| 太湖藻型湖区CH4、CO2排放特征及其影响因素分析 |
| 摘要点击 2001 全文点击 746 投稿时间：2017-08-15 修订日期：2017-11-10 |
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| 中文关键词 太湖藻型湖区 静态箱法 温室气体 通量 排放特征 影响因素 |
| 英文关键词 algal lake zone of Lake Taihu closed chamber greenhouse gases flux emission characteristics influencing factors |
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| 中文摘要 |
| 为明确太湖藻型湖区温室气体CH4、CO2排放特征及其影响因素，本研究利用便携式温室气体分析仪改进的静态箱法，对太湖梅梁湾春、夏季的CH4、CO2通量进行观测，并分析其影响要素.主要结果为：观测地点春、夏季CH4、CO2通量具有明显日变化动态.春季，CH4通量白天大于夜间，夏季夜间大于白天；春、夏季，CO2吸收通量均白天大于夜间.梅梁湾藻型湖区春、夏季为CH4源，且CH4释放通量在夏季明显高于春季，春、夏季的平均通量分别为4.047 nmol·（m2·s）-1和40.779 nmol·（m2·s）-1；该区域春、夏季为CO2汇，且春季CO2吸收大于夏季，春、夏季的平均通量分别为-0.160 μmol·（m2·s）-1和-0.033 μmol·（m2·s）-1.在小时尺度上，CH4释放通量与气温和水温呈显著正相关（r=0.20，P<0.01；r=0.34，P<0.01），当风速<6 m·s-1时，与风速呈显著正相关（r=0.71，P<0.01）；CO2吸收通量与气温和风速呈显著正相关（r=0.14，P<0.01；r=0.33，P<0.05），与气压和太阳辐射呈显著负相关（r=-0.41，P<0.01；r=-0.35，P<0.01）；CO2释放通量与风速呈显著正相关（r=0.40，P<0.05），与太阳辐射呈显著负相关（r=-0.35，P<0.01）.在日尺度上，CH4释放通量与水温和气温呈显著正相关（r=0.83，P<0.01；r=0.78，P<0.01）. |
| 英文摘要 |
| In order to identify CH4 and CO2 emission flux characteristics and their impact factors in the algal lake zone of Lake Taihu, CH4 and CO2 fluxes were observed by the improved closed chamber method in Meiliang Bay in Lake Taihu. The relationships between CH4 and CO2 flux and meteorological factors were analyzed. The results showed that CH4 and CO2 fluxes had obvious diurnal variations. The CH4 flux in the daytime was higher than that in the nighttime in spring; however, the CH4 flux in the nighttime was higher than that in the daytime in summer. The CO2 uptake flux in the daytime was higher than that in the nighttime in spring and summer. The algae zone of Lake Taihu was a CH4 source for the atmosphere. The average CH4 flux was 4.047 nmol ·(m2 ·s)-1 and 40.779 nmol ·(m2 ·s)-1 in spring and summer, respectively. The zone was the CO2 sink for the atmosphere in spring and summer. The average CO2 flux was -0.160 μmol ·(m2 ·s)-1 and -0.033 μmol ·(m2 ·s)-1 in spring and summer, respectively. On an hourly scale, the CH4 emission flux was positively correlated with air temperature and water temperature (r=0.20, P<0.01 and r=0.34, P<0.01, respectively). When wind speed was lower than 6 m ·s-1, the CH4 flux was positively correlated with wind speed (r=0.71, P<0.01). The CO2 uptake flux had a significant positive correlation with air temperature and wind speed (r=0.14, P<0.01 and r=0.33, P<0.05, respectively). However, the CO2 uptake flux was negatively correlated with air pressure and solar radiation (r=-0.41, P<0.01 and r=-0.35, P<0.01, respectively). The CO2 efflux had a significant positive correlation with wind speed (r=0.40, P<0.05). The CO2 efflux was negatively correlated with solar radiation (r=-0.35, P<0.01). On a daily scale, the CH4 emission flux had a significant positive correlation with air temperature and water temperature (r=0.83, P<0.01 and r=0.78, P<0.01, respectively). |
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