摘要
以昆玉河为例,采用LGR-动态通量箱法,对城市河流夏季水-气界面CO2释放通量进行24h连续监测.结果表明,观测点处水-气界面CO2释放通量具有明显的日变化特征.24h内CO2释放通量在-27.18～12.51mg.m-2.h-1,平均值-7.28mg.m-2.h-1,昼间平均值为-8.81mg.m-2.h-1,夜间平均值为-4.22mg.m-2.h-1.24h内水-气界面CO2通量,极大值出现在21:20为12.51mg.m-2.h-1,极小值出现在6:20为-27.18mg.m-2.h-1.在夏季城市河流水-气界面CO2通量受到气温、风速、总磷(TP)、总氮(TN)、总碱度(TA)等因素影响,使城市河流成为大气CO2的碳"汇"之一.
In order to study the greenhouse gases daily emission characteristics of the urban rivers in summer, we take the Kunyu River for example and use the LGR-airtight floating dynamic flux chamber method to ac- complish a 24 h continuous monitoring of CO2 flux across water-air interface. It is indicated that the CO2 flux across water-air interface appears an obvious diurnal variation characteristics. The Kunyu River predominant- ly absorbs CO2 from atmosphere within 24 h, while sometimes it emits CO2 from water into air. The range of CO2 emission flux is --27.18--12.51 mg · m-2·h-1. The 24 h average, diurnal average and nocturnal average of COz fluxes are --7.28 mg·m-2·h-1, --8.81 mg·m-2· h-1 and --4.22 mg·m-2·h-1 , respectively. The maximum 12.51 mg·m-2·h 1 appears at 21：20 while the minimum --27.18 mg·m-2·h-a ap- pears at 6 ： 20. In the summer, the COz flux across water-air interfaee in the urban river is influenced by tem- perature, wind speed, TP, TN, TA and other factors, so as to make the urban river becomes a carbon ＂sink＂ of CO2.
出处
《三峡大学学报（自然科学版）》
CAS
2013年第2期1-5,共5页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金(51179205)
中国工程院院士科技咨询项目(电0205012011)
