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采用Biolog方法,以10 a、21 a、30 a、40 a和52 a生落叶松人工林土壤为对象,研究了典型黑土区落叶松人工林表层土壤微生物群落对Biolog-ECO板不同类型碳源的利用情况。结果表明:落叶松人工林表层土壤微生物群落利用单一碳源的能力(AWCD)随着林龄增加呈上升趋势,AWCD的变化范围为0.30~1.59(168 h);落叶松人工林表层土壤微生物群落对6类碳源的利用率均随林龄的增加而增大,且5种林地土壤微生物群落比较偏好、利用率较高的碳源是碳水类、氨基酸类和多聚物类,这3类碳源利用率的变化范围分别为0.35~1.91、0.49~1.74和0.25~1.76;主成分分析进一步论证了落叶松人工林土壤微生物对碳源的利用能力随林龄增大而逐渐增强。
The Biolog method was used to study the effects of topsoil microbial communities on the biomass of the Biolog-ECO plate in 10 a, 21 a, 30 a, 40 a and 52 a larch plantations. Use of the situation. The results showed that the AWCD of upper soil larch plantations increased with the increase of stand ages, and the AWCD ranged from 0.30 to 1.59 (168 h). The surface soil microbial community of Larix gmelinii plantation The utilization rate of six types of carbon sources increased with the increase of age, and the soil microbial communities in five kinds of forest land preferred, and the carbon sources with high utilization rate were carbohydrates, amino acids and polymers, and these three categories The carbon source utilization ranged from 0.35 to 1.91, from 0.49 to 1.74 and from 0.25 to 1.76, respectively. The principal component analysis further demonstrated that the ability of soil microorganisms to utilize carbon sources in the larch plantation increased gradually with age.