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中国农学通报

中国农学通报 ›› 2023, Vol. 39 ›› Issue (11): 74-79.doi: 10.11924/j.issn.1000-6850.casb2022-0628

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

节水灌溉与生物炭施用对稻田生态系统CO2净通量日变化的影响

李伟征1(), 陈娟2, 江赜伟1, 杨士红1()   

  1. 1 河海大学农业科学与工程学院，南京 210098
    2 临沂市湿地保护中心，山东临沂 276000
  • 收稿日期:2022-07-23 修回日期:2022-10-05 出版日期:2023-04-15 发布日期:2023-04-10
  • 通讯作者: 杨士红，男，1983年出生，山东临沂人，博士生导师，教授，主要从事节水灌溉与农田生态效应研究。通信地址：211100 江苏省南京市江宁区佛城西路8号 河海大学，E-mail：ysh7731@hhu.edu.cn。
  • 作者简介:

    李伟征，男，1997年出生，山西忻州人，硕士，主要从事节水灌溉理论研究。通信地址：211100 江苏省南京市江宁区佛城西路8号 河海大学，E-mail：。

  • 基金资助:
    国家自然科学基金项目“生物炭对节水灌溉稻田氮素迁移转化及损失的影响机理与调控研究”(51879076); 中央高校业务费项目“节水灌溉稻田磷素吸附解析及淋溶损失对生物炭施用的响应”(B210204016); “不同水碳管理下太湖流域稻田温室气体排放及应对气候变化策略”(B220203009)

Effects of Water-saving Irrigation and Biochar Application on the Diurnal Variation of Net CO2 Flux in Paddy Field Ecosystem

LI Weizheng1(), CHEN Juan2, JIANG Zewei1, YANG Shihong1()   

  1. 1 College of Agricultural Science and Engineering, Hohai University, Nanjing 210098
    2 Linyi Wetland Protection Center, Linyi, Shandong 276000
  • Received:2022-07-23 Revised:2022-10-05 Online:2023-04-15 Published:2023-04-10

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摘要：

为了揭示不同水碳管理对稻田生态系统-大气间CO2交换的影响，基于田间试验，分析了不同水碳管理模式下稻田生态系统CO2净通量日变化特征。结果表明：分蘖期、拔节孕穗期、乳熟期稻田生态系统CO2净通量变化趋势均呈现U型特征，总体表现为白天吸收，夜晚排放，且各生育期的净吸收阶段与净排放阶段在时间上呈现一致性。随着生育期的推进，稻田生态系统白天CO2净吸收时长及吸收量呈现先升高后降低趋势。除分蘖期高量生物炭处理降低了稻田生态系统白天CO2净吸收通量外，生物炭施用增大了节水灌溉稻田生态系统白天CO2净吸收通量与夜晚CO2净排放通量。与不施用生物炭处理相比，2种生物炭情况下稻田生态系统白天与夜间CO2净通量增加幅度为2.26%~27.16%和2.30%~32.69%。节水灌溉减小了稻田生态系统白天CO2净吸收通量，增大了稻田生态系统夜间CO2净排放通量，白天吸收和夜晚排放的变化幅度为2.68%~59.79%和1.26%~40.95%。研究结果可为实现稻田水资源高效利用及充分发挥稻田生态系统的碳汇功能提供理论依据。

关键词: 生物炭, 节水灌溉, 稻田生态系统, CO2净通量, 日变化

Abstract:

To reveal the effects of different water and carbon management on CO2 exchange between paddy ecosystem and atmosphere, based on field experiments, the diurnal variation characteristics of net CO2 flux in paddy field ecosystem under different water and carbon management modes were analyzed. The results showed that the change trend of net CO2 flux in paddy field ecosystem at tillering stage, jointing and booting stage and milky stage was U-shaped, which showed that it was generally absorbed during the day and discharged at night, and the net absorption stage and net emission stage in each growth period were consistent in time. With the advance of growth period, the net CO2 absorption duration and amount in daytime of paddy field ecosystem presented the trend of increasing at first and then decreasing. In addition to the treatment of high amount of biochar at tillering stage, which reduced the net CO2 absorption flux in the paddy field ecosystem during the day, the application of biochar increased the net CO2 absorption flux during the day and the net CO2 emission flux in the night of the water-saving irrigation paddy field ecosystem. Compared with the treatment without biochar, the net CO2 flux of paddy field ecosystem during the day and at night were increased by 2.26%-27.16% and 2.30%-32.69% under the two biochar conditions. Water-saving irrigation reduced the net absorption flux of CO2 in paddy field ecosystem during the day, but increased the net emission flux of CO2 in paddy field ecosystem at night. The variation ranges of daytime absorption and night emission were 2.68%-59.79% and 1.26%-40.95%. The research results could provide a theoretical basis for realizing the efficient utilization of paddy field water resources and giving full play to the carbon sink function of paddy field ecosystem.

Key words: biochar, water saving irrigation, paddy ecosystem, net CO2 flux, diurnal variation