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首页> 外文期刊>Soil Science Society of America Journal >Carbon Storage in Coarse and Fine Fractions of Pacific Northwest Old-Growth Forest Soils
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Carbon Storage in Coarse and Fine Fractions of Pacific Northwest Old-Growth Forest Soils

机译：西北太平洋老龄林土壤粗粒和细粒中的碳储量

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Many assessments of soil C have been restricted to the 2-mm fractions of forest mineral soils. Our objective was to determine the importance of the >2-mm fraction to whole-soil C pools in Pacific Northwest old-growth coniferous forests. Seventy-nine pedons in 18 western Washington and Oregon forests were sampled to a depth of 100 cm. The 2-mm fraction by air-drying, physically crushing soil, and sieving; C was determined by Leco combustion. The >2-mm fraction contained up to 46% of the whole-soil C and averaged 23% for the seven forests that had C in that fraction. Following treatment with sodium hexametaphosphate to disaggregate soil material, up to 20% of whole-soil C remained in the >2-mm fraction. Thus, the >2-mm fraction C appears to be in stable and unstable aggregates, as well as concretions. The whole-soil C in the surface 100 cm of mineral soil ranged from 30 to 400 Mg C ha–1. Multiple regression analysis indicated this C pool was positively related to available water capacity, annual precipitation, and coarse woody debris (r2 = 0.63 to 0.66, n = 18 forests). Similar results were obtained with only the 2-mm fraction does not alter our understanding of the importance of climate and soil texture as controls of soil C pools, but it does affect the quantification of soil C pools in many old-growth forests in the Pacific Northwest.
机译：对土壤C的许多评估仅限于森林矿质土壤的2mm分数 。我们的目标是确定西北老龄针叶林中> 2 mm分数对全土碳库的 重要性。在华盛顿州和俄勒冈州西部的18个森林中取样了79个脚，深度为100厘米。通过风干，物理压碎土壤， 和筛分的2毫米部分； C由Leco燃烧确定。 > 2-mm 分数最多占全土壤C的46％，而在那个分数中有C的七个森林的平均 23％。在用六偏磷酸钠进行 处理以分解土壤 材料后，高达20％的全土壤C残留在> 2-mm的部分中。 因此，> 2-mm的分数C似乎是稳定的和不稳定的 聚集体，以及混凝土。矿物土壤 表面100 cm的全土壤C范围为30至400 Mg C ha –1 。 多元回归分析表明C池与可用水量，年降水量和 粗木屑呈正相关（r 2 = 0.63至0.66，n = 18森林）。仅用2毫米的分数就获得了相似的 结果，并没有改变我们对气候和土壤质地作为土壤C 控制的重要性的理解。池，但它确实会影响西北太平洋地区许多老龄林中土壤碳库的数量。

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    《Soil Science Society of America Journal》 |2004年第6期|2023-2030|共8页
  • 作者

    P. S. Homann; S. M. Remillard; M. E. Harmon; B. T. Bormann;

  • 作者单位

    Dep. of Environmental Sciences, Huxley College of the Environment, Western Washington University, Bellingham WA, 98225-9181,Department of Forest Science, Oregon State University, Corvallis OR, 97331;

    USDA Forest Service Pacific Northwest Research Station, Corvallis OR, 97331,Department of Forest Science, Oregon State University, Corvallis OR, 97331;

    Dep. of Environmental Sciences, Huxley College of the Environment, Western Washington University, Bellingham WA, 98225-9181,Department of Forest Science, Oregon State University, Corvallis OR, 97331;

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