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张晓宁,刘振亚,李丽萍,王 行,张 贇,孙 梅,肖德荣.增温对滇西北高原典型湿地湖滨带优势植物凋落物质量衰减的影响.生态学报,2017,(23).http://dx.doi.org/10.5846/stxb201610021988  
增温对滇西北高原典型湿地湖滨带优势植物凋落物质量衰减的影响
Responses of litter decomposition of dominant lakeside plants to experimental warming in typical Northwestern Yunnan Plateau wetland, China
投稿时间:2016-10-02  修订日期:2017-06-28
DOI: 10.5846/stxb201610021988
关键词大气增温  湖滨带植物  凋落物分解  滇西北高原
Key WordsAir warming  Dominant lakeside plants  Litter decomposition  Northwestern Yunnan Plateau
基金项目国家自然科学基金(31370497, 31500409);云南省高原湿地创新团队(2012HC007)
作者单位E-mail
张晓宁 西南林业大学国家高原湿地研究中心 731697160@qq.com 
刘振亚 西南林业大学国家高原湿地研究中心  
李丽萍 西南林业大学国家高原湿地研究中心  
王 行 西南林业大学国家高原湿地研究中心  
张 贇 西南林业大学国家高原湿地研究中心  
孙 梅 西南林业大学国家高原湿地研究中心  
肖德荣 西南林业大学国家高原湿地研究中心 xiaoderong1@163.com 
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摘要:
气候变暖对湿地生态系统碳循环的影响受到国内外的广泛关注。研究大气增温对植物凋落物分解的影响是掌握气候变暖对湿地生态系统碳循环影响过程及其作用机制的基础。本研究通过开顶式生长室(Open-top Chambers,OTCs)模拟大气增温(2.0 ± 0.5)℃和(3.5 ± 0.5)℃,以滇西北高原典型湿地纳帕海湖滨带的优势植物茭草(Zizania caduciflora)、水葱(Scirpus tabernaemontani)、黑三棱(Sparganium stoloniferum)和杉叶藻(Hippuris vulgaris)为研究对象,研究其凋落物在大气界面,水界面,土-水界面的质量衰减对大气增温的响应。结果表明,(1)大气增温促进了4种植物凋落物在不同分解界面的质量衰减,但其质量衰减率在不同分解界面对增温的响应存在差异。其中,增温对水界面植物凋落物质量衰减的促进作用最大,并随着增温的幅度的增加而增加。其次是土-水界面,增温对大气界面植物凋落物质量衰减的促进作用最小。(2)植物凋落物初始C/N值与其凋落物质量衰减率呈负相关,大气增温对低初始C/N物种凋落物质量衰减率的促进更为显著。(3)相对于大气增温,植物凋落物初始C/N值对其凋落物质量衰减的影响高于大气增温对其质量衰减率的影响。本研究表明,气候变暖将促进湿地植物凋落物的分解,进而对湿地生态系统物质循环及其生态功能产生影响,其影响程度与湿地植物物种有关,其作用机制有待于进一步深入研究。
Abstract:
The impacts of climate change on the carbon cycle of wetland ecosystems have received considerable concerns worldwide. The knowledge on the response of litter decomposition of wetland plants to global warming is essential to anticipate climate change effects on carbon source/sink function in wetlands, yet is still poorly understood. Through Open-Top Chambers that generate different warming conditions (2.0 ± 0.5 °C and 3.5 ± 0.5 °C), we experimentally examined the influence of atmospheric warming on plant biomass reduction at atmosphere interface, water interface and soil-water interface, using four dominant lakeside plants, Zizania caduciflora , Scirpus tabernaemontani, Sparganium stoloniferum and Hippuris vulgaris in Napahai wetland located in the Northwestern Yunnan plateau. The results showed that: (1) experimental warming promoted the mass decay of four plants at all interfaces, while differences of the decay rate existed between interfaces. The water interface yielded highest decay rate, followed by the water interface, and the slowest decay was seen at the soil-water interface. (2) The decomposition rates under all experimental warming conditions were correlated with the initial C/N ratio of plant litters. Biomass decay of plants with lower C/N ratio was relatively more sensitive to warming than those with higher values. (3) Overall, the initial C/N ratio had greater effects on the litter decomposition than warming. This study suggests that global warming may further promote plant decomposition in wetland ecosystems in Northwestern Yunnan, with considerable consequences for carbon cycle and ecological functioning of wetland ecosystems in the future. Studies should further target on the mechanisms underlying the response of litter decomposition to atmospheric warming.
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