...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >A mechanism for onset of diatom blooms in a fjord with persistent salinity stratification
【24h】

A mechanism for onset of diatom blooms in a fjord with persistent salinity stratification

机译：持续盐度分层的峡湾中硅藻绽放的机制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We demonstrate that episodic high freshwater influx from the Manapouri hydroelectric power station and storms promote diatom blooms (15 mg chlorophyll m~(-3)) during spring, summer and autumn in Doubtful Sound, New Zealand, a fjord with semipermanent salinity stratification. Diatom blooms form when mixing of the surface low salinity layer (LSL — high in silicic acid and low in nitrate and phosphate) and the underlying saline layer (SL — low in silicic acid but relatively high in nitrate and phosphate) reduce nutrient limitations in the thin photic zone of the fjord. We used time series of salinity, macronutrient concentrations, irradiance, and chlorophyll a (February 1997 to January 1999) from stations along the main axis of the fjord to investigate this proposed mechanism. A multiple regression analysis reveals that increases in wind velocity and silicic acid and decrease in phosphate explained 27% of the variance in phytoplankton stocks, indicating that natural and anthropogenic increases in freshwater and silicic acid input and mixing of the LSL and SL play an important role in supporting a predominant diatom community in this system.
机译：我们证明了在春季，夏季和秋季期间，来自Manapouri水力发电站的暴发性高淡水涌入和暴风雨促进了硅藻的绽放（15 mg叶绿素m〜（-3））在新西兰Doubtful Sound（半永久盐度分层的峡湾）。当表面低盐度层（LSL-硅酸含量高，硝酸盐和磷酸盐含量低）和下面的盐层（SL-硅酸含量低，但硝酸盐和磷酸盐含量相对较高）混合降低硅藻的营养限制时，硅藻就会形成水华。峡湾的薄光带。我们使用了沿峡湾主轴站的盐度，大量营养物浓度，辐照度和叶绿素a（1997年2月至1999年1月）的时间序列，以研究此提议的机制。多元回归分析表明，风速和硅酸的增加以及磷酸盐的减少解释了浮游植物种群变化的27％，这表明淡水和硅酸输入的自然和人为增加以及LSL和SL的混合起着重要作用。在该系统中支持主要的硅藻群落。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号