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首页> 外文期刊>Ecosystems >Gaps and Soil C Dynamics in Old Growth Northern Hardwood–Hemlock Forests
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Gaps and Soil C Dynamics in Old Growth Northern Hardwood–Hemlock Forests

机译：北部阔叶铁杉-铁杉老林中的空隙和土壤碳动态

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Old growth forest soils are large C reservoirs, but the impacts of tree-fall gaps on soil C in these forests are not well understood. The effects of forest gaps on soil C dynamics in old growth northern hardwood–hemlock forests in the upper Great Lakes region, USA, were assessed from measurements of litter and soil C stocks, surface C efflux, and soil microbial indices over two consecutive growing seasons. Forest floor C was significantly less in gaps (19.0 Mg C ha?1) compared to gap-edges (39.5 Mg C ha?1) and the closed forest (38.0 Mg C ha?1). Labile soil C (coarse particulate organic matter, cPOM) was significantly less in gaps and edges (11.1 and 11.2 Mg C ha?1) compared to forest plots (15.3 Mg C ha?1). In situ surface C efflux was significantly greater in gaps (12.0 Mg C ha?1 y?1) compared to edges and the closed forest (9.2 and 8.9 Mg C ha?1 y?1). Microbial biomass N (MBN) was significantly greater in edges (0.14 Mg N ha?1) than in the contiguous forest (0.09 Mg N ha?1). The metabolic quotient (qCO2) was significantly greater in the forest (0.0031 mg CO2 h?1 g?1/mg MBC g?1) relative to gaps or edges (0.0014 mg CO2 h?1 g?1/mg MBC g?1). A case is made for gaps as alleviators of old growth forest soil C saturation. Relative to the undisturbed closed forest, gaps have significantly less labile C, significantly greater in situ surface C efflux, and significantly lower decreased qCO2 values.
机译：旧的生长森林土壤是大量的C储层，但是对于这些森林中的树倒隙对土壤C的影响尚不十分了解。通过测量连续两个生长季节的凋落物和土壤碳储量，表面碳外排量和土壤微生物指数，评估了美国美国大湖区北部北部老龄北部硬木-铁杉林中森林缺口对土壤碳动态的影响。 。与间隙边缘（39.5 Mg C ha？1 ）和密林（38.0 Mg C ha？1 ）要少得多。 sup>）。与林地（15.3 Mg C ha？1 ）相比，间隙和边缘的不稳定土壤C（粗粒有机物，cPOM）明显减少（11.1和11.2 Mg C ha？1 ）。与边缘和封闭森林相比，间隙中的原位表面C流出量（12.0 Mg C ha？1 y？1 ）明显更大（9.2和8.9 Mg C ha？1 y） ？1 ）。边缘（0.14 Mg N ha？1 ）的微生物生物量氮（MBN）明显大于连续森林（0.09 Mg N ha？1 ）。森林中的代谢商（qCO2 ）相对较高（0.0031 mg CO2 h？1 g？1 / mg MBC g？1 ）到缝隙或边缘（0.0014 mg CO2 h？1 g？1 / mg MBC g？1 ）。提出了作为缓解老龄森林土壤C饱和度的空白的理由。相对于未受干扰的封闭森林，间隙的不稳定碳含量显着降低，原位地表碳释放量显着提高，qCO2降低值显着降低。

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