Abstract The amount of carbon (C) sequestered in soil is related to soil texture, soil management, vegetation, and climatic variation. However, in the Northern Great Plains, little information is available to quantify the effects of soil texture on the C sequestration potential of soils. This work was conducted to develop relationships for C sequestration potential based on soil texture under a variety of agricultural practices. Soil samples were collected from central and southeast North Dakota from sites with differing soil management and cropping systems; this includes native prairie, differing Conservation Reserve Program year classes, no-till, and conventional tillage practices. Particle size analysis was determined on the 0- to 15-cm soil depth using a hydrometer method. Sand fractions were determined by sieving. Carbon analysis was done by a high temperature combustion method. For all sampled soils, total silt (%) was found to be positively correlated (P ⩽ 0.01) to organic C content (percent organic C) and organic C mass (kg m−2 depth−1). Sand was found to be negatively correlated (P ⩽ 0.10) with % organic C and organic C mass. Soil clay content was correlated with organic C mass (P ⩽ 0.05) but not percent organic C. Bulk density was found to be negatively correlated with percent organic C (P ⩽ 0.10). The strong correlation between silt content and soil organic C reflects the greater water holding capacity and plant available water of silt-dominated soils, which, in turn, affect plant productivity and influences C sequestration in soil.

中文翻译：

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北部大平原土壤碳与土壤质地的关系

摘要 土壤中固存的碳 (C) 量与土壤质地、土壤管理、植被和气候变化有关。然而，在大平原北部，可用于量化土壤质地对土壤 C 封存潜力影响的信息很少。开展这项工作是为了根据各种农业实践下的土壤质地开发 C 封存潜力的关系。从北达科他州中部和东南部的土壤管理和种植系统不同的地点收集土壤样品；这包括原生草原、不同的保护保护区计划年级、免耕和传统耕作方法。使用比重计方法对 0 至 15 厘米土壤深度进行粒度分析。通过筛分确定砂分数。碳分析采用高温燃烧法。对于所有采样的土壤，发现总淤泥 (%) 与有机碳含量（有机碳百分比）和有机碳质量（kg m-2 深度-1）呈正相关（P ⩽ 0.01）。发现沙子与有机碳百分比和有机碳质量呈负相关（P ⩽ 0.10）。土壤粘土含量与有机碳质量 (P ⩽ 0.05) 相关，但与有机碳百分比无关。发现堆积密度与有机碳百分比 (P ⩽ 0.10) 呈负相关。淤泥含量与土壤有机碳之间的强相关性反映了以淤泥为主的土壤具有更大的持水能力和植物可用水，这反过来又会影响植物生产力并影响土壤中的碳固存。01) 到有机碳含量（有机碳百分比）和有机碳质量（kg m−2 深度−1）。发现沙子与有机碳百分比和有机碳质量呈负相关（P ⩽ 0.10）。土壤粘土含量与有机碳质量 (P ⩽ 0.05) 相关，但与有机碳百分比无关。发现堆积密度与有机碳百分比 (P ⩽ 0.10) 呈负相关。淤泥含量与土壤有机碳之间的强相关性反映了以淤泥为主的土壤具有更大的持水能力和植物可用水，这反过来又会影响植物生产力并影响土壤中的碳固存。01) 到有机碳含量（有机碳百分比）和有机碳质量（kg m−2 深度−1）。发现沙子与有机碳百分比和有机碳质量呈负相关（P ⩽ 0.10）。土壤粘土含量与有机碳质量 (P ⩽ 0.05) 相关，但与有机碳百分比无关。发现堆积密度与有机碳百分比 (P ⩽ 0.10) 呈负相关。淤泥含量与土壤有机碳之间的强相关性反映了以淤泥为主的土壤具有更大的持水能力和植物可用水，这反过来又会影响植物生产力并影响土壤中的碳固存。发现体积密度与有机碳百分比呈负相关（P ⩽ 0.10）。淤泥含量与土壤有机碳之间的强相关性反映了以淤泥为主的土壤具有更大的持水能力和植物可用水，这反过来又会影响植物生产力并影响土壤中的碳固存。发现体积密度与有机碳百分比呈负相关（P ⩽ 0.10）。淤泥含量与土壤有机碳之间的强相关性反映了以淤泥为主的土壤具有更大的持水能力和植物可用水，这反过来又会影响植物生产力并影响土壤中的碳固存。