Soil Organic Carbon Sequestration under Long-Term Manure and Straw Fertilization in North and Northeast China by Roth-C Model Simulation
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.
Roth-C Simulation model Carbon sequestration Soil organic matter Long-term experiment
Minggang Xu Jinzhou Wang Changai Lu
Institute of Agicultural Resources and Regional Panning,Chinese Academy Agricultural Sciences / Key Laboratory of Crop Nutrition and Fertilization,Ministry of Agriculture,Beijing 100081,China
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
227-229
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）