| 三峡澎溪河水华期间水体CH4浓度及其通量变化特征初探 |
| 摘要点击 3712 全文点击 1151 投稿时间：2017-06-06 修订日期：2017-10-17 |
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| 中文关键词 三峡水库 澎溪河 水华 氮磷 CH4 |
| 英文关键词 Three Gorges Reservoir Pengxi River algal bloom nitrogen and phosphorus CH4 |
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| 中文摘要 |
| 三峡库区温室气体的排放近年来备受关注.为了揭示三峡库区澎溪河地区水华过程中不同氮磷浓度下藻类生长死亡过程中CH4吸收释放的规律，于2016年4月22日至2016年5月9日，通过添加不同氮磷浓度在澎溪河高阳平湖水域展开野外原位实验.结果表明，在开始实验当日CH4通量从（1.8093±0.0632）μmol·（m2·h）-1到6 d急剧减少至（0.0776±0.0146）μmol·（m2·h）-1.6 d后变化相对较小，相比较于其他水样只添加磷的水样明显有所回升.在本次实验中藻类的生长与死亡受到了不同N、P浓度梯度的影响.N对藻类的生长影响不大，各种指标与未加N、P营养盐的原水基本一致；在适宜的P浓度下，促进藻类的生长.当P浓度过多时，藻类的生长受到抑制.水样中的CH4通量的吸收与释放和添加的硝态氮有关. |
| 英文摘要 |
| Emissions of greenhouse gases in the Three Gorges Reservoir have been attracting attention in the recent years. This study was conducted to reveal the CH4 emission and removal during the process of algal growth at different nitrogen and phosphorus concentrations in the Pengxi River in the Three Gorges Reservoir. In-situ field experiments were conducted in the Gaoyang Lake in Pengxi River. From April 22nd, 2016, to May 9th, 2016, different concentrations of nitrogen and phosphorus were added to different experimental chambers. Results showed that CH4 emission decreased sharply from the first day of the experiment to the sixth day, and after that, CH4 emission in the water samples with only added phosphorus were obviously recovered compared to the other treatment. In this experiment, algal biomass was influenced by different concentrations of N and P. The biomass of algae were not affected by N, but were promoted under suitable concentration of P, such as 1P, 10P, 1NP, and 10NP. When the P concentration was too high, the biomass of algae was also limited. The emission and removal of CH4 in the experiment were significantly related to the addition of NO3--N. |
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