南京农业大学学报2025，Vol.48Issue(3)：560-571,12.DOI:10.7685/jnau.202407032
基于DNDC模型模拟长期绿肥轮作对盐渍土有机碳和玉米产量的影响
Effects of long-term green manure rotations on soil organic carbon and maize yield in coastal saline soil areas based on DNDC model
摘要
Abstract
[Objectives]This study used the DNDC(denitrification and decomposition)model to explore the effects of long-term green manure rotation on soil organic carbon and maize yield under future climate change scenarios.[Methods]Based on field test data from 2022 to 2023,this study evaluated different green manures and different return methods:bare field without green manure-maize(CK),ryegrass full over returning to field-maize(RF),ryegrass mulching-maize(RM),alfalfa full over returning to field-maize(AF)and alfalfa mulching-maize(AM)based on three future climate change scenarios(SSP1-2.6,SSP2-4.5,SSP5-8.5)of the DNDC model and the BCC-CSM2-MR climate model.The future trends of summer maize yield and soil organic carbon(SOC)storage were evaluated under five treatments.[Results]The DNDC model accurately simulated summer maize yield and SOC storage.The nRMSE between the simulated and measured values of maize yield was 12.08%.The R2 of SOC at the 0-50 cm depth ranged from 0.703 to 0.917,d ranged from 0.905 to 0.968,and nRMSE ranged from 12.151%to 23.878%.Sensitivity analysis showed that both maize yield and SOC were most sensitive to the atmospheric CO2 concentration.In the future,from 2025 to 2100,the summer maize yield of RF and RM treatments was not significantly different from that of CK treatment.The summer maize yield of AF and AM treatments increased significantly by 9.70%-39.30%compared with CK treatment.Green manure returned to the field increased SOC sequestration.The annual soil carbon sequestration in 0-50 cm soil was 127.63-333.52 kg·hm-2,with the AF treatment exhibiting the greatest SOC enhancement.[Conclusions]The DNDC model simulations revealed that under three distinct future climate scenarios,alfalfa full over returning to field-maize treatment showed the most pronounced synergistic enhancement of both soil carbon sequestration capacity and summer maize productivity.关键词
绿肥轮作/盐渍土/DNDC模型/土壤有机碳/气候变化Key words
green manure rotation/coastal saline soil/DNDC model/soil organic carbon/climate change分类
农业科学引用本文复制引用
李印娟,赵维亮,贾旭霞,朱豪杰,罗纨,王同顺..基于DNDC模型模拟长期绿肥轮作对盐渍土有机碳和玉米产量的影响[J].南京农业大学学报,2025,48(3):560-571,12.基金项目
江苏省自然科学基金项目(BK20220564) （BK20220564）
国家自然科学基金项目(32301435) （32301435）
