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首页> 外文期刊>Soil Research >Combining management based indices with environmental parameters to explain regional variation in soil carbon under dryland cropping in South Australia. (Special Issue: Soil carbon in Australia's agricultural lands.)
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Combining management based indices with environmental parameters to explain regional variation in soil carbon under dryland cropping in South Australia. (Special Issue: Soil carbon in Australia's agricultural lands.)

机译：将基于管理的指标与环境参数相结合，以解释南澳大利亚旱地种植条件下土壤碳的区域变化。 （特刊：澳大利亚农业用地的土壤碳。）

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摘要

Identifying drivers of variation in soil organic carbon (OC) at a regional scale is often hampered by a lack of historical management information. Focusing on red-brown-earth soils (Chromosol) under dryland agriculture in the Mid-North and Eyre Peninsula of South Australia, our aims were 2-fold: (i) to provide a baseline of soil OC stocks (0.3 m) and OC fractions (mid-infrared predictions of particulate, humus, and resistant OC in 0.1 m samples) in cropping and crop-pasture systems; and (ii) to evaluate whether the inclusion of management-based indices could assist in explaining regional-level variation in OC stocks and fractions. Soil OC stocks in both regions varied ~20 Mg ha-1, with higher OC stocks in the Mid-North (38 Mg ha-1) than the Eyre Peninsula (29.1 Mg ha-1). The humus OC fraction was the dominant fraction, while the particulate OC was the most variable. Environmental variables only partially explained soil OC variability, with vapour pressure deficit (VPD) offering the greatest potential and likely acting as an integrator of temperature and moisture on plant growth and decomposition processes. Differences between broad-scale cropping and crop-pasture systems were limited. In the Mid-North, variability in soil OC stocks and fractions was high, and could not be explained by environmental or management variables. Higher soil OC concentrations (0.1 m) in the Eyre Peninsula cropping than crop-pasture soils were largely accounted for in the particulate OC fraction and are therefore unlikely to represent a long-term stable OC pool. Use of the management data in index format added some explanatory power to the variability in OC stocks over the main environmental variables (VPD, slope) within the Eyre Peninsula cropping soils only. In the wider context, the management data were useful in interpreting differences between regional findings and highlighted difficulties in using uninformed, broad-scale management categories.
机译：缺乏历史管理信息常常会阻碍在区域范围内确定土壤有机碳（OC）变化的驱动因素。我们着眼于南澳大利亚中北部和艾尔半岛干旱地区农业下的红棕壤土壤（Chromosol），我们的目标是2倍：（i）提供土壤OC储量（0.3 m）和OC的基准作物和作物-牧草系统中的分数（0.1 m样品中的微粒，腐殖质和抗性OC的中红外预测）; （ii）评估是否包括基于管理的指数是否有助于解释OC存量和分数的区域水平差异。两个地区的土壤OC储量变化范围都在〜20 Mg ha -1 ，中北部的OC储量（38 Mg ha -1 ）比Eyre半岛（29.1）高。镁ha -1 ）。腐殖质OC分数是主要成分，而颗粒OC则变化最大。环境变量仅部分解释了土壤OC的变异性，蒸气压亏缺（VPD）提供了最大的潜力，并可能在植物生长和分解过程中充当温度和水分的积分器。大规模种植和作物牧草系统之间的差异是有限的。在中北部，土壤OC储量和馏分的变异性很高，无法用环境或管理变量来解释。在艾尔半岛种植的土壤中，OC浓度高于作物-牧草土壤中的OC浓度（0.1 m），这在颗粒OC含量中占很大比例，因此不太可能代表长期稳定的OC池。仅以索引格式使用管理数据，就可以为仅在艾尔半岛种植土壤中的主要环境变量（VPD，坡度）上的OC储量的变异性提供一定的解释能力。在更广泛的背景下，管理数据有助于解释区域调查结果之间的差异，并突出说明了在使用不了解情况的大规模管理类别时的困难。

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