中文关键词营养盐常量离子补给量贡献率来源估算 英文关键词nutrientsinorganic ionssupply amountcontribution ratiosources estimate

作者	单位	E-mail
徐雅倩	湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068	artryxu@163.com
徐飘	湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068
杨正健	湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068	656637841@qq.com
刘德富	湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068
马骏	湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068

中文摘要 河道型水库支流库湾营养盐季节变化直接决定支流藻类群落结构的演替及初级生产力变化过程.为分析三峡水库支流香溪河库湾主要营养盐来源对营养盐季节性变化的影响，基于2010~2011年香溪河库湾野外监测数据，选取干、支流差异显著（P<0.01）的常量离子Cl^-和Na⁺作为水团混合示踪离子，采用二元线性混合模型计算不同时期营养盐各来源的贡献率.结果表明，在枯水运行期（11月~次年2月）和汛后蓄水期（9~10月）时，长江干流对支流库湾营养盐贡献率超过75%，干流倒灌为库湾营养盐主要来源；在汛前泄水期（3~5月）和汛期（6~8月）时，干流倒灌和上游来水的贡献率差异缩小，库湾营养盐来源需考虑两者共同的影响，但干流倒灌仍占据优势.上游来水磷营养浓度相对较高，而长江干流氮、硅营养盐浓度较高，不同时期香溪河库湾分层异重流模式不同，库湾营养盐各来源的贡献率也随之改变，因此库湾营养盐在水库不同运行时期呈现出规律性变化. 英文摘要 The process of phytoplankton succession and change in primary productivity are directly determined by the seasonal variations in nutrients in tributary bays of channel reservoirs. This study aimed at analyzing the effects of the main nutrient sources on seasonal distribution of nutrients in Xiangxi Bay based on the field data collected in 2010 and 2011. The tracing inorganic ions were Cl^- and Na⁺ that showed significant differences (P<0.01) between the mainstream and the tributary. The nutrient contribution rates of different sources were calculated by the binary linear model. The results showed that the nutrient contribution rate of the mainstream was more than 75% during the dry season and the impoundment period. The intrusion of the mainstream was the main source of nutrients in Xiangxi Bay. The difference in the contribution rates between the mainstream and the upstream decreased during the pre-flood drawdown period and the flood season. The concentration of total phosphorus was higher in the upstream, while the concentration of total nitrogen was higher in the mainstream. The patterns of density currents were different and the nutrient contribution rates of different sources changed accordingly. Therefore, the nutrients of Xiangxi Bay changed regularly in different operation periods of the Three Gorges Reservoir.

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