湖泊科学Issue(3)：696-704,9.DOI:10.18307/2017.0319
蓄水初期三峡水库草堂河水-气界面CO2和CH4通量日变化特征及其影响因素
Diurnal variation and influencing factors of carbon dioxide and methane emissions at wa-ter-air interface of Caotang River, Three Gorges Reservoir in the initial impoundment pe-riod
摘要
Abstract
With the LGR-floating chamber method, a 24-hour continuous monitoring was carried out in the initial impoundment period of Three Gorges Reservoir, in order to understand the greenhouse gases fluxes ( carbon dioxide and methane) across the wa-ter-air interface of Caotang River which is the primary tributary of the reservoir. The results indicated that the fluxes of carbon diox-ide and methane across the water-air interface appeared an obvious characteristic of diurnal variation. The fluxes of carbon dioxide ranged from-81.642 to 180.991 mg/( m2 ·h) , and the average fluxes of carbon dioxide were 17.346 mg/( m2 ·h) . As a result, the overall carbon dioxide showed"absorb by day and emit at night". Methane was emitted all day with the average fluxes of meth-ane 0.064 mg/( m2 ·h) showed"strong at day and weak at night". The fluxes of carbon dioxide and methane had a positive corre-lation with wind speed while a negative correlation was observed with water temperature of surface layer, dissolve oxygen and chlo-rophyll-a. It could be explain the most important factors that influence emissions at water-air interface were phytoplankton photosyn-thesis and bacterial metabolism process in the surface water. The changes in greenhouse gases emissions at water-air interface were also relevant to special environment (density current and thermal stratification) due to the interaction between main current and tributaries. The hydrodynamic factors were the key factors that affect carbon cycle and the greenhouse gases fluxes across the water-air interface in backwaters of tributaries, which would be worth researching.关键词
三峡水库/草堂河/水-气界面/温室气体通量/连续原位观测/环境因素Key words
Three Gorges Reservoir/Caotang River/water-air interface/greenhouse gases flux/continuous monitoring/environ-mental factors引用本文复制引用
汪国骏,胡明明,王雨春,袁浩,蒋蓉,王启文,叶振亚,梁顺田..蓄水初期三峡水库草堂河水-气界面CO2和CH4通量日变化特征及其影响因素[J].湖泊科学,2017,(3):696-704,9.基金项目
国家自然科学基金项目(51309252,51679258)、国家水体污染控制与治理重大专项(2012ZX07104-001)、三峡水库温室气体源汇监测与分析研究和三峡工程生态与环境监测系统重点站项目联合资助. （51309252,51679258）
