草地学报 ›› 2025, Vol. 33 ›› Issue (9): 2912-2920.DOI: 10.11733/j.issn.1007-0435.2025.09.016

• 研究论文 • 上一篇    下一篇

DNDC模拟氮形态对盐渍化草地CO2排放的影响及敏感性

李姣姣1, 李广2, 吴江琪2, 徐国荣2, 姚瑶2, 王帅钧2, 王雨媛2   

  1. 1. 甘肃农业大学信息科学技术学院, 甘肃 兰州 730070;
    2. 甘肃农业大学林学院, 甘肃 兰州 730070
  • 收稿日期:2024-09-16 修回日期:2025-04-16 出版日期:2025-09-15 发布日期:2025-09-22
  • 通讯作者: 李广,E-mail:lig93272883@163.com
  • 作者简介:李姣姣(1997-),女,汉族,陕西西安人,硕士研究生,主要从事农业软件工程研究,E-mail:1149572686@qq.com
  • 基金资助:
    国家自然科学基金青年基金项目(42307348);兰州市青年科技人才创新项目(2023-QN-163);甘肃农业大学伏羲青年人才项目(Gaufx-05Y05);甘肃省拔尖领军人才培育项目(GSBJLJ-2023-09);甘肃省青年博士支持项目[2025QB-043]资助

Effects of Nitrogen Speciation Simulated by DNDC on CO2 Emissions and Sensitivity in a Salinized Grassland

LI Jiao-jiao1, LI Guang2, WU Jiang-qi2, XU Guo-rong2, YAO Yao2, WANG Shuai-jun2, WANG Yu-yuan2   

  1. 1. College of Information Science and Technology, Gansu Agriculture University, Lanzhou, Gansu Province 730070, China;
    2. College ofagronomy, Gansu Agriculture University, Lanzhou, Gansu Province 730070, China
  • Received:2024-09-16 Revised:2025-04-16 Online:2025-09-15 Published:2025-09-22

摘要: 本研究以河西盐渍化草地为研究对象,基于反硝化-分解模型 (Denitrification-Decomposition Model,DNDC),结合试验区连续监测数据CO2排放通量等数据,探讨了不同形态氮输入对盐渍化草地CO2排放的影响,并评估了气候变化、土壤特性和管理措施对CO2排放的敏感性。研究结果表明,相较于不添加氮肥(CK),不同氮源(有机氮ON、无机氮IN、混合施肥MN)添加显著增加了土壤CO2排放量,且生长季CO2排放量增加了24.27%~71.03%。此外,模型评估结果显示,归一化均方根误差值在0.117~0.221之间,R2值介于0.605~0.906之间,表明DNDC模型能够有效模拟不同氮源输入对CO2排放的影响。敏感性分析表明,年平均温度是影响CO2排放的最关键因素。而基于未来50年(2024—2073年)的气候情景模型预测表明,相较于CK,不同形态氮输入将使得CO2排放量增加18.73%~54.37%。该研究为DNDC模型的局部改良及适用性验证提供了重要参考,并为在全球气候变化背景下,河西走廊盐渍化草地减少温室气体排放提供理论支持。

关键词: CO2排放, DNDC模型, 不同形态氮输入, 敏感性分析

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 to no nitrogen addition (CK), the application of different nitrogen sources (organic nitrogen, ON; inorganic nitrogen, IN; mixed fertilization, MN) significantly increased soil CO2 emissions by 24.27% to 71.03% during the growing season. Furthermore, model evaluation results indicated that the NRMSE (Normalized Root Mean Square Error) values ranged from 0.117 to 0.221, and the R2 values ranged from 0.605 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 (2024—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 improvement and applicability verification of the DNDC model, offering theoretical 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

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