Methane flux dynamics in an Irish lowland blanket bog
Methane flux dynamics in an Irish lowland blanket bog
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DOI：
10.1007/s11104-007-9374-6
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发表时间：
2007-10-01
期刊：
影响因子：
4.9
通讯作者：
Byrne, Kenneth A.
中科院分区：
文献类型：
--
作者：
Laine, Anna;Wilson, David;Byrne, Kenneth A.
原始泥炭地是大气甲烷（CH 4）的重要来源。大的时空变化已被观察到的通量率内和之间的泥炭地。变化通常与水位、植被结构、土壤化学和气候变异有关。我们测量了2003-2005年期间在毯子沼泽中的CH 4通量的时空变化。沼泽的表面由不同的植被群落（丘，草坪和凹地）沿沿着水位梯度。CH 4通量测定在每个社区使用箱的方法。回归模型被用来与环境变量的通量，并整合在研究期间的通量。水位是空间变化的最强控制因素;平均通量率在丘状体中最低，在洼地中最高，范围为3至53 mg CH 4 m（-2）day（-1）。在长期高水位的植被群落中，植被的数量和物种组成也是一个很好的指示通量率。我们观察到一个明显的季节变化，主要是由温度控制的通量。年平均通量（6.2克CH 4米（-2）年（-1））与以前对毯状沼泽和大陆隆起沼泽的估计相似。没有观察到年际变化。
Pristine peatlands are a significant source of atmospheric methane (CH4). Large spatio-temporal variation has been observed in flux rates within and between peatlands. Variation is commonly associated with water level, vegetation structure, soil chemistry and climatic variability. We measured spatial and temporal variation in CH4 fluxes in a blanket bog during the period 2003-2005. The surface of the bog was composed of different vegetation communities (hummocks, lawns and hollows) along a water level gradient. CH4 fluxes were measured in each community using a chamber method. Regression modelling was used to relate the fluxes with environmental variables and to integrate fluxes over the study period. Water level was the strongest controller of spatial variation; the average flux rate was lowest in hummocks and highest in hollows, ranging from 3 to 53 mg CH4 m(-2) day(-1). In vegetation communities with a permanently high water level, the amount and species composition of vegetation was also a good indicator of flux rate. We observed a clear seasonal variation in flux that was chiefly controlled by temperature. The annual average flux (6.2 g CH4 m(-2) year(-1)) was similar to previous estimates from blanket bogs and continental raised bogs. No interannual variation was observed.