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首页> 外文期刊>Waste management & research >Laboratory-scale measurements of N_2O and CH_4 emissions from hybrid poplars (Populus deltoids X Populus nigra)
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Laboratory-scale measurements of N_2O and CH_4 emissions from hybrid poplars (Populus deltoids X Populus nigra)

机译：杂交杨的N_2O和CH_4排放的实验室规模测量（Populus deltoids X Populus nigra）

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The purpose of this study was to determine whether or not young hybrid poplar (Populus deltoides x Populus nigra) could transport landfill biogas internally from the root zone to the atmosphere, thereby acting as conduits for landfill gas release. Fluxes of methane (CH_4) and nitrous oxide (N_2O) from the seedlings to the atmosphere were measured under controlled conditions using dynamic flux chambers and a tunable diode laser trace gas analyser (TDLTGA). Nitrous oxide was emitted from the seedlings, but only when extremely high soil N_7O concentrations were applied to the root zone. In contrast, no detectable emissions of CH, were measured in a similar experimental trial. Visible plant morphological responses, characteristic of flood-tolerant trees attempting to cope with the negative effects of soil hypoxia, were observed during the CH_4 experiments. Leaf chlorosis, leaf abscission and adventitious roots were all visible plant responses. In addition, seedling survival was observed to be highest in the biogas 'hot spot' areas of a local municipal solid waste landfill involved in this study. Based on the available literature, these observations suggest that CH4 can be transported internally by Populus deltoides X Populus nigra seedlings in trace amounts, although future research is required to fully test this hypothesis.
机译：这项研究的目的是确定杂种杨（Populus deltoides x Populus nigra）是否可以将垃圾填埋沼气从根部内部输送到大气中，从而充当垃圾填埋气体释放的渠道。使用动态通量室和可调谐二极管激光痕量气体分析仪（TDLTGA）在受控条件下测量了从幼苗到大气的甲烷（CH_4）和一氧化二氮（N_2O）的通量。一氧化二氮从幼苗中散发出来，但是只有在根部区域施用极高的土壤N_7O浓度时才释放。相比之下，在类似的试验中未检测到CH的可检测排放。在CH_4实验期间，观察到了可见的植物形态学响应，这是试图应对土壤缺氧的负面影响的耐水树木的特征。叶片萎黄，叶片脱落和不定根都是可见的植物反应。此外，在该研究涉及的当地城市固体垃圾掩埋场的沼气“热点”区域中，幼苗存活率最高。根据现有的文献，这些观察结果表明，尽管可以进行进一步的测试以验证这一假设，但三角洲杨X黑杨幼苗可以内部运输CH4。

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