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有读书笔记Soil organic matter dynamics in a North America tallgrass prairie after 9 yr of experimental warming

唐唐 添加于 2011-11-2 00:47 | 2025 次阅读 | 0 个评论

  •  作 者

    Cheng X, Luo Y, Xu X, Sherry R, Zhang Q

  •  摘 要

    The influence of global warming on soil organic matter (SOM) dynamics in terrestrial ecosystems remains unclear. In this study, we combined soil fractionation with isotope analyses to examine SOM dynamics after nine years of experimental warming in a North America tallgrass prairie. Soil samples from the control plots and the warmed plots were separated into four aggregate sizes (>2000 μm, 250–2000 μm, 53–250 μm, and <53 μm), and three density fractions (free light fraction – LF, intra-aggregate particulate organic matter – iPOM, and mineral-associated organic matter – mSOM). All fractions were analyzed for their carbon (C) and nitrogen (N) content, and δ13C and δ15N values. Warming did not significantly effect soil aggregate distribution and stability but increased C4-derived C input into all fractions with the greatest in LF. Warming also stimulated decay rates of C in whole soil and all aggregate sizes. C in LF turned over faster than that in iPOM in the warmed soils. The δ15N values of soil fractions were more enriched in the warmed soils than those in the control, indicating that warming accelerated loss of soil N. The δ15N values changed from low to high, while C:N ratios changed from high to low in the order LF, iPOM, and mSOM due to increased degree of decomposition and mineral association. Overall, warming increased the input of C4-derived C by 11.6 %, which was offset by the accelerated loss of soil C. Our results suggest that global warming simultaneously stimulates C input via shift in species composition and decomposition of SOM, resulting in negligible net change in soil C.

  •  详细资料

    • 文献种类: Journal Article
    • 期刊名称: Biogeosciences
    • 期刊缩写: Biogeosciences
    • 期卷页: 2011年  第8卷 第6期 1487-1498页
    • ISBN: 1726-4189

  • 学科领域 自然科学 » 地球科学

  •  所属群组

    环境科学  

  • 相关链接 DOI URL 

  •  唐唐 的文献笔记  订阅

    升温增强土壤氮循环和流失
    为了揭示全球变暖对土壤碳氮循环的影响，武汉植物园系统生态学学科组程晓莉研究员与美国 Oklahoma大学的骆亦其教授等开展了对此项目的合作研究，运用土壤分馏（soil fractionation）和碳氮稳定同位素方法（δ13C，δ15N）研究9年控制加温对北美高草草原土壤有机碳氮循环的影响机制。
     
    研究发现，虽然9年的温度升高显著增加了C4植物的生产力和碳输入（C input），但没有显著改变土壤有机碳氮含量以及土壤颗粒组成（aggregates）。碳稳定同位素（δ13C）研究结果表明温度升高加速了所有土壤 组分的分解速率。土壤不同组分的分解速率差异显著，轻碳（light fraction）的分解速率高于重碳（intra-aggregate particulate organic matter和mineral-associated organic matter），而大颗粒土壤碳分解速率高于小颗粒土壤。氮稳定同位素（δ15N）研究结果进一步表明增温增强了土壤氮循环和流失，同时，C:N值和 δ15N值的变化阐明了土壤轻碳与近期新鲜植物的碳输入的相关性以及重碳的矿化过程。
     
    该研究结果揭示出气温升高改变了物种的组成增加了碳的输入，同时也增加土壤碳氮的分解作 用，导致土壤有机碳氮库没有显著的变化。该研究结果发表在国际权威地理科学和生态学杂志 Biogeosciences（2011,8:1487-1498；IF=3.59；GEOSCIENCES, MULTIDISCIPLINARY：top6.59%）。
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