DNDC模拟氮形态对盐渍化草地CO2排放的影响及敏感性
打开文本图片集
中图分类号：S812 文献标识码：A 文章编号：1007-0435（2025）09-2912-09
doi：10.11733/j.issn.1007-0435.2025.09.016
Effects of Nitrogen Speciation Simulated by DNDC on CO2 Emissions and Sensitivity in a Salinized Grassland
LI Jiao-jao1，LIGuang2，WU Jiang-qi²，XU Guo-rong²，YAO Yao²， WANG Shuai-jun²，WANG Yu-yuan （1.ColegeofInformationScienceandTechnology，GansuAgriculture University，Lanzhou，GansuProvince73oo7o，China; 2.College ofagronomy，Gansu Agriculture University，Lanzhou，Gansu Province 73oo7o，China）
Abstract：Based on the DNDC（Denitrification-Decomposition Model）model and incorporated continuous monitoring data，such as CO2 flux，from the experimental area，the study investigated the effects of different nitrogen forms on CO2 emissions from saline-alkali grasslands in the Hexi Corridor，and evaluated the sensitivity of CO2 emissions to climate change，soil properties，and management practices.The results showed that，compared tono nitrogen adition（CK），the application of diffrent nitrogen sources（organic nitrogen，ON；inorganic nitrogen，IN；mixed fertilization，MN） significantly increased soil CO2 emissions by 24.27% to 71. 03% （204号 during the growing season. Furthermore，model evaluation results indicated that the NRMSE（Normalized Root Mean Square Error）valuesranged from O.117 to O.22l，and the R2 values ranged from O.605 to 0.906， suggesting that the DNDC model could effectively simulate the impact of different nitrogen inputs on CO2 emissions.Sensitivity analysis revealed that the annual average temperature Was the most critical factor influencing CO2 emissions. Based on climate scenario projections for the next 50 years （2O24—2073），compared to CK， different nitrogen inputs were expected to increase CO2 emissions by 18.73% to 54.37% . This study provides important references for the local improvementand applicabilityverificationof the DNDC model，ofering theo retical support for reducing greenhouse gas emissions from saline-alkali grasslands in the Hexi Corridor under the context of global climate change.
Key words： CO2 emissions;DNDC model;Different nitrogen input forms;Sensitivity analysis
20世纪是自有气象记录以来最暖的百年之一，1998年全球气温达到世纪最高点，并且随着时间推移，全球变暖的速度不断加快。（剩余13526字）
