关键词: 物种多样性, 竞争, 群落结构, 南方红豆杉, 更新

Abstract: To clarify the changes of main structural indexes of community during the expansion of moso bamboo forests (Phyllostachys edulis), the interfaces of bamboobroadleaved forest, bambooChinese fir forest and bambooabandoned land were selected by setting transects. The results indicated that with the expansion of bamboo forests to broadleaved forests, diameter at breast height (DBH), biomass, leaf area index (LAI), litterfall amount, carbon (C), nitrogen (N) and phosphorus (P) contents, C∶P and N∶P showed a decreasing trend. With the expansion of bamboo forests to Chinese fir forests, the DBH and biomass of forefront bamboos were low while they were high for bamboo in the middle of interface. LAI, litterfall amount and C and N contents decreased with the increasing indensity of bamboo to Chinese fir, while litterfall P content, litterfall C∶P and N∶P increased with the increasing proportion of bamboo to Chinese fir. With the expansion of bamboo forests to abandoned land, DBH, biomass, LAI, litterfall biomass, C∶P and N∶P increased with the increasing proportion of bamboo while the contents of C, N and P declined. Overall, with the expansion of bamboo forests to broadleaved forests, Chinese fir forests and abandoned land, DBH, LAI and the quantity and quality of litterfall were changed adaptively. Specifically, when bamboo expanded to broadleaved forests, the growth of bamboo was promoted by increasing the DBH, LAI and litterfall quantity in forefront interface, as well as higher contents of C, N and P. With the expansion of bamboo forests to Chinese fir forests, the limitation of P for bamboo growth was reduced by increasing the LAI, DBH and litterfall C∶P and N∶P. With the expansion to abandoned land, the body size and LAI of bamboo were reduced to accommodate a relatively extreme environmental condition; Litterfall amount, P content and N∶P increased with the increase of DBH.

Key words: competition., Taxus chinensis var. mairei, species diversity, regeneration, community structure