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首页> 外文期刊>Soil Research >Relationship between environmental and land-use variables on soil carbon levels at the regional scale in central New South Wales, Australia. (Special Issue: Soil carbon in Australia's agricultural lands.)
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Relationship between environmental and land-use variables on soil carbon levels at the regional scale in central New South Wales, Australia. (Special Issue: Soil carbon in Australia's agricultural lands.)

机译：澳大利亚新南威尔士州中部地区尺度上环境与土地利用变量对土壤碳水平的关系。 （特刊：澳大利亚农业用地的土壤碳。）

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摘要

The potential to change agricultural land use to increase soil carbon stocks has been proposed as a mechanism to offset greenhouse gas emissions. To estimate the potential carbon storage in the soil from regional surveys it is important to understand the influence of environmental variables (climate, soil type, and landscape) before land management can be assessed. A survey was done of 354 sites to determine soil organic carbon stock (SOC stock; Mg C/ha) across the Lachlan and Macquarie catchments of New South Wales, Australia. The influences of climate, soil physical and chemical properties, landscape position, and 10 years of land management information were assessed. The environmental variables described most of the regional variation compared with management. The strongest influence on SOC stock at 0-10 cm was from climatic variables, particularly 30-year average annual rainfall. At a soil depth of 20-30 cm, the proportion of silica (SiO2) determined by mid-infrared spectra (SiMIR) had a negative relationship with SOC stock, and sand and clay measured by particle size analysis also showed strong relationships at sites where measured. Of the difference in SOC stock explained by land use, cropping had lower soil carbon than pasture in rotation or permanent pasture at 0-10 cm. This relationship was consistent across a rainfall gradient, but once soil carbon was standardised per mm of average annual rainfall, there was a greater difference between cropping and permanent pasture with increasing SiMIR in soils. Land use is also regulated by climate, topography, and soil type, and the effect on SOC stock is better assessed in smaller land-management units to remove some variability due to climate and soil.
机译：已经提出了改变农业土地用途以增加土壤碳储量的潜力，作为抵消温室气体排放的一种机制。为了通过区域调查估算土壤中的潜在碳存储量，在评估土地管理之前，了解环境变量（气候，土壤类型和景观）的影响非常重要。对354个站点进行了调查，以确定澳大利亚新南威尔士州拉克兰和麦格理流域的土壤有机碳储量（SOC储量; Mg C / ha）。评估了气候，土壤理化性质，景观位置和10年土地管理信息的影响。与管理相比，环境变量描述了大多数区域差异。在0-10厘米处，对SOC储量的影响最大的是气候变量，尤其是30年的年平均降雨量。在20-30 cm的土壤深度下，由中红外光谱（Si MIR ）确定的二氧化硅（SiO 2 ）的比例与SOC存量呈负相关，通过粒度分析测量的沙子和粘土在所测量的位置也显示出很强的关系。在土地用途解释的SOC存量差异中，耕作的土壤碳含量低于轮作或永久牧场（0-10厘米）的牧场。这种关系在整个降雨梯度上是一致的，但是一旦土壤碳被标准化为每毫米年平均降雨量，随着土壤中Si MIR 的增加，耕种和永久性牧场之间的差异就更大。土地使用还受到气候，地形和土壤类型的调节，在较小的土地管理单位中，可以更好地评估对SOC的影响，以消除由于气候和土壤而引起的某些变化。

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