赵辉,朱盛强,刘贞,邓蕙菁,郑有飞.基于涡度相关技术的农田生态系统碳收支评估[J].环境科学学报,2021,41(11):4731-4739
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
- 基金项目：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）
- 赵辉
- 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
- 朱盛强
- 复旦大学环境科学与工程系, 上海 200438
- 邓蕙菁
- 复旦大学环境科学与工程系, 上海 200438
- 郑有飞
- 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
- 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CO2交换（NEE）的变化规律，评估两种农田生态系统CO2的源/汇功能.结果表明，整个观测期间，两种作物生态系统CO2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 min CO2通量的平均值分别为-13.4 μmol·m-2·s-1和-12.9 μmol·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CO2通量表现出"U"形曲线的日变化特点，白天以吸收CO2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CO2通量变化较为稳定，表现为呼吸排放CO2.两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188.2 g·m-2与233.8 g·m-2.
- Abstract：This study used eddy correlation technology to continuously observe the changes of net ecosystem CO2 exchange (NEE) during the main growing seasons of winter wheat and rice ecosystems, and evaluated the CO2 source/sink functions of the two farmland ecosystems. The results showed that:During the whole observation period, the diurnal variation curves of CO2 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 CO2 concentration for winter wheat was relatively flat, while that of rice is more severe. The mean values of 30-minute CO2 fluxes during the daytime for winter wheat and rice were -13.4 μmol·m-2·s-1 and -12.9 μmol·m-2·s-1, respectively. The highest fluxes occurred at the booting stage of winter wheat and the flowering stage of rice. In addition, CO2 fluxes of the two crops during the growing season showed a diurnal variation characteristic of a U-shaped curve. Two farmland ecosystems mainly absorbed CO2 during the daytime, and the absorption peaks of winter wheat and rice appeared at 12:00 and 11:30, respectively. The CO2 flux changes during the night were relatively stable, which manifested as the emissions of CO2 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.
