TEXTURE, CLIMATE, AND CULTIVATION EFFECTS ON SOIL ORGANIC-MATTER CONTENT IN US GRASSLAND SOILS
TEXTURE, CLIMATE, AND CULTIVATION EFFECTS ON SOIL ORGANIC-MATTER CONTENT IN US GRASSLAND SOILS
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DOI：
10.2136/sssaj1989.03615995005300030029x
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发表时间：
1989-05-01
影响因子：
2.9
通讯作者：
SCHIMEL, DS
中科院分区：
文献类型：
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作者：
BURKE, IC;YONKER, CM;SCHIMEL, DS
土壤有机碳含量是农业生态系统稳定性的主要来源，受多种因素控制，具有复杂的相互作用。这项研究的目的是评估土壤有机碳含量的主要控制措施，并预测区域范围和耕作土壤中碳的分布格局。我们获得了美国中原草原500个牧场和300个耕作土壤的土壤养分和气候数据，并统计分析了碳与土壤质地和气候的关系。区域土壤数据库的回归模型表明，有机碳随降水和粘粒含量的增加而增加，随温度的升高而减少。对耕作土壤和草地土壤的分析表明，耕作造成的碳流失随着降雨量的增加而增加，粘性土壤的相对有机碳流失量最小。回归模型在区域气候数据库中的应用表明，中原草原东北部土壤有机质潜在损失量最大，总体由东向西递减。这些统计数据分析可以与更多的机械模型相结合，以评估土壤有机质形成和周转的控制及其对区域管理的影响。
Soil organic C content, a major source of system stability in agroecosystems, is controlled by many factors that have complex interactions. The purpose of this study was to evaluate the major controls over soil organic carbon content, and to predict regional patterns of carbon in range and cultivated soils. We obtained pedon and climate data for 500 rangeland and 300 cultivated soils in the U.S. Central Plains Grasslands, and statistically analyzed relationships between C and soil texture and climate. Regression models of the regional soils database indicated that organic C increased with precipitation and clay content, and decreased with temperature. Analysis of cultivated and rangeland soils indicated that C losses due to cultivation increased with precipitation, and that relative organic C losses are lowest in clay soils. Application of the regression models to a regional climate database showed potential soil organic matter losses to be highest in the northeastern section of the Central Plains Grasslands, decreasing generally from east to west. These statistical data analyses can be combined with more mechanistic models to evaluate controls of soil organic matter formation and turnover, and the implications for regional management.