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首页> 外文会议>Functions of natural organic matter in changing environment >Soil Organic Carbon Sequestration under Long-Term Manure and Straw Fertilization in North and Northeast China by Roth-C Model Simulation
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Soil Organic Carbon Sequestration under Long-Term Manure and Straw Fertilization in North and Northeast China by Roth-C Model Simulation

机译：Roth-C模型模拟对华北和东北长期施肥和秸秆还田下土壤有机碳固存

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Soil organic carbon (SOC) modeling is a useful approach to assess the impact of natural organic material management on carbon sequestration.RothC was parameterised and validated with two long-term experiments comparing different manure,straw and chemical fertilizer treatments in north (Zhengzhou) and northeast (Gongzhuling) China.Four fertilizer treatments were used:no fertilizer (Control),nitrogen-phosphorus-potassium fertilizer combined (NPK),NPK fertilizer and manure (NPKM),and NPK fertilizer with straw return (NPKS).The comparison between simulated and observed data showed that the model can adequately simulate SOC contents in the Control,NPK and NPKM treatments but over-estimated in the NPKS treatment at both sites.By changing the value of Decomposable Plant Material / Resistant Plant Material ratio from the default value to 3.35 for the NPKS treatment at the Zhengzhou site,dynamics of simulated SOC agreed with measured values.A pseudo-parameter,straw retention factor,was introduced to adjust the amount of straw incorporated into soils.Using the inverse simulation method and the modified value of the ratio,the best-fitted value was 0.32 for the NPKS treatment at the Gongzhuling site.Along with the modification,the model can produce reasonable results at the site.The model was run for another 30 years with the modified parameter values and current average climatic conditions for different fertilization scenarios at both sites.The results suggested that the NPK application plus the addition of manure or straw would be better management practices for carbon sequestration.
机译：土壤有机碳（SOC）建模是评估天然有机材料管理对固碳影响的有用方法.RothC的参数化和两个长期实验比较了郑州和北方的不同肥料，秸秆和化肥处理，并进行了验证东北（公主岭）。使用了四种肥料：不施肥（对照），氮磷钾钾肥（NPK），NPK肥料和肥料（NPKM）以及带秸秆还田的NPK肥料（NPKS）。模拟和观察数据表明，该模型可以充分模拟对照，NPK和NPKM处理中的SOC含量，但在两个站点的NPKS处理中都高估了。通过将可分解植物材料/抗植物材料比值从默认值更改对郑州站点进行的NPKS处理，其数值为3.35，模拟的SOC动力学与测量值一致。引入了伪参数，稻草保留因子使用逆模拟方法和该比例的修正值，在公主岭地区进行NPKS处理的最佳拟合值为0.32。随着修正的进行，该模型可以产生合理的结果。该模型还运行了30年，使用了修改后的参数值和当前两个地点不同施肥情况下的当前平均气候条件，运行了30年。固碳。

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