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首页> 外文期刊>Hydrology research >Reconciling observed and modelled phytoplankton dynamics in a major lowland UK river, the Thames
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Reconciling observed and modelled phytoplankton dynamics in a major lowland UK river, the Thames

机译：协调在英国主要低地河泰晤士河中观察到的和模拟的浮游植物动力学

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摘要

This study aims to elucidate the key mechanisms controlling phytoplankton growth and decay within the Thames basin through the application of a modified version of an established river-algal model and comparison with observed stream water chlorophyll-a concentrations. The River Thames showed a distinct simulated phytoplankton seasonality and behaviour having high spring, moderate summer and low autumn chlorophyll-a concentrations. Three main sections were identified along the River Thames with different phytoplankton abundance and seasonality: (i) low chlorophyll-a concentrations from source to Newbridge; (ii) steep concentration increase between Newbridge and Sutton; and (iii) high concentrations with a moderate increase in concentration from Sutton to the end of the study area (Maidenhead). However, local hydrologic (e.g. locks) and other conditions (e.g. radiation, water depth, grazer dynamics, etc.) affected the simulated growth and losses. The model achieved good simulation results during both calibration and testing through a range of hydrological and nutrient conditions. Simulated phytoplankton growth was controlled predominantly by residence time, but during medium-low flow periods available light, water temperature and herbivorous grazing defined algal community development. These results challenge the perceived importance of in-stream nutrient concentrations as the perceived primary control on phytoplankton growth and death.
机译：本研究旨在通过应用已建立的河藻模型的改进版本并与观察到的溪流水中叶绿素a浓度进行比较，阐明控制泰晤士河盆地内浮游植物生长和衰退的关键机制。泰晤士河显示出明显的模拟浮游植物季节性和行为，春季，夏季适中，秋季的叶绿素-a浓度较低。在泰晤士河沿岸，确定了三个主要区域，具有不同的浮游植物丰度和季节性：（i）从源头到新桥的叶绿素-a浓度低； （ii）新桥和萨顿之间的浓度急剧上升； （iii）从萨顿（Sutton）到研究区域末端（Maidenhead），浓度适度增加。但是，当地的水文（例如水闸）和其他条件（例如辐射，水深，放牧者动力学等）影响了模拟的生长和损失。该模型在一系列水文和营养条件下的校准和测试过程中均获得了良好的模拟结果。模拟浮游植物的生长主要由停留时间控制，但在中低流量时期，可用的光照，水温和草食性放牧确定了藻类群落的发育。这些结果挑战了人们认为河内营养物浓度作为浮游植物生长和死亡的主要控制因素的重要性。

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  • 来源
    《Hydrology research》 |2012年第5期|p.576-588|共13页
  • 作者

    Attila N. Lazar; A. J. wade; P. G. whitehead; C. Neal; M. Loewenthal;

  • 作者单位

    School of Human and Environmental Sciences,University of Reading,Reading, RG6 6AB,UK;

    School of Human and Environmental Sciences,University of Reading,Reading, RG6 6AB,UK;

    School of Geography and the Environment,University of Oxford,Oxford, 0X1 3QY,UK;

    Centre for Ecology and Hydrology,Maclean Building,Crowmarsh Gifford,Wallingford, OX10 8BB,UK;

    Environment Agency,Reading, RG2 OSF,UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    algae; dynamic model; environmental controls; phytoplankton; river thames; seasonality;

    机译：藻类动态模型环境控制;浮游植物泰晤士河;季节性;

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