...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oceanographic Literature Review >Planktonic ecosystems: phytoplankton, seston, detritus
【24h】

Planktonic ecosystems: phytoplankton, seston, detritus

机译：浮游生物生态系统：浮游植物，塞斯顿，碎屑

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

The in situ P versus N limitation of northern Baltic Sea phy-toplankton was studied over 3 seasonal cycles at 6 locations, encompassing the large-scale salinity and eutrophy gradients of the Baltic Sea. Limitation patterns were inferred from 170 time-series (3 d) experiments with a replicated factorial experimental design, analyzed using a novel model selection-based classification. Seven limitation classes describe exclusive and primary limitation by N, P, combined N and P, or none. Response parameters were chlorophyll a (chl a) and primary productivity. Although chl a responses reported more N-limited, and ~(14)C responses more P-limited cases, the responses of both parameters were highly similar. Distinct seasonal patterns of in situ P versus N limitation were evident, reproducible, and dissimilar even in closely related environments. The most pristine low-saline areas were dominantly P-limited, while more eutrophied areas showed predominant N limitation even at comparable salinities. The typical Baltic Sea surface salinity regions (5 to 6 PSU) were clearly N-limited either for summer months (e.g. the mildly eutrophied Bothnian Sea), or throughout the growth season (e.g. the eutrophied Gulf of Finland), although terrestrial loading ratios for the Baltic Sea exceed the Redfield ratio several-fold. The commonly vigorous N_2-fixing cyanobacterial blooms in the southern basins do not alleviate the basic N-limitation pattern, and do not appear in the summertime N-limited Bothnian Sea. Management strategies should include toning down the N-limited spring bloom in eutrophied areas, which fuels summertime P release from sediments, in turn favoring cyanobacteria. Terrestrial nutrient loading does not reach offshore areas without significant modification and loss, emphasizing the role of coastal zones in global nutrient cycles and stoichiometry.
机译：研究了波罗的海北部浮游植物在6个地点的3个季节性周期的原位P与N限制，涵盖了波罗的海的大型盐度和富营养度梯度。限制模式是从170个时间序列（3 d）实验得出的，具有重复的阶乘实验设计，并使用基于模型选择的新型分类法进行了分析。七个限制类别描述了N，P，N和P组合或不限制的排他限制和主要限制。响应参数为叶绿素a（chla）和初级生产力。尽管chl a反应报道了更多的N限制，〜（14）C反应报道了更多的P限制情况，但这两个参数的反应高度相似。即使在密切相关的环境中，原位磷与氮限制的明显季节性模式也很明显，可重现且不相似。最原始的低盐度地区主要是P限，而富营养化地区即使在相当的盐度下也显示出主要的N限。典型的波罗的海表面盐度区域（5至6 PSU）显然在夏季（例如，温和富营养化的波特尼亚海）或整个生长季节（例如，富营养化的芬兰湾）都受到N限制，尽管波罗的海超过雷德菲尔德比率的几倍。南部盆地普遍活跃的固定N_2的蓝细菌水华并没有减轻基本的N限制模式，也没有出现在夏季N限制的波特尼亚海中。管理策略应包括淡化富营养化地区的N极限春季开花，这促进了夏季P从沉积物中释放出来，进而有利于蓝细菌。没有显着的改变和损失，陆地养分负载不会到达近海地区，强调了沿海地区在全球养分循环和化学计量中的作用。

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