| 卫河新乡市区段春季溶解CH4与N2O浓度特征 |
| 摘要点击 4250 全文点击 1656 投稿时间：2015-09-15 修订日期：2015-12-15 |
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| 中文关键词 卫河 CH4 N2O 城市 环境因子 |
| 英文关键词 Weihe River CH4 N2O urban environmental factors |
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| 中文摘要 |
| 对卫河新乡市区段春季CH4与N2O浓度进行调查分析,初步探讨了城市河流中典型温室气体的溶存量空间变化及其影响因素.结果表明,受到水中污染物质浓度及人类活动影响,春季卫河表层水中CH4与N2O浓度处于超饱和状态,饱和度分别为147.59~2667.85和4.06~188.25.影响市区内N2O浓度的主要环境因素为NH4+-N(P<0.01),而新区污水处理厂排水输入显著提高了N2O的溶存量,说明污染物类型影响温室气体的产生和积累,NH4+-N的硝化过程是城市河流N2O产生的主要来源.逐步回归分析表明CH4浓度是NH4+-N浓度与水温的相关函数,其中CH4浓度与NH4+-N极显著相关(R2=0.70,P<0.01),说明春季卫河中NH4+-N浓度是影响卫河春季CH4溶存的关键因素.此外研究结果显示在NO3--N浓度较低并且NH4+-N浓度高时水中CH4与N2O浓度具有显著正相关关系,表明有效态氮浓度差异影响CH4与N2O产生过程的耦合机制. |
| 英文摘要 |
| Distributions of CH4 and N2O concentrations in Weihe River in Xinxiang City were monitored in spring of 2015, and their influencing factors were discussed. The result showed that CH4 and N2O were super-saturated in surface water of Weihe River. The variation ranges of two gases'saturations in the surface water of Weihe River were 147.59-2667.85 (CH4) and 4.06-188.25 (N2O). In the urban area, significant correlation existed between N2O and NH4+-N concentrations (P<0.01), but in the new district, dissolved N2O concentration showed sharp increase because of the water input from the urban sewage plants, illustrating that the controlling mechanism on N2O production varied as pollutant characteristics changed. Stepwise regression analysis showed that CH4 concentrations could be explained by NH4+-N concentrations and water temperature, and CH4 concentrations in the surface water of Weihe River was significantly correlated with NH4+-N concentrations (R2=0.70, P<0.01), suggesting that NH4+-N was the key factor in regulating the production and assumption of CH4 oxidation in Weihe River in spring. Besides, this study showed that when there was less NO3--N but more NH4+-N in river water, CH4 and N2O concentrations would be positively correlated, indicating that different nitrogen sources would impact the coupling mechanism of CH4 and N2O productions. |
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