太湖藻型湖区CH4冒泡通量  

The methane ebullition flux over algae zone of Lake Taihu

作　　者：蒲旖旎 贾磊 杨诗俊 秦志昊 苏荣明珠 赵佳玉[1] 张弥[1] PU Yi-ni;JIA Lei;YANG Shi-jun;QIN Zhi-hao;SU Rong-ming-zhu;ZHAO Jia-yu;ZHANG Mi(Yale-NUIST Center on Atmospheric Environment,International Joint Laboratory on Climate and Environment Change,Jiangsu Key Lab of Agricultural Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气候与环境变化国际合作联合实验室大气环境中心,江苏省农业气象重点实验室,江苏南京210044

出　　处：《中国环境科学》2018年第10期3914-3924,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(41575147)

摘　　要：冒泡是甲烷排放的主要途径之一,为量化太湖藻型湖区CH_4冒泡通量及其占总通量的比例,本研究采用静态箱—便携式温室气体自动分析仪方法对春、夏季太湖梅梁湾进行了多日连续观测.结果表明,太湖藻型湖区春、夏季CH_4冒泡通量均存在白天高于夜间的日变化特征.春、夏季CH_4冒泡通量分别为1.843、104.497nmol/(m^2·s),占总通量的比例分别为31.2%和68.6%,即冒泡是夏季CH_4排放的主要方式,而春季CH_4排放则以扩散为主.在小时及日尺度上,CH_4冒泡通量与温度(气温、表面水温和底泥温度)和气压显著相关,且随着温度升高、气压降低,CH_4冒泡排放分别呈指数增加和线性增加趋势.本研究可为准确估算太湖流域CH_4总排放量及明确我国湖泊对全球碳循环的贡献提供重要的基础数据.Ebullition is one of the main pathways for CH4 emission.To quantify CH4 ebullition flux and its ratio to total CH4 emission flux over algae zone of Lake Taihu,floating chamber method was utilized in this study in the Meiliang Bay of Lake Taihu during spring and summer time.The results showed that daytime CH4 ebullition flux was obviously higher than that of nighttime in both spring and summer seasons.The mean CH4 ebullition flux and its ratio to total CH4 flux in spring were 1.843nmol/(m2·s)and 31.2%respectively and that in summer were 104.497nmol/(m2·s)and 68.6%.The results indicated that the dominant CH4 emission pathway was diffusion in spring and different from spring,ebullition played important role in summer.Temperature(air temperature,surface water temperature,and sediment temperature)and air pressure were significantly correlated to CH4 ebullition emission at hourly and daily scale.The CH4 ebullition emission increased exponentially with increasing temperature and increased linearly as air pressure decreased.This study can provide important basic data for accurately estimating total CH4 emission in Lake Taihu basin and clarifying the contribution of CH4 emission from lakes in China to the global carbon cycle.

关 键 词：太湖藻型湖区 箱式法 甲烷通量 冒泡通量 冒泡通量比例 气象因子 

分 类 号：X511[环境科学与工程—环境工程]