红壤侵蚀裸地不同植被恢复后林地土壤微生物特性的研究

本研究以中国科学院红壤生态实验站侵蚀地植被恢复试验区为依托,调查侵蚀裸地不同植被恢复类型林地表层土壤微生物特性.结果表明:侵蚀裸地种植植被后,表层土壤酸化程度减小,土壤养分含量和孔隙度显著提高,微生物生物量增加、活性增强;不同植被恢复类型相比,各指标的大小顺序均为樟树>胡枝子>马尾松;侵蚀裸地植被恢复前后表层土壤均以细菌为主,其中马尾松林地表层土壤真菌比例最高:植被恢复林地土壤有机C处于累积阶段,土壤微生物对C的利用率显著提高,但不同植被恢复类型之间无显著差异.

Soil microbial characteristics under different vegetations restoration on a severely eroded red soi

This study reports the effects of different vegetation restoration on soil microbial characteristics, based on a long-term experiment established in 1987 at the Ecological Experimental Station of Red Soil, Chinese Academy of Sciences. This experiment included different types of vegetation planted on eroded bare land. The results showed that soil pH, soil nutrients, soil total porosity, soil microbial biomass and soil respiration rate increased significantly under different vegetations restoration compared with the eroded bare land. The concentrations of indices measured under Cinnamomum camphora were higher than that under Lespedeza bicolor, Pinus massoniana forest had the lowest the concentrations of indices measured. Soil microbial community was mainly composed of bacteria in all treatments. The ratio of ergosterol-C to microbial biomass carbon was the highest under Pinus massoniana among all treatments. Soil organic matter accumulated with vegetation restoration land. At the same time, the availability of carbon for soil microbe increased significantly, but not significantly different among vegetation types.