环境因子对山西太岳山土壤微生物量的影响

发布时间：2019-04-26 02:03

【摘要】：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。
[Abstract]:Soil samples of two forest types (Larix principis-rupprechtii plantation, shrub forest) and sunny slope in Taiyue Mountain, Shanxi Province, were used to study the soil microbial biomass carbon, nitrogen and soil physical and chemical properties under different slopes, and the physical and chemical properties of soil microbial biomass carbon, nitrogen and soil physical and chemical properties were studied in this paper. Variation characteristics of soil microbial carbon-nitrogen ratio. The results showed that the contents of soil organic carbon, total nitrogen, microbial biomass carbon and nitrogen in 0 ~ 10 cm soil layer were significantly higher than those in 10 ~ 20 cm soil layer. Under Larix principis-rupprechtii plantation and shrub forest, soil microbial biomass carbon, soluble organic carbon and the sum of both were significantly higher in sunny slope than in overcast slope. The ratio of soil microbial biomass carbon to the sum of the two was about 81% ~ 87%, and there was no significant difference in different slopes. The soil microbial biomass C / N ratio was 6.5 ~ 7.2under shrub forest sunny slope, 7.3 ~ 9.9on overcast slope, 7.3 ~ 8.6 ~ 8.6under overcast slope and 8.2 ~ 8.6under overcast slope of Larix principis-rupprechtii plantation. The soil microbial entropy was higher in the sunny slope than in the overcast slope under the two forest types. The results of correlation analysis showed that soil microbial biomass carbon and nitrogen were positively correlated with soil pH value and soluble organic carbon, and soil organic carbon was positively correlated with soil total nitrogen, microbial biomass carbon, pH value and water content. Generally speaking, different slope directions have an important effect on soil microbial biomass, and the soil microbial entropy is different. The organic carbon activity of overcast slope soil is smaller and the stability of carbon pool is better. This paper discusses the effect of soil environment on soil microorganism from the point of view of soil microbial biomass and its relationship with environmental factors in order to provide a reference for better understanding of soil carbon turnover and ecological effects of vegetation restoration in this area.
【作者单位】：北京林业大学省部共建森林培育与保护教育部重点实验室;
【基金】：林业公益性行业科研专项(201404213)资助
【分类号】：S154.3

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