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在测定土壤理化性质的基础上,应用Biolog-ECO技术,分析杉木1代(FCF)、连栽2代(SCF)、连栽3代(TCF)人工林和楠木人工林(PBP,对照)4种林分类型土壤微生物群落总碳源利用动力学特性、微生物多样性指数及多样性指数与土壤理化性质的相关关系.结果显示:4种林分类型的土壤微生物丰富度(Shannon指数)、优势度(Simpson指数)、均匀度(Mc Intosh指数)均达到了显著差异(P<0.05);PBP土壤微生物总体活性(AWCD)、Shannon指数、Simpson指数及Mc Intosh指数值均高于其他3种类型;土壤微生物生物量碳(C)含量、氮(N)含量、Shannon指数、Simpson指数与AWCD值的相关性达到了显著水平(P<0.05);其中AWCD值、土壤p H、全C、全N、土壤微生物生物量C、N的大小顺序为PBP>FCF>SCF>TCF.本研究表明,随着杉木连栽代数的增加,土壤微生物群落总体活性逐代下降.(图1表7参32)
Based on the determination of soil physical and chemical properties, Biofert-ECO technology was used to analyze the effects of the first generation of Chinese Fir (FCF), the second generation of continuous planting (SCF), the third generation (TCF) plantation and the Phoebe bournei plantation (PBP) The total carbon source utilization kinetic characteristics, microbial diversity index and diversity index of soil microbial community in different types of forest were compared with those of soil physical and chemical properties.The results showed that the Shannon index of soil microbial biomass (Simpson index) and evenness (Mc Intosh index) reached significant differences (P <0.05). The overall soil microbial activity (AWCD), Shannon index, Simpson index and Mc Intosh index of PBP were higher than the other three types (C) content, nitrogen (N) content, Shannon index, Simpson index and AWCD value of soil microbial biomass reached a significant level (P <0.05). AWCD value, soil p H, total C, N, and the order of soil microbial biomass C and N was PBP> FCF> SCF> TCF. The results showed that the overall microbial community activity decreased with the increase of continuous plantation of Cunninghamia lanceolata (Fig. )