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首页> 外文期刊>Soil Biology & Biochemistry >Greenhouse gas soil production and surface fluxes at a high arctic polar oasis.
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Greenhouse gas soil production and surface fluxes at a high arctic polar oasis.

机译：高北极极绿洲的温室气体土壤生产和地表通量。

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摘要

Arctic vegetation and soil biological communities interact with a range of biotic and abiotic factors to produce or consume the greenhouse gases (GHG) carbon dioxide, methane, and nitrous oxide. In Arctic environments the parameters controlling these processes are not well understood. We measured soil GHG concentrations and surface fluxes from six vegetation communities at a High Arctic polar oasis and adjacent polar deserts in order to identify regions within the soil profile of production and consumption of CO2, CH4, and N2O. Examined communities included two polar deserts differing in parent material and soil pH, and four lowland tundra communities: prostrate dwarf-shrub, herb tundra, prostrate/hemiprostrate dwarf-shrub tundra, nontussock sedge, dwarf-shrub, moss tundra and a sedge/grass, moss wetland, representative of large areas at lower Arctic latitudes. Polar desert soils were net producers of greenhouse gases during the brief High Arctic growing season, including at depths close to the permafrost layer, and effluxes from the surface were of a similar magnitude to nearby mesic and hydric tundra soils including for CO2, indicative of soil respiration in desert soils with few roots. Differences in water content, rather than calculated diffusivity, appear to drive gas transport in at least some soils, with all three GHG appearing to move rapidly through, for example, the soil at 10 cm above permafrost in the Prostrate (dominated by Dryas integrifolia) plant community. Such physical processes may obscure or falsely suggest biological processes in soil ecosystems.
机译：北极植被和土壤生物群落与一系列生物和非生物因素相互作用，以产生或消耗温室气体（GHG）的二氧化碳，甲烷和一氧化二氮。在北极环境中，控制这些过程的参数还不太清楚。我们测量了北极极地绿洲和邻近极地沙漠中六个植被群落的土壤温室气体浓度和表面通量，以便确定土壤中CO 2 ，CH 的生产和消费状况4 和N 2 O。检查的群落包括两个母本和土壤pH值不同的极地荒漠，以及四个低地苔原群落：pro矮灌木林，草本冻原，pro /半矮灌木林苔原，非草莎草，矮灌木，苔藓苔原和莎草/草苔藓湿地，代表北极低纬度地区的大片地区。在短暂的北极高生长季节，极地沙漠土壤是温室气体的净生产者，包括接近永久冻土层的深度，地表的流出量与附近的中等和含水苔原土壤（包括CO 2）相似，表示在很少生根的沙漠土壤中的土壤呼吸。至少在某些土壤中，水分含量的差异而非计算出的扩散系数似乎会推动气体的传输，所有三种温室气体似乎都迅速移动，例如在Prostrate的永冻层上方10 cm处的土壤中（以为主整形树（植物）。这种物理过程可能掩盖或错误地暗示了土壤生态系统中的生物过程。

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