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首页> 外文期刊>Soil Science Society of America Journal >Soil Carbon and Nitrogen Accumulation in a Forested Debris Flow Chronosequence, California
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Soil Carbon and Nitrogen Accumulation in a Forested Debris Flow Chronosequence, California

机译：森林泥石流时序中的土壤碳和氮积累

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摘要

The role of forest soils in the biogeochemical cycling of C and N is most dynamic during the early stages of soil development. To define C and N trends that occur with soil development in a mixed coniferous forest, a chronosequence formed by debris flows was studied. The accumulation rates of total organic C (TOC) and total N (TN) were evaluated in soils on 10 debris flow deposits, ranging from <1 to 244 yr old. Analysis of the mineral soils was restricted to the 30-cm depth, since this was the depth of the shallowest debris flows. Carbon was found to accumulate in the organic horizons at a rate of 26.5 g m–2 yr–1 throughout the time span of the chronosequence. Total organic C accumulation in the mineral horizons (0–30 cm) occurred from 0 to 82 yr at a rate of 13 g m–2 yr–1, and was nearly stable from 82 to 244 yr. Total N accumulated at a rate of 0.57 g m–2 yr–1 in the organic horizons and a rate of 0.17 g m–2 yr–1 in the mineral horizons (0–30 cm) throughout the 244 yr chronosequence. This study suggests that C accumulation in the upper mineral horizons of young forest soils occurs for 250 yr. Carbon and N accumulation in the organic horizons, however, both follow a linear trend over the 244-yr period. The rates of C accumulation suggest a rapid recovery of the soil organic C pool following disturbance.
机译：在土壤发育的早期，森林土壤在C 和N的生物地球化学循环中的作用最为动态。 定义随着土壤的发展而发生的C和N趋势。 一种针叶林混交林，研究了由碎片 流形成的时间序列。在土壤中，在<1至244岁的10个碎屑 流沉积物上，评估了土壤中总有机C （TOC）和总氮（TN）的累积速率。对 的土壤分析仅限于30 cm深度，因为 是最浅的泥石流的深度。发现碳 在整个有机层中以26.5 gm –2 yr –1 的速率积累。时间序列的时间跨度。矿物层（0–30 cm） 中总 有机碳积累发生于0至82年，速率为13 gm –2 yr –1 ， ，在82至244年内几乎稳定。在有机层 中，总N累积量 为0.57 gm –2 yr –1 在整个244年的时间序列中，矿层 （0–30 cm）中的0.17 gm –2 yr –1 。这项研究 建议在 年轻森林土壤的上部矿物层中积累C长达250年。有机层中的碳和N 积累，但是都遵循244年期间的 线性趋势。碳积累速率 建议在 发生扰动后土壤有机碳库快速恢复。

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  • 来源
    《Soil Science Society of America Journal》 |2009年第5期|1504-1509|共6页
  • 作者

    Judith K. Turk; Robert C. Graham;

  • 作者单位

    Soil and Water Sciences Program, Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521;

    Soil and Water Sciences Program, Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521;

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