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为了探讨造林模式对土壤理化性质和微生物群落功能多样性的影响,以辽宁省新宾陡岭水曲柳(Fraxinus mandshurica)、长白落叶松(Larix olgensis)人工纯林及二者混交林土壤为研究对象,对不同林型土壤pH值、养分含量和土壤微生物活性进行研究,对3种人工林土壤微生物代谢功能多样性进行分析。结果表明:混交林土壤全氮、速效氮、全磷和速效磷分别比落叶松纯林增加28.1%、35.6%、9.5%和12.9%;不同人工林土壤微生物群落代谢活性差异显著,总碳源的利用能力(AWCD)的顺序为水曲柳林>混交林>落叶松林,落叶松纯林土壤微生物代谢最慢,活性最弱;3种不同人工林土壤微生物群落对六大碳源的利用率存在差异,混交林在L-精氨酸、L-天门冬酰胺、丙酮酸甲酯、腐胺、N-乙酰-D-葡萄糖胺、D-半乳糖醛酸、D-葡萄糖胺酸和4-羟基苯甲酸等8种碳源的利用能力显著高于落叶松纯林;主成分分析显示,糖类和氨基酸类碳源是影响微生物活性的重要碳源;3种不同人工林土壤微生物优势度指数无显著差异,物种丰富度指数依次为水曲柳林>混交林>落叶松林;落叶松和水曲柳带状混交后可以提高土壤肥力及土壤微生物活性。
In order to investigate the effect of afforestation mode on soil physical and chemical properties and functional diversity of microbial community, Fraxinus mandshurica, Larix olgensis artificial pure forest and mixed forest soil of Liaoning Province were studied Object, the soil pH value, nutrient content and soil microbial activity of different forest types were studied, and the metabolic function diversity of soil microorganisms in three kinds of plantations was analyzed. The results showed that total N, available N, total P and available P in soil increased by 28.1%, 35.6%, 9.5% and 12.9%, respectively. The metabolic activities of soil microbial community in different plantations varied significantly. (AWCD) were the order of A. mongolicus> mixed forest> the pure and slow metabolism of soil microorganisms in the pure forests of larch and larch; the utilization rate of six carbon sources in the soil microbial communities of three different plantations There were differences in the mixed forest in L-arginine, L-asparagine, methyl pyruvate, putrescine, N- acetyl-D-glucosamine, D-galacturonic acid, D- Hydroxybenzoic acid and other eight carbon sources were significantly higher than the pure larch forest; principal component analysis showed that carbohydrate and amino acid carbon source is an important carbon source affecting microbial activity; three kinds of artificial forest soil microbial dominance index There was no significant difference between them. Species richness index followed by the order of Fraxinus mandshurica> mixed forest> larch forest; mixed with Larch and Fraxinus mandshurica could increase soil fertility and soil microbial activity.