水稻生长季CO_(2)通量的时间动态和影响因子研究  

Temporal Dynamics and Influencing Factors of CO_(2)Fluxes During Rice Growing Season

作　　者：张丽君 胡凝[1] 刘珊珊 徐敏 王伟[1] 邰久 葛培 ZHANG Lijun;HU Ning;LIU Shanshan;XU Min;WANG Wei;TAI Jiu;GE Pei(Jiangsu Key Laboratory of Agricultural Meteorology,Key Laboratory of Ecosystem Carbon Source and Sink,China Meteorological Administration(ECSS-CMA),Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Nanjing University of Information Science&Technology,Nanjing 210044,China;Climate Center of Jiangsu Province,Nanjing 210019,China;Hengshui Municipal Meteorological Bureau,Hengshui 053000,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室,气象灾害预报预警与评估协同创新中心,中国气象局生态系统碳源汇重点开放实验室,江苏省农业气象重点实验室,江苏南京210044 [2]江苏省气候中心,江苏南京210019 [3]衡水市气象局,河北衡水053000

出　　处：《环境科学与技术》2024年第3期27-36,共10页Environmental Science & Technology

基　　金：江苏省“333人才”领军型人才团队(BRA2022023);江苏省气象局揭榜挂帅科研项目(KZ202302);江苏省农业气象重点实验室开放基金(JKLAM2305)。

摘　　要：为了明确长三角地区稻麦轮作生态系统中水稻生长季CO_(2)通量的多时间尺度变化特征,量化环境因子对农田CO_(2)通量变化的贡献度,拆分环境因子的直接影响和间接影响,该研究利用涡度相关观测系统进行了2年CO_(2)通量的连续观测,分析了辐射类、温度类、水汽类和风速对CO_(2)通量的影响。结果表明:稻麦轮作生态系统在水稻生长季是一个二氧化碳汇,2020、2021年水稻生长季的总固碳量分别为396.3、491.9 g/m^(2)(以C计);CO_(2)通量也有明显的日变化,呈现出“U形”和“V型”的单峰曲线,吸收峰值出现在第200~250天。在不同时间尺度上,影响CO_(2)通量的主控因子始终是光合有效辐射;但随时间尺度的增加,各个因子贡献度的差异逐渐减小。饱和水汽压差也是影响CO_(2)通量的重要因子,它与光合有效辐射的交互作用会抑制彼此对CO_(2)通量的直接贡献。This study conducted continuous 2-years observation of CO_(2)fluxes by using eddy covariance method and ana⁃lyzed the influences of radiation,temperature,water vapor,and wind speed on CO_(2)fluxes,in order to clarify the multi-tempo⁃ral variation characteristics of CO_(2)flux during rice growing season in a wheat-rice rotation ecosystem in the Yangtze River Delta region,quantify the contribution of environmental factors to the variation of CO_(2)flux during rice growing season,and split the direct and indirect impacts of environmental factors on CO_(2)flux.The results showed that this ecosystem during the rice growing season was a carbon sink,with total carbon sequestration of 396.3 g/m^(2)and 491.9 g/m^(2)during the rice growing seasons in 2020 and 2021 respectively.The CO_(2)flux also exhibited significant diurnal variations,with a single peak curve of“U”and“V”shape,and its absorption peaks were located from 200th to 250th day of year.At different time-scale,photosynthetic photon flux density(PPFD)remained the main control factor of CO_(2)flux.As the time scale was longer,the difference between the contributions of environmental factors was reduced.Vapor pressure deficit(VPD)was also an important factor on CO_(2)flux,but the interaction between PPFD and VPD would inhibit the direct contribution of these two factors on CO_(2)flux.

关 键 词：稻麦轮作生态系统 CO_(2)通量 贡献度 交互作用 涡度相关 

分 类 号：X16[环境科学与工程—环境科学]