Substrate and/or substrate-driven changes in the abundance of methanogenic archaea cause seasonal variation of methane production potential in species-specific freshwater wetlands
Substrate and/or substrate-driven changes in the abundance of methanogenic archaea cause seasonal variation of methane production potential in species-specific freshwater wetlands
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产甲烷古菌丰度的基质和/或基质驱动的变化导致特定物种淡水湿地甲烷生产潜力的季节性变化
DOI：
10.1007/s00253-014-5571-4
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发表时间：
2014-05-01
影响因子：
5
通讯作者：
Lin, Yongxin
中科院分区：
文献类型：
--
作者：
Liu, Deyan;Ding, Weixin;Lin, Yongxin
自然湿地的甲烷（CH4）排放量存在较大的时间和空间变化。为了了解 CH4 生产潜力 (MPP) 的时间变化，从 2011 年 6 月至 10 月期间从永久淹没的苔草沼泽和夏季淹没的狭叶茅草沼泽中采集了土壤样品。对 MPP、溶解有机碳 (DOC) 浓度、产甲烷古菌的丰度和群落结构进行了评估。在C. lasiocarpamarsh、DOC 浓度、MPP 和产甲烷菌种群表现出相似的季节变化，并在 9 月份出现最大值。 C 中的 MPP 和 DOC。狭叶沼泽表现出季节性变化，价值在八月达到峰值，而产甲烷菌数量随着植物生长而减少。仅对于 C，产甲烷菌丰度与 DOC 显着相关（P= 0.02）。拉西奥卡帕沼泽。采样期间，优势产甲烷菌为产甲烷菌科和若尔盖菌群I（ZC-I）。狭叶沼泽，以及甲烷微生物目和C中的ZC-I。拉西奥卡帕沼泽。 MPP 与 C 中的 DOC 和产甲烷菌种群显着相关（P= 0.04）。 lasiocarpamarsh，但仅在 C 中含有 DOC。狭叶沼泽。添加C. lasiocarpalitter比添加C更有效地增强MPP。 angustifolialitter，表明基质的时间变化是由 C 中的枯落物沉积控制的。 lasiocarpamarsh 而活植物物质在 C 中更重要。狭叶沼泽。本研究表明，在特定物种的淡水湿地的生长季节，产甲烷菌的优势类型没有明显的变化。 MPP 的时间变化受底物和底物驱动的产甲烷古菌丰度变化的控制。 lasiocarpamarsh，而 MPP 仅取决于来自根系分泌物或 C 中土壤有机质的底物可用性。狭叶沼泽。
There are large temporal and spatial variations of methane (CH4) emissions from natural wetlands. To understand temporal changes of CH4production potential (MPP), soil samples were collected from a permanently inundatedCarex lasiocarpamarsh and a summer inundatedCalamagrostis angustifoliamarsh over the period from June to October of 2011. MPP, dissolved organic carbon (DOC) concentration, abundance and community structure of methanogenic archaea were assessed. In theC. lasiocarpamarsh, DOC concentration, MPP and the methanogen population showed similar seasonal variations and maximal values in September. MPP and DOC in theC. angustifoliamarsh exhibited seasonal variations and values peaked during August, while the methanogen population decreased with plant growth. Methanogen abundance correlated significantly (P= 0.02) with DOC only for theC. lasiocarpamarsh. During the sampling period, the dominant methanogens were theMethanosaetaceaeand Zoige cluster I (ZC-Ι) in theC. angustifoliamarsh, andMethanomicrobialesand ZC-Ι in theC. lasiocarpamarsh. MPP correlated significantly (P= 0.04) with DOC and methanogen population in theC. lasiocarpamarsh but only with DOC in theC. angustifoliamarsh. Addition ofC. lasiocarpalitter enhanced MPP more effectively than addition ofC. angustifolialitter, indicating that temporal variation of substrates is controlled by litter deposition in theC. lasiocarpamarsh while living plant matter is more important in theC. angustifoliamarsh. This study indicated that there was no apparent shift in the dominant types of methanogen during the growth season in the species-specific freshwater wetlands. Temporal variation of MPP is controlled by substrates and substrate-driven changes in the abundance of methanogenic archaea in theC. lasiocarpamarsh, while MPP depends only on substrate availability derived from root exudates or soil organic matter in theC. angustifoliamarsh.