.zhennan and C.kawakamii plantations.关键词
凋落物分解/植物-微生物互作/胞外酶活性/"Gadgil"效应/腐生真菌Key words
litter decay/plant-microbe interactions/extracellular enzymes/Gadgil effect/saprophytic fungi引用本文复制引用
王振宇,万晓华,黄志群..亚热带森林根系和菌根真菌调控凋落叶分解和主场效应[J].生态学报,2023,43(23):9805-9813,9.基金项目
国家自然科学基金项目(31930077,31600495) （31930077,31600495）
