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本文以山西太岳山两个林型(华北落叶松人工林、灌木林)下阴坡和阳坡的土壤样品为研究对象,研究了不同坡向下土壤微生物量碳、氮、土壤理化性质、土壤微生物碳氮比值的变化特征。研究结果表明:土壤有机碳、全氮、微生物量碳、氮含量在0~10 cm土层均显著高于10~20 cm土层。在华北落叶松人工林和灌木林下,土壤微生物量碳、可溶性有机碳及两者之和在阳坡均显著高于阴坡;土壤微生物量碳占两者之和的比例约为81%~87%,在不同坡向下没有显著性差异。土壤微生物量碳氮比在灌木林阳坡下为6.5~7.2,阴坡为7.3~9.9;在华北落叶松人工林阳坡下为7.3~8.6,阴坡为8.2~8.6。两种林型下土壤微生物熵在阳坡均高于阴坡。相关性分析结果表明,土壤微生物量碳、氮与土壤pH值、可溶性有机碳呈显著正相关,土壤有机碳与土壤全氮、微生物量碳、pH值和含水率均有显著正相关性。总的来说,不同坡向对土壤微生物量产生重要影响,进而使土壤微生物熵不同,阴坡土壤有机碳活性较小,碳库的稳定性较好。本文从土壤微生物量及其与环境因子相互关系的角度探讨了土壤环境对土壤微生物的影响,以期为更好的理解该地区土壤碳周转和植被恢复生态效应提供参考。
In this paper, the soil samples of two types of forest (Larix principis-rupprechtii plantation and Shrub forest) on the Taiyue Mountain in Shanxi Province were selected to study the effects of soil microbial biomass carbon and nitrogen, soil physical and chemical properties, Change characteristics of microbial carbon and nitrogen ratio. The results showed that soil organic carbon, total nitrogen, microbial biomass carbon and nitrogen contents in 0 ~ 10 cm soil layer were significantly higher than those in 10 ~ 20 cm soil layer. Under the Larix principis-rupprechtii plantations and shrubbery, the sum of soil microbial biomass carbon, soluble organic carbon and the sum of the two was significantly higher than the shady slope in the sunny slope; the proportion of soil microbial biomass C and C accounted for about 81% 87%, there is no significant difference in different slopes. Soil microbial biomass C: N ratio was 6.5-7.2 under sunny slope and 7.3-9.9 at shady slope, 7.3-8.6 at sunny slope of Larix principis-rupprechtii and 8.2-8.6 at shady slope. Soil microbial entropy under both forest types was higher than that on the shady slope. Correlation analysis showed that there was a significant positive correlation between soil microbial biomass carbon and nitrogen and soil pH and soluble organic carbon. Soil organic carbon was positively correlated with soil total nitrogen, microbial biomass carbon, pH and water content. In general, the different aspect has an important impact on soil microbial biomass, which in turn leads to different soil microbial entropies, less organic carbon in shady soil, and better carbon pool stability. In this paper, the effects of soil environment on soil microorganisms were discussed from the perspective of soil microbial biomass and its relationship with environmental factors, in order to provide a reference for better understanding the soil carbon turnover and vegetation restoration ecological effects in this area.