Surface soil (0-20 cm) samples were collected in 2006 from five moso bamboo (Phyllostachys edulis) plantations which were respectively planted in 2002, 1996, 1990, 1980 and 1960 and extensively managed. Dynamics of the soil microbial biomass and diversity with cultivation time of the bamboo plantations were investigated by means of phospholipid fatty acids (PLFAs) analysis. A site of Pinus massoniana ( PM ) forest nearby with the similar ecological background was selected as a reference. It was found that the average microbial biomass and diversity were lower ( P < 0. 05 ) in the soil of the bamboo forest planted in 2002 than in that in the natural PM forest, that is, both species numbers and populations of the soil microbes declined in a short term after PM being transformed into bamboo forest. Afterwards, a gradual recovery tendency of microbial biomass and species was observed with increasing cultivation time of the bamboo plantations, and soil average microbial biomass and diversity in 25- and 45-years-old bamboo plantations (respectively planted in 1980 and 1960) were similar with (P < 0. 05) that in natural PM forest. Statistical analysis of PLFAs data showed that the composition of soil microbial communities in PM forest was obviously different from those in bamboo plantations, and the dissimilarity increased with time of bamboo cultivation. It was concluded that in comparison with PM , long-term extensive management of bamboo plantations did not bring about significant change in soil microbial biomass and diversity, but microbial communities varied with the increasing time of bamboo plantation, indicting bamboo plantation ecosystem under extensive management could develop rich biodiversity and be sustainably developed.%全球的竹业已发展成为一个与约25亿人的生产生活密切相关、年产值近50亿美元的产业.竹林是我国南方山区经济价值高、经营面积广、经营强度大的森林类型之一,我国现有竹林520万hm2,其中毛竹(Phyllostachys edulis)超过350万hm2(第六次森林资源清查).毛竹生长快、竹材利用前景好、经济效益高,深受山区农民欢迎,近年来许多天然林及杉木(Cunninghamia lanceolata)等速生林被毛竹替代,毛竹林面积不断扩大.目前,竹林生物多样性丧失、生产力下降和生态服务功能降低等现象逐渐显现,引起了相关组织和专家的重视(杨淑贞等,2008).
展开▼
