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集约农田土壤有机碳动态对作物可持续生产有重要意义。本研究基于碳固持CQESTR模型,在国内短期、中长期物料填埋试验资料基础上进行修正,将CQESTR模型按照物料降解与累积积温关系划分4个阶段,确定了不同降解阶段的物料类型因子。通过对黄淮海平原集约化农区7个独立肥料长期定位点1151组耕层土壤有机质观测值与模拟值进行验证,模型模拟95%置信区间为1.91g·kg-1,r2=0.91。修正的CQESTR模型可以预测不同种植和管理措施下作物残体、外源有机物料及土壤有机质的矿化,从而对集约耕作条件下土壤有机碳矿化和固持进行评价。
The dynamics of soil organic carbon in intensive farmland are of great importance to the sustainable production of crops. Based on the carbon-bound CQESTR model, this study was revised on the basis of short-term and medium-long-term landfill test data in China. The CQESTR model was divided into four stages according to the relationship between material degradation and accumulated temperature, and the material type factors at different degradation stages were determined. The observed and simulated values of soil organic matter in 1151 tillage layers of 7 long-standing independent fertilizers sites in the Integrative Huanghuaihai Plain were validated. The model 95% confidence interval was 1.91g · kg-1 with r2 = 0.91. The modified CQESTR model can predict the mineralization of crop residues, exogenous organic materials and soil organic matter under different planting and management measures, and evaluate the mineralization and holding of soil organic carbon under intensive farming.