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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Loess Plateau check dams can potentially sequester eroded soil organic carbon
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Loess Plateau check dams can potentially sequester eroded soil organic carbon

机译：黄土高原止水坝可能会隔离侵蚀的土壤有机碳

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摘要

Check dams are special soil and water conservation structures in the Loess Plateau, China. They play an important role in intercepting sediments and soil organic carbon (SOC). However, the decomposition of intercepted SOC and the environmental regulations at check dams have not been investigated. We conducted several paired field experiments at both check dams and slope lands in the Yanhe Watershed of the Loess Plateau to examine the characteristics of SOC decomposition at check dams. On average, the SOC mineralization rate in slope lands was approximately three times higher than in check dams. Increased soil moisture and compaction in check dams can constrain carbon mineralization by limiting the oxygen availability of SOC and can isolate substrate carbon from heterotrophic microorganisms. Our results indicate that check dams display a considerable potential for eroded SOC sequestration via reducing the soil respiration rate and highlight the important implications of lateral carbon redistribution and human engineering projects when estimating regional or global ecosystem carbon cycles.
机译：在中国黄土高原，止水坝是特殊的水土保持结构。它们在拦截沉积物和土壤有机碳（SOC）中起着重要作用。但是，尚未对截流坝的截留SOC分解和环境法规进行调查。我们在黄土高原延河流域的止水坝和坡地进行了几次成对的野外试验，以检验止水坝的SOC分解特征。平均而言，斜坡土地上的SOC矿化率大约是止水坝的三倍。土坝中土壤湿度的增加和压实会通过限制SOC的氧气利用率来限制碳的矿化作用，并使底物碳与异养微生物隔离。我们的结果表明，止水坝通过降低土壤呼吸速率显示出潜在的SOC隔离的潜力，并突出了侧向碳再分配和人类工程项目在估算区域或全球生态系统碳循环时的重要意义。

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