落叶松人工林土壤养分与微生物群落的变化动态  

Dynamics of Soil Nutrient and Microbial Community of Larch Plantation

作　　者：邵元元[1] 邹莉[1] 王志英[1] 吴韶平[1] 

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2011年第1期82-84,98,共4页Journal of Northeast Forestry University

基　　金：国家重点基础研究发展计划资助(2009CB125906)

摘　　要：利用稀释平板法和Biolog检测技术，分析了落叶松人工林土壤微生物群落的时间动态，并测定了土壤养分的月份变化动态。结果表明：在土壤微生物群落中，细菌数量占绝对优势，放线菌次之，真菌最少。5-10月，表层与上层（0-10cm）细菌数量为先增后减，下层（10-20cm）为持续减少；表层真菌数量呈增加趋势，其余土层真菌的数量变化无明显规律；表层放线菌数量呈递减趋势，其余土层放线菌的数量变化无明显规律。相关分析结果表明：速效钾的质量分数与细菌数量呈负相关，速效钾和有效磷的质量分数与放线菌数量存在显著正相关性。BiologEco微平板的碳源平均颜色变化率随月份变化而不同，8月份最高。5-10月，表层与上层（0—10cm）土壤微生物群落的多样性指数、丰富度指数、均匀度指数以及下层（10—20cm）土壤的多样性指数、丰富度指数均呈先增后减的趋势，下层（10～20cm）的均匀度指数呈先减后增的变化趋势。An experiment was conducted to study the soil microbial community dynamics of larch plantation by the dilution plate method using Biolog detection techniques. Monthly changes of soil nutrients were determined. Result demonstrated that, among the three groups of soil microbes, bacterial population was dominant, followed by actinomycetes and fungi in order. The bacterial population in the surface and upper soils （0-10 cm） first increased and then decreased from May to October, while it gradually decreased in 10-20 cm depth soil. The fungal population in the surface soil showed an increasing tendency in May and October, while it changed irregularly in other soil layers. The actinomycete population in the surface soil exhibited a decreasing tendency during May and October, while it changed irregularly in other soil layers. Available potassium had a negative correlation with bacterial population, while available potassium and effective phosphonls had a significantly positive correlation with actinomycete population. Average well-color development of carbon source calculated by Biolog Eco Plate was various in different months, and it was highest in August. The diversity index, richness index and evenness index of the microbial communities in the surface and upper soils （0-10 cm） as well as the diversity index and richness index in the 10-20 cm depth soil all first increased and then decreased, but the evenness index of the microbial communities in the 10-20 cm depth soil first decreased and then increased.

关 键 词：落叶松人工林 土壤养分 微生物群落 动态 Biolog检测法 

分 类 号：S154.38[农业科学—土壤学] S791.22[农业科学—农业基础科学]