滇西北高原湿地植物凋落物在不同分解界面的质量衰减及其微生物驱动
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引用本文:闫鹏飞,展鹏飞,王 行,刘振亚,张晓宁,张 贇,肖德荣.滇西北高原湿地植物凋落物在不同分解界面的质量衰减及其微生物驱动[J].西北植物学报,2019,39(4):712~721
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闫鹏飞,展鹏飞,王 行,刘振亚,张晓宁,张 贇,肖德荣* (西南林业大学湿地学院/国家高原湿地研究中心昆明 650224) 
基金项目:国家自然科学基金(31370497,31500409,41877346);
中文摘要:研究植物凋落物分解及其微生物的驱动机制,对于掌握湿地生态系统物质循环特征及其关键生态过程具有重要意义。该研究以滇西北高原典型湿地纳帕海湖滨带的优势植物茭草和杉叶藻为研究对象,通过凋落物袋法和Biolog GenⅢ技术,研究其凋落物在大气界面、水界面和土界面的质量衰减特征以及微生物的碳源利用和代谢的变化规律。结果表明:(1)通过一年的分解,茭草凋落物在大气界面、水界面和土界面的质量残留率分别为77.7%、42.2%、25.3%,显著高于杉叶藻凋落物的相应质量残留率(41.6%、32.5%、12.4%);但同一物种不同分解生境下质量残留率则表现为大气界面>水界面>土界面。(2)2种植物不同界面的平均吸光度值上升快慢存在差异,茭草土界面和杉叶藻大气界面中的微生物碳源代谢强度最大;土界面下茭草植物微生物碳源利用率最高,且醇类和胺类的碳源利用率达到0.26和0.24。(3)2种植物的微生物群落结构存在一定的差异,茭草凋落物土界面中微生物群落对各类碳源有较强的利用能力,其微生物群落所含物种比较丰富、群落均匀性和多样性更加明显,与茭草凋落物质量残留率季节性变化结果较为一致。研究认为,研究区域内凋落物质量衰减和微生物的关系,可以为生态系统的稳定与发展及凋落物分解的微生物学机理提供科学依据。
中文关键词:滇西北高原  凋落物分解  微生物  碳源利用
 
Mass Attenuation of Plant Litter and Its Microbial Driving from a Wetland of Northwestern Yunnan Plateau, China
Abstract:Studying the effects of microorganisms on the decomposition of litter and its action law are great significance for revealing the changes of ecosystem material cycle and ecological function. In this study, the dominant lakeside plants Zizania latifolia and Hippuris vulgaris were used as the research objects from the Napahai wetland, which is located on the Northwestern Yunnan Plateau. The mass attenuation characteristics and changes in microbial carbon source utilization and metabolism of litter under different interfaces were studied by Biolog GenⅢ identification technology. The results revealed that: (1) after one year decomposition, the mass residue rates of Z. latifolia at air interface, water interface and soil interface were 77.7%, 42.2% and 25.3%, respectively, which were significantly higher than those of H. vulgaris (41.6%, 32.5%, 12.4%). For the same species, the mass residue rates at different decomposition habitats were air interface > water interface > soil interface. (2) There is a difference in the AWCD values of the two plants at different interfaces. The microbial carbon source has the highest metabolic intensity at the soil interface for Z. latifolia and the air interface for H. vulgaris. Microbial carbon source utilization of Z. latifolia was the highest under soil interface, and carbon source utilization of alcohols and amines reached 0.26 and 0.24, respectively. (3) There are certain differences in the microbial community structure between two plant litters. The microbial community at the soil interface of Z. latifolia litter has a strong ability to utilize all kinds of carbon sources, and its microbial community contains abundant species, and its community uniformity and diversity are more obvious, which is consistent with the seasonal variation of Z. latifolia mass residue rate. To study the relationship between the decomposition of litter and microorganisms can provide scientific basis and reference for the stability and development of ecosystem and the microbiological mechanism of litter decomposition.
keywords:Northwestern Yunnan Plateau  litter decomposition  microorganisms  carbon sources utilization
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