改变碳输入对亚热带人工林土壤微生物生物量和群落组成的影响

发布时间：2018-02-24 15:13

本文关键词： 去除凋落物去除根系土壤微生物生物量微生物群落组成树种亚热带人工林　出处：《生态学报》2016年12期 　论文类型：期刊论文

【摘要】：通过在亚热带杉木(Cunninghamia lanceolata)和米老排(Mytilaria laosensis)人工林中设置互换凋落物、去除凋落物、去除凋落物+去除根系和对照处理来分析改变地上、地下碳输入对人工林土壤微生物生物量和群落组成的影响。结果显示,改变地上、地下碳输入对土壤微生物生物量碳、氮的影响因树种而异。在米老排林中,土壤微生物生物量不受碳源的限制。而在杉木林中,加入米老排凋落物、去除凋落物和去除凋落物+去除根系3种处理中土壤微生物生物量碳、氮具有明显增加的趋势。磷脂脂肪酸分析结果显示,杉木林中,添加高质量的米老排凋落物后,革兰氏阳性细菌、阴性细菌、丛枝菌根真菌、放线菌和真菌群落生物量分别显著增加了24%、24%、53%、25%、28%,革兰氏阴性细菌和丛枝菌根真菌的相对丰度均有显著增加。与对照相比,杉木林中去除凋落物后革兰氏阳性细菌、阴性细菌、丛枝菌根真菌、放线菌和真菌群落生物量分别显著增加了22%、29%、44%、25%、52%,真菌与细菌比值显著增加了21%。但是,去除凋落物+去除根系处理对两个树种人工林土壤微生物群落组成均无显著影响。米老排和杉木林土壤微生物生物量碳、氮的季节变化格局不同,土壤养分有效性可能是驱动土壤微生物生物量季节变化的主要因子。未来研究需要关注凋落物和根系在不同树种人工林中对土壤微生物群落的相对贡献。
[Abstract]:Interchangeable litter was set up in Cunninghamia lanceolata and Mytilaria laosensis (Cunninghamia lanceolata) plantation to remove litter, remove litter, remove root system and control treatment. Effects of underground carbon input on soil microbial biomass and community composition in artificial forest. The results showed that the effects of underground carbon input on soil microbial biomass carbon and nitrogen were different from tree species to tree species. Soil microbial biomass was not limited by carbon source, but in Chinese fir forest, soil microbial biomass carbon was removed by adding rice litter, removing litter and removing root system. The results of phospholipid fatty acid analysis showed that after adding high quality litter, Gram-positive bacteria, negative bacteria, arbuscular mycorrhizal fungi were found in Chinese fir forest. The biomass of actinomycetes and fungi communities increased significantly, respectively. The relative abundance of Gram-negative bacteria and arbuscular mycorrhizal fungi increased significantly. The biomass of arbuscular mycorrhizal fungi, actinomycetes and fungal communities increased significantly, respectively. The biomass of arbuscular mycorrhizal fungi, actinomycetes and fungal communities increased significantly by 22% 29% and 44%, respectively, and the ratio of fungi to bacteria increased significantly by 21%. Removal of litter and root system had no significant effect on soil microbial community composition of two tree species plantations. The soil microbial biomass carbon and nitrogen patterns were different in rice row and Chinese fir forest. Soil nutrient availability may be the main factor driving the seasonal variation of soil microbial biomass. Future studies need to focus on the relative contribution of litter and root system to soil microbial communities in different tree species plantations.
【作者单位】：福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地;福建农林大学林学院;
【基金】：国家自然科学基金项目(41371269) 教育部新世纪优秀人才支持计划(DB-168) 福建省杰出青年科学基金项目(2060203)
【分类号】：R714.3

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