基于Century模型的麦玉两熟农田土壤固碳潜力研究——以河南省襄城县为例  

Study on Soil Carbon Sequestration Potential of Wheat and Maize Double-Cropping Farmland Based on Century Model——A Case Study of Xiangcheng County,Henan Province

作　　者：袁晨光 宋艳华[1] 田梦 樊鹏[1] 杨青伟[1] 杨喜会 YUAN Chenguang;SONG Yanhua;TIAN Meng;FAN Peng;YANG Qingwei;YANG Xihui(Institute of Geographical Sciences,Henan Academy of Sciences,Zhengzhou 450052)

机构地区：[1]河南省科学院地理研究所,郑州450052

出　　处：《中国农学通报》2024年第35期70-75,共6页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金项目“条带覆盖免耕调控黑土农田水分入渗的生物孔隙机制”(42407436);河南省科技研发计划联合基金项目“降水线北移对豫西耕地关键生态过程及耕地质量影响机制研究”(235200810045);河南省软科学研究计划项目“河南省小麦—玉米两熟农田固碳能力时空动态演变特征、机制及潜力估算(242400410573)”;河南省科技攻关计划项目“基于土壤孔隙结构的农田土壤水分承载力模型构建及其应用技术研究”(242102110225);河南省科学院科技智库研究项目“黄淮海平原小麦—玉米两熟农田固碳能力时空动态演变特征、机制和潜力估算”(240701008)。

摘　　要：为研究农田土壤固碳潜力和有效的农业管理措施,选取河南省襄城县一个麦玉两熟农田长期监测点作为研究对象,运用Century模型模拟监测期间(2010—2023年)土壤有机碳的动态变化过程,并与实测数据进行对比,验证Century模型的适用性。同时选取一种基础农业管理措施和4种优化后的农业管理措施,运用Century模型模拟预测未来20 a(2024—2043年)的土壤固碳潜力。监测点在监测期的土壤有机碳密度年均增加0.31 Mg/hm^(2),呈现“碳汇”状态,原因主要是增加了氮肥施用量。Century模型验证结果显示:模型在模拟和预测土壤有机碳动态变化过程中具有良好的适用性,其中基础农业管理措施条件下土壤固碳潜力较低,保持较弱“碳汇”状态且状态较为稳定,而少耕和50%秸秆还田相结合的农业管理措施条件对土壤有机碳动态变化过程影响最大,土壤固碳潜力最高,是最为有效的农业管理措施。在河南省麦玉两熟农田地区实施和推广优化后的农业管理措施是提升土壤固碳能力的重要手段,对缓解温室效应和实现国家粮食安全具有重要意义。To study the soil carbon sequestration potential,a long-term monitoring site of wheat and maize double-cropping farmland in Xiangcheng County,Henan Province was selected as the research object.The Century model was used to simulate the dynamic change process of soil organic carbon during the monitoring period(2010-2023),and the applicability of the Century model was verified by comparing with the measured data.At the same time,one basic agricultural management measure and four optimized agricultural management measures were selected to simulate and predict the soil carbon sequestration potential in the next 20 years(2024-2043)by using the Century model.The simulation results showed that during the monitoring period,soil organic carbon density at the monitoring sites increased by 0.31 mg/hm^(2) annually,showing a“carbon sink”status,mainly due to the increase of nitrogen fertilizer application rate.The results of Century model validation found that the model had good applicability in simulating and predicting the dynamic change of soil organic carbon.Under the condition of basic agricultural management measures,the soil carbon sequestration potential was low,and the state was weak and stable.Under the condition of agricultural management measures combining less tillage and 50%straw returning,the soil carbon sequestration potential was the highest,which was the most effective agricultural management measure.Therefore,the implementation and popularization of optimized agricultural management measures in the wheat and maize double-cropping farmland area of Henan Province is an important means to enhance soil carbon sequestration capacity,which is of great significance for alleviating greenhouse effect and realizing national food security.

关 键 词：土壤固碳潜力 麦玉两熟农田 Century模型 农业管理措施 襄城县 

分 类 号：S153.6[农业科学—土壤学]