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首页> 外文期刊>Soil Science Society of America Journal >Spatial Variability in Properties Affecting Organic Horizon Carbon Storage in Upland Soils
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Spatial Variability in Properties Affecting Organic Horizon Carbon Storage in Upland Soils

机译：影响旱地土壤有机层碳储量特性的空间变异

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Quantifying the amount and distribution of soil organic carbon (SOC) within natural soils is important for sample design, C budgeting/pool estimation, and understanding SOC turnover at a process level. We examined the distribution of SOC across a typical UK upland, moorland catchment to establish the amount and spatial structure of variability in key soil properties affecting SOC stocks, namely O horizon C content, bulk density (D sub(B)) and horizon depth. Organic horizons of Histosols and Gleysols had greater SOC contents but smaller bulk densities than Podzols and Leptosols. Consequently, SOC density differences between soils were minimized and horizon depth variation became crucial to the measurement of SOC stocks. However, individual Podzol profiles stored appreciable amounts of SOC in O horizons (up to 50 kg m super(-2)). Geostatistical analyses showed spatially structured variance in many properties relating to SOC storage at both plot (variograms reaching sills at ranges 3-8 m) and catchment scales (ranges 437-529 m). The increase in variance from plot to catchment scales was large for O horizon depth. However, D sub(B) showed complex scale and soil type inter-relationships, with similar variance at different scales. We show that detailed soil investigations spanning multiple spatial scales are necessary to quantify soil C storage properties for purposes of hydro-ecological modeling and C budgeting at small catchment scales. This has implications for upscaling to regional or national soil C databases.
机译：量化天然土壤中土壤有机碳（SOC）的数量和分布对于样品设计，碳预算/池估计以及了解过程级别的SOC转换非常重要。我们研究了典型的英国高地，荒地流域的SOC分布，以确定影响SOC储量的关键土壤特性（即O地平线C含量，堆积密度（D sub（B））和地平线深度）的数量和空间结构。与Podzols和Letotosols相比，Histosols和Gleysols的有机层具有更高的SOC含量，但体积密度较小。因此，土壤之间的SOC密度差异最小，并且水平深度变化对于SOC储量的测量变得至关重要。但是，单独的Podzol配置文件在O层中存储了相当数量的SOC（最多50 kg m super（-2））。地统计分析表明，在两个图上（在3-8 m范围内到达底槛的方差图）和集水规模（在437-529 m范围内），与SOC储存相关的许多属性在空间结构上均存在差异。对于O层深度，从样地到集水区尺度的方差增加很大。然而，D sub（B）显示出复杂的尺度和土壤类型的相互关系，不同尺度下的方差相似。我们表明，跨越多个空间尺度的详细土壤调查对于量化土壤C的存储特性是必要的，目的是在小流域尺度上进行水生态模型和C预算。这对升级到区域或国家土壤碳数据库具有影响。

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