The role of cotton-grass (Eriophorum vaginatum) in the exchange of CO2 and CH4 at two restored peatlands, eastern Canada1
The role of cotton-grass (Eriophorum vaginatum) in the exchange of CO2 and CH4 at two restored peatlands, eastern Canada1
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棉草（Eriophorum vaginatum）在加拿大东部两个恢复泥炭地二氧化碳和甲烷交换中的作用1
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
T. Moore
中科院分区：
文献类型：
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作者：
M. Marinier;S. Glatzel;T. Moore
翻译后摘要：我们测量了甲烷（CH 4）和二氧化碳（CO2）的交换从裸露的泥炭和羊胡子草ssp。在三个生长季节（5月至10月）内，在新玩法的希帕甘和魁北克的里维埃杜卢附近最近恢复收获的泥炭地，采集了一批spissum草丛。季节平均CH 4排放速率变化范围为-1 ~65 mg·m-2·d-1，与地下水位位置的关系一般较弱。甲烷排放量与地上植物生物量之间的关系更为密切。CH 4排放通量来自E. vaginatum草丛大于那些从裸泥炭表面和增加地上生物量和光合速率。从草丛中剪下新鲜的叶子，减少了79%的CH 4排放率。草丛中的光合速率较大，在高光水平下为0.9至3.4 g CO2-C·m-2·h-1，呼吸速率（自养+异养）为-0.1至-1.3 g CO2-C·m-2·h-1。一些草丛表现出净二氧化碳损失到大气中，即使在强光下。尽管E. vaginatum有助于其他维管植物和苔藓的发育，它增加了CH 4到大气中的通量，并且在泥炭表面上提供很少或没有净C积累。
Abstract: We measured methane (CH4) and carbon dioxide (CO2) exchanges from bare peat and Eriophorum vaginatum ssp. spissum tussocks at recently restored harvested peatlands near Shippagan, New Brunswick and Rivière-du-Loup, Québec over three growing seasons (May to October). Average seasonal CH4 emission rates ranged from -1 to 65 mg·m-2·d-1, with a generally weak relationship with water table position. A stronger relationship was seen between CH4 emissions and above-ground plant biomass. CH4 fluxes from E. vaginatum tussocks were larger than those from bare peat surfaces and increased with increasing above-ground biomass and photosynthetic rate. Clipping fresh leaves from tussocks reduced the CH4 emission rates by 79%. Photosynthesis rates were large in tussocks, ranging from 0.9 to 3.4 g CO2-C·m-2·h-1 at high light levels, and respiration rates (autotrophic + heterotrophic) ranged from -0.1 to -1.3 g CO2-C·m-2·h-1. Some tussocks exhibited net CO2 loss to the atmosphere, even under high light levels. Although the rapid colonization of restored peat surfaces by E. vaginatum aids the development of other vascular plants and mosses, it increases the flux of CH4 to the atmosphere and provides little or no net C accumulation on the peat surface.