基于涡度相关技术的农田生态系统碳收支评估  

Evaluation of carbon budget for farmland ecosystem based on the eddy correlation technology

作　　者：赵辉 朱盛强[1] 刘贞 邓蕙菁 郑有飞 ZHAO Hui;ZHU Shengqiang;LIU Zhen;DENG Huijing;ZHENG Youfei(Department of Environmental Science and Engineering,Fudan University,Shanghai 200438;Guangdong Key Laboratory of Environmental Protection and Resources Utilization,Guangzhou 510640;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET),Nanjing University of Information Science&Technology,Nanjing 210044;Qinhuangdao Meteorological Bureau,Qinhuangdao 066000)

机构地区：[1]复旦大学环境科学与工程系,上海200438 [2]广东省环境资源利用与保护重点实验室,广州510640 [3]南京信息工程大学江苏省大气环境与装备技术协同创新中心,南京210044 [4]秦皇岛市气象局,秦皇岛066000

出　　处：《环境科学学报》2021年第11期4731-4739,共9页Acta Scientiae Circumstantiae

基　　金：中国博士后科学基金(No.2020M681157);广东省省级科技计划项目(No.2020B1212060053);江苏省大气环境监测与污染控制高技术研究重点实验室开放基金项目(No.KHK2003);河北省气象局青年基金(No.20ky32)。

摘　　要：以涡度相关技术为主要观测手段,连续观测冬小麦和水稻生态系统主要生长季净生态系统CO_(2)交换(NEE)的变化规律,评估两种农田生态系统CO_(2)的源/汇功能.结果表明,整个观测期间,两种作物生态系统CO_(2)浓度的日变化曲线呈现白天低、晚上高的“一峰一谷”型,冬小麦生态系统变化较为平缓,而水稻生态系统变化则比较剧烈.冬小麦和水稻生态系统白天30 minCO_(2)通量的平均值分别为-13.4μmol·m^(-2)·s^(-1)和-12.9μmol·m^(-2)·s^(-1),通量最高值分别出现冬小麦的孕穗期与水稻的开花期.此外,两种作物生长季CO_(2)通量表现出“U”形曲线的日变化特点,白天以吸收CO_(2)为主,冬小麦和水稻生态系统分别于12:00和11:30达到吸收峰值;夜间CO_(2)通量变化较为稳定,表现为呼吸排放CO_(2).两种农田生态系统均表现为碳汇,冬小麦与水稻生态系统净碳交换分别为188.2g·m^(-2)与233.8g·m^(-2).This study used eddy correlation technology to continuously observe the changes of net ecosystem CO_(2)exchange(NEE)during the main growing seasons of winter wheat and rice ecosystems,and evaluated the CO_(2)source/sink functions of the two farmland ecosystems.The results showed that:During the whole observation period,the diurnal variation curves of CO_(2)concentration for the two crops showed typical one⁃peak⁃one valley pattern,which was low during the day and high during the night.The diurnal variation curves of CO_(2)concentration for winter wheat was relatively flat,while that of rice is more severe.The mean values of 30⁃minute CO_(2)fluxes during the daytime for winter wheat and rice were-13.4μmol·m^(-2)·s^(-1)and-12.9μmol·m^(-2)·s^(-1),respectively.The highest fluxes occurred at the booting stage of winter wheat and the flowering stage of rice.In addition,CO_(2)fluxes of the two crops during the growing season showed a diurnal variation characteristic of a U⁃shaped curve.Two farmland ecosystems mainly absorbed CO_(2)during the daytime,and the absorption peaks of winter wheat and rice appeared at 12:00 and 11:30,respectively.The CO_(2)flux changes during the night were relatively stable,which manifested as the emissions of CO_(2)respiratory.Two farmland ecosystems were carbon sinks,and the net ecosystem carbon exchange were 188.2 g·m^(-2)for winter wheat and 233.8 g·m^(-2)for rice.

关 键 词：涡度相关法 CO_(2)通量 冬小麦 水稻 净生态系统碳交换 

分 类 号：X171[环境科学与工程—环境科学]