Diffusion GHG fluxes at tropical peatland drainage canal water surfaces.
Diffusion GHG fluxes at tropical peatland drainage canal water surfaces.
复制标题
热带泥炭地排水渠水面的温室气体扩散通量。
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
H. Silvennoinen
中科院分区：
文献类型：
--
作者：
J. Jauhiainen;H. Silvennoinen
关于热带泥炭地排水渠上方水面和大气之间温室气体(GHG)交换的数据在文献中缺乏。我们对两个典型的复垦泥炭地进行了CO2、CH4和N2O在水面和大气之间的扩散通量的量化。一个地点是坎帕尔半岛(苏门答腊岛)的工业纸浆木材种植园，另一个是加里曼丹(婆罗洲)的废弃泥炭地。在雨季和旱季，采用浮动式密闭水箱测量了排水渠道的通量。在不同的土地利用历史以及运河生物环境和水文特征所造成的一系列条件下，确定了这些地点的通量。运河系统的气体通量受到各自周围泥炭地面积、季节和运河管理的影响。与加里曼丹遗址相比，坎帕尔遗址最近开垦的定居(未受干扰)运河的所有三种气体的通量都更高。一般情况下，来自运河的二氧化碳、甲烷和N2O的平均通量分别为9-16、0.10-1.1和0-0.003 g m-2d-1。坎帕尔运河中这三种温室气体的年累计排放量(13.8千克二氧化碳当量m-2y-1)几乎是加里曼丹工厂(4.8千克二氧化碳当量m-2y-1)的三倍。当计算枯水期和雨季的通量时，定居运河中三种气体的平均通量和Kampar站点的累积年排放量都高于扰动的运河。CH4和N2O的通量在最近的渠道清理(即处于扰动状态)时尤其减少。就相对全球变暖潜势(GWP)而言，CO2是加里曼丹定居运河(69%的温室气体排放归因于CO2)和Kampar遗址扰动运河(82%)三种温室气体中最重要的，而Kampar遗址定居运河中CH4占年总排放量的61%。在加里曼丹定居运河，甲烷占总累积当量年排放量的31%。N2O在各站点中的作用很小(占累积通量的0-2%)。在单位面积基础上，与周围泥炭地相比，形成的排水渠的温室气体排放量通常是更高的排放源，而且运河中三种温室气体对总排放量的贡献比陆地上的更不同。
Data on greenhouse gas (GHG) exchange between water surfaces and the atmosphere above tropical peatland drainage canals are lacking in the literature. We quantified diffusion fluxes of CO2, CH4 and N2O between the water surface and the atmosphere for two typical reclaimed peatland sites. One site was an industrial pulp wood plantation in the Kampar Peninsula (Sumatra) and the other was an abandoned peatland area in Kalimantan (Borneo). Drainage canal fluxes were measured by using floating closed chambers during both the wet and dry seasons. Fluxes at the sites were determined across a range of conditions that were created by varying land use histories, and also by canal biotic environment and hydrological features. Gas fluxes in the canal systems were influenced by their respective surrounding peatland areas, the season, and canal management. Fluxes of all three gases were higher at the more recently reclaimed settled (undisturbed) canals of the Kampar site in comparison to the Kalimantan site. In general, the mean flux from the canals ranged from 9–16, 0.1–1.1 and 0–0.003 g m–2 d–1 for CO2, CH4 and N2O, respectively. A cumulative equivalent annual emission of these three GHGs from canals was nearly three times higher at the Kampar site (13.8 kg CO2e m–2 y–1) than that at the Kalimantan site (4.8 kg CO2e m–2 y–1). Mean fluxes of the three gases and the cumulative annual emission at the Kampar site were higher in the settled canals in comparison to the disturbed canals when both dry and wet season fluxes were calculated. The fluxes of CH4 and N2O especially decreased when canals had been recently cleaned (i.e. were in disturbed condition). In terms of their relative global warming potentials (GWP), CO2 was the most important of the three GHG’s both at the Kalimantan site settled canal (69% of the fluxes were attributed to CO2) and at the disturbed canals at the Kampar (82%) site, whereas CH4 dominated in settled canals at the Kampar site at 61% contribution to the total annual emission. CH4 contributed 31% to the total cumulative equivalent annual emission at the Kalimantan settled canal. N2O had only a minor role (0–2% of the cumulative fluxes) at the sites. On a unit area basis, GHG emissions from the drainage canals formed were generally higher emission sources in comparison to the surrounding peatland, and proportional contributions from the three GHG species to the total were more diverse in canals than on land.