CAJ | 학술논문

我国喀斯特区域面积分布较广,而喀斯特生态系统的退化已成为当前西南地区面临的严重的生态问题.本研究选取贵州中部两种不同植被类型的生态系统-乔木林和灌木林.以乔木林中的白栎、园果化香和灌木林中的火棘、竹叶椒等主要优势树种为对象,研究不同的植物树种对根际土壤微生物生物量及其细菌群落结构的影响.结果显示:乔木林系统中根际土壤微生物生物量碳、氮显著性高于灌木林,植物的根际效应在乔木林中表现更为显著;同时乔木林中的优势树种通过根系分泌物的作用显著提高根际土壤细菌多样性指数,而灌木林中优势树种的根际土壤微生物量及多样性均未表现出明显的根际效应.因此,植被的演替通过改变土壤微生物的特性影响植物-微生物-土壤之间的物质和能量循环,进一步影响喀斯特生态系统的稳定和健康功能.
아국객사특구역면적분포교엄,이객사특생태계통적퇴화이성위당전서남지구면림적엄중적생태문제.본연구선취귀주중부량충불동식피류형적생태계통-교목림화관목림.이교목림중적백력、완과화향화관목림중적화극、죽협초등주요우세수충위대상,연구불동적식물수충대근제토양미생물생물량급기세균군락결구적영향.결과현시:교목림계통중근제토양미생물생물량탄、담현저성고우관목림,식물적근제효응재교목림중표현경위현저;동시교목림중적우세수충통과근계분비물적작용현저제고근제토양세균다양성지수,이관목림중우세수충적근제토양미생물량급다양성균미표현출명현적근제효응.인차,식피적연체통과개변토양미생물적특성영향식물-미생물-토양지간적물질화능량순배,진일보영향객사특생태계통적은정화건강공능.
The degradation ofkarst ecosystem in Southwest China has been a serious ecological problem. To research the effects of different vegetation types on microbial biomass and bacterial community structures of rhizosphere soil, we selected the dominant tree species, Quercusfabri,Platycarya longipes in forest and Pyracantha fortuneana, Zanthoxylum planispinum in shrubbery, in two typical karst ecosystems. The results showed that microbial biomass carbon and nitrogen of rhizosphere soil in forest were higher than those in shrubbery, and the effects of the dominant tree species of Quercus fabri and Plao,carya longipes in forest was more obvious compared to shrubbery. Bacterial diversity indexes of rhizosphere soil of dominant tree species in forest were significantly higher than those of bulk soil by the root exudates, but in shrubbery, there was no significant difference in both microbial biomass and diversity indexes between rhizosphere soil and bulk soil. It suggests that the vegetation succession could affect the cycle of substance and energy among plant-microbe-soil system by changing the characters of soil microbe, even affect the stabilization and health ofkarst ecosystems.