| 三峡库区典型干-支流相互作用过程中的营养盐交换:以梅溪河为例 |
| 摘要点击 2579 全文点击 1257 投稿时间：2014-09-25 修订日期：2014-12-01 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 三峡水库 干流倒灌 梅溪河 营养盐交换 通量 |
| 英文关键词 Three Gorges Reservoirs (TGR) backward flow from mainstream Meixi River nutrient exchange flux |
|
| 中文摘要 |
| 三峡水库建成以后,梅溪河库湾多次发生水华现象,为研究干流水体倒灌对库湾营养盐的影响,于 2012年 8月至 2013年 7月对受干流回水影响的梅溪河进行了详细的现场监测.结果表明,三峡水库在不同的水位调度时期,梅溪河库湾水体均表现为分层异向流动; 受长江干流倒灌影响,梅溪河库湾营养盐分布季节变化显著, DIN的年倒灌净通量约为 5478.02 t, DIP的年倒灌净通量约为 234.04 t, DSi的年倒灌净通量约为 5935.22 t,长江干流每年对梅溪河 DIN、DIP、DSi的补给量分别约为源头输入量的 2.37倍、4.32倍和 1.33倍; 干流倒灌对库湾营养盐分布的影响不仅局限在河口区域,对梅溪河中上游的营养盐分布也将造成影响,干流倒灌对库湾P的补给将对库湾P限制起到缓解作用,为藻类的暴发提供必要条件. |
| 英文摘要 |
| Frequent algal blooms have been observed in the Meixi bay of the Three Gorges Reservoirs (TGR) since its initial filling. In order to understand the effects of intrusions from Changjiang mainstream on the nutrient supply of the Meixi Bay, a detailed field monitoring was conducted from August 2012 to July 2013. The results showed that there were significant intrusions from the mainstream to the Meixi Bay during the different water level scheduling periods of the TGR. As a result, the invading flow from the mainstream of the Changjiang caused a significant effect on the nutrient distribution in the Meixi River. Annually, the mainstream transportednet fluxes of 5478.02 t DIN, 234.04 t DIP and 5935.22 t DSi to the Meixi Bay, which were 2.37 times, 4.32 times and 1.33 times of the corresponding fluxes from the upstream, respectively. The influence on the nutrient distributions was not only limited in the estuary area but also in the upper reaches, the supply of DIP changed the nutrient structure and relieved the P restrictions on phytoplankton growth. |
|
|
|
