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首页> 外文期刊>Ecosystems >Large Greenhouse Gas Emissions from a Temperate Peatland Pasture
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Large Greenhouse Gas Emissions from a Temperate Peatland Pasture

机译：温带泥炭地牧场的大型温室气体排放

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Agricultural drainage is thought to alter greenhouse gas emissions from temperate peatlands, with CH sub(4) emissions reduced in favor of greater CO sub(2) losses. Attention has largely focussed on C trace gases, and less is known about the impacts of agricultural conversion on N sub(2)O or global warming potential. We report greenhouse gas fluxes (CH sub(4), CO sub(2), N sub(2)O) from a drained peatland in the Sacramento-San Joaquin River Delta, California, USA currently managed as a rangeland (that is, pasture). This ecosystem was a net source of CH sub(4) (25.8 plus or minus 1.4mgCH sub(4[/s ubscript]-Cm) super(-)2 sub([)su perscript]-1 and N sub(2)O (6.4 plus or minus 0.4mgN sub(2[/sub script]O-Nm) super(-)2 sub([)sup erscript]-1. Methane fluxes were comparable to those of other managed temperate peatlands, whereas N sub(2)O fluxes were very high; equivalent to fluxes from heavily fertilized agroecosystems and tropical forests. Ecosystem scale CH sub(4) fluxes were driven by "hotspots" (drainage ditches) that accounted for less than 5% of the land area but more than 84% of emissions. Methane fluxes were unresponsive to seasonal fluctuations in climate and showed minimal temporal variability. Nitrous oxide fluxes were more homogeneously distributed throughout the landscape and responded to fluctuations in environmental variables, especially soil moisture. Elevated CH sub(4) and N sub(2)O fluxes contributed to a high overall ecosystem global warming potential (531gCO sub(2)-C equivalents m super(-2)y super(- 1)), with non-CO sub(2) trace gas fluxes offsetting the atmospheric "cooling" effects of photoassimilation. These data suggest that managed Delta peatlands are potentially large regional sources of greenhouse gases, with spatial heterogeneity in soil moisture modulating the relative importance of each gas for ecosystem global warming potential.
机译：人们认为，农业排水会改变温带泥炭地的温室气体排放量，减少CH sub（4）的排放量有利于更大的CO sub（2）损失。人们将注意力主要集中在C微量气体上，而对农业转化对N sub（2）O或全球变暖潜力的影响知之甚少。我们报告了目前由美国加利福尼亚州萨克拉曼多-圣华金河三角洲的一个排干的泥炭地排放的温室气体通量（CH sub（4），CO sub（2），N sub（2）O）。牧场）。该生态系统是CH sub（4）（25.8正负1.4mgCH sub（4 [/ s脚本] -Cm）super（-）2 sub（[] su上标] -1和N sub（2）的净源） O（6.4 +/- 0.4mgN sub（2 [/ sub script] O-Nm）super（-）2 sub（[）sup script] -1。甲烷通量与其他管理温带泥炭地相当（2）O通量非常高;相当于来自大量施肥的农业生态系统和热带森林的通量;生态系统CH CH（4）通量是由“热点”（排水沟）驱动的，占土壤面积的不到5％，但超过84％的排放量。甲烷通量对气候的季节性波动无响应，并且显示出最小的时间变化;一氧化二氮通量在整个景观中分布更均匀，并且对环境变量（尤其是土壤水分）的波动做出了响应.CH sub（4）升高和N sub（2）O通量导致整体生态系统总体变暖潜力高（531gCO sub（2）-C当量m sup er（-2）y超级（-1）），非CO sub（2）微量气体通量抵消了光吸收作用的大气“冷却”效应。这些数据表明，受管理的三角洲泥炭地可能是区域性温室气体的主要来源，土壤水分的空间异质性调节了每种气体对生态系统全球变暖潜力的相对重要性。

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