落叶松人工林林地土壤微生物边缘效应研究  

Study on soil microbial edge effect in Larix gmelini Rupr plantation

作　　者：徐辉[1] 屈惠蕾 孟春[1] 

机构地区：[1]东北林业大学工程技术学院,哈尔滨150040

出　　处：《森林工程》2017年第2期50-55,共6页Forest Engineering

摘　　要：采用稀释倒平板法和氯仿熏蒸法,以东北林业大学哈尔滨实验林场落叶松林人工地0~80 cm土层范围为研究对象,研究落叶松人工林土壤微生物边缘效应特征及边缘效应的主要影响因子,结果表明:(1)土壤微生物数量及生物量碳均随土壤深度加深呈指数减少,80%左右的微生物数量和生物量碳存在于地表至地表下40 cm的土层中。土壤微生物存在边缘效应。生态交错带下限可以采用积分的方式求得。(2)土壤微生物数量以及生物量碳的垂直分布与土壤全C、全N、孔隙度呈显著正相关。在全C、全N不成为限制因素时,土壤孔隙度是影响土壤微生物边缘效应的关键因素。The 0 ~ 80 cm soil layer of Larix gmelini Rupr plantation in Harbin experimental forest stand of northeast forestry uni-versity was taken as research object, the main influence factors of microbial characteristics and edge effect of Larix gmelinii soil was studied by dilution plate and chloroform fumigation methods. The results showed that the microbial quantity of soil and microbial bio-mass carbon exponentially decreased with the increase of soil depth, and about 80% of them were in 40 cm - depth soil layer under the he earths surface. Soil microbe had edge effect. The lower limit of ecological ecotone could be determined by the method of integral. Vertical distribution of soil microbial quantity and microbial biomass carbon positively related to soil total carbon, total nitrogen, and soil porosity. Soil porosity is the key factor that affects soil microbial edge effect when carbon and nitrogen dont become the limiting factors.

关 键 词：落叶松人工林 土壤微生物 边缘效应 

分 类 号：S714[农业科学—林学]