植物营养与肥料学报2025，Vol.31Issue(9)：1713-1723,11.DOI:10.11674/zwyf.2024630
基于DNDC和RothC模型的农田土壤有机碳动态模拟研究
Modelling soil organic carbon dynamics of cropland based on DNDC and RothC models
摘要
Abstract
[Objectives]The DNDC and RothC models with different levels of complexity were used to simulate the dynamics of soil organic carbon(SOC)for dryland field under different amounts of straw return.The model results were compared and the causes for the differences of model simulations of two models were investigated,which provides references for model selections of cropland SOC modeling.[Methods]The experimental data(climate,soil,crop,etc.)were obtained from the long-term field experiment at Changping Soil Quality National Observation and Research Station,which started in 2008 and included three treatments,namely,single application of chemical fertilizer(NPK),chemical fertilizer plus crop straw(NPKS)and chemical fertilizer plus organic fertilizer(NPKM).The DNDC and RothC models were used to simulate the dynamic changes of SOC in the dryland,and the measured 0-20 cm SOC density in the tillage layer was applied to calibrate and validate the models.Based on the validated models,the simulation results of SOC dynamics were compared and analyzed under the scenarios of different straw return rates(0,2250 and 4500 kg/hm2).[Results]Overall,both models achieved good simulation results for the SOC in the tillage layer,with the nRMSE less than 20%,the absolute value of nARE less than 15%,and the r ranging from 0.69 to 0.91,which indicated that both models were suitable for simulating the SOC dynamics of the dryland in this study area.With the increase of simulation years,the SOC densities under different straw return scenarios all showed a gradual increase,but the increase rate gradually slowed down,and the more straw return,the more obvious the increase in SOC density.Due to differences in how the two models calculate root-derived carbon input,the predicted changes in SOC also vary.By the 190th year of the projection,the DNDC model showed that under the scenarios of no straw return,half straw return,and full straw return,SOC density increased by 39%,95%,and 147%,respectively,compared to the first year of the projection.In contrast,the RothC model predicted increases of 104%,206%,and 307%in SOC density under the same scenarios.[Conclusions]Both the DNDC and RothC models performed well in simulating SOC dynamics in dryland soils and showed similar trends in predicting SOC changes under different straw return scenarios.Due to its simpler structure and fewer input parameters,the RothC model is suitable for rapid SOC simulation and assessment.In dryland soils,it can replace the DNDC model for predicting SOC dynamics under straw return practices.On the other hand,the DNDC model simulates complex crop growth and soil biogeochemical cycles,making it more suitable for comprehensive simulation and assessment of the agroecosystem.关键词
DNDC模型/RothC模型/土壤有机碳/秸秆还田/旱地农田Key words
DNDC model/RothC model/soil organic carbon/straw return/dryland farmland引用本文复制引用
于晟玥,雷秋良,刘宏斌,张昊鑫,杜新忠,安妙颖,樊秉乾,刘俊梅,张豪强,董永清,武淑霞..基于DNDC和RothC模型的农田土壤有机碳动态模拟研究[J].植物营养与肥料学报,2025,31(9):1713-1723,11.基金项目
鄂尔多斯市"揭榜挂帅"项目(JBGS-2021-001) （JBGS-2021-001）
黑土地保护与利用科技创新工程专项(XDA28130200) （XDA28130200）
中央级公益性科研院所基本科研业务费专项(1610132024010) （1610132024010）
国家自然科学基金项目(U20A20114). （U20A20114）
