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首页> 外文期刊>Transitional Waters Bulletin >Spatial and temporal variations of nutrients and chlorophyll a in a Mediterranean coastal lagoon: Varano lagoon, Italy
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Spatial and temporal variations of nutrients and chlorophyll a in a Mediterranean coastal lagoon: Varano lagoon, Italy

机译：地中海沿海泻湖中养分和叶绿素a的时空变化：意大利瓦拉诺泻湖

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The purpose of this paper is to assess the present status of a Mediterranean lagoon (Varano lagoon, Italy), basing on nutrient and chlorophyll a data. A water sampling in Varano lagoon was performed at 7 fixed stations from February 2004 to July 2005, collecting surface water samples to analyse ammonia, nitrite, nitrate, soluble reactive phosphorus (SRP) and soluble reactive silica (SRSi), chlorophyll a (chl a ) and total suspended solids (TSS). Spatial and temporal distributions of chemical and biological parameters in Varano lagoon were examined to accomplish the goal of this study. Statistical tests were used to investigate the correlations between analysed variables and to characterize, from a spatial and temporal point of view, the lagoon in relation to each variable. Ammonia and nitrate did not showed good correlation (P<0.05). SRP was not correlated with any nutrient (only with Chl a , P<0.05). The seasonal distribution show a random pattern for soluble reactive phosphorus with relatively low mean concentrations (0.16 ± 0.03 μM) and a well-defined seasonal pattern for nitrate, with the highest mean value (34.44 ± 10.18 μM) recorded in the wet season (February 2004) and a high spatial variability. The most homogeneous chl a values were observed in both autumn and winter seasons with averages of about 1-1.5 μg . L -1 ; in contrast, higher mean values (5.50 μg . L -1 ) were recorded in July 2005. The ratio between the dissolved inorganic nitrogen species and SRP (N/P) in Varano lagoon was constantly high and it varied seasonally from about 300:1 during rainy seasons to 60-90:1 during dry seasons. High values of the N/P ratio in autumn and winter were accompanied by an increase in total N implying an input of nitrogen to the system probably associated with rainfall. The high fluctuation in the various chemical parameters in the lagoon during the rainy season suggested that this is the period of large variability, in which environmental processes as marine waters, freshwaters and wastewaters represent inputs that determine the spatial behaviour of the system.
机译：本文的目的是根据营养素和叶绿素a数据评估地中海泻湖（瓦拉诺泻湖，意大利）的现状。 2004年2月至2005年7月，在7个固定站对Varano泻湖进行了一次水采样，收集了地表水样本，以分析氨，亚硝酸盐，硝酸盐，可溶性反应性磷（SRP）和可溶性反应性二氧化硅（SRSi），叶绿素a（chl a）。 ）和总悬浮固体（TSS）。为了实现本研究的目的，研究了瓦拉诺泻湖中化学和生物学参数的时空分布。统计测试用于调查分析变量之间的相关性，并从空间和时间的角度表征与每个变量相关的泻湖。氨和硝酸盐之间没有很好的相关性（P <0.05）。 SRP与任何营养素均不相关（仅与Chla相比，P <0.05）。季节分布显示可溶性反应磷的随机模式，其平均浓度相对较低（0.16±0.03μM），硝酸盐的季节定义明确，在湿季（2月）记录的平均值最高（34.44±10.18μM） 2004）和高空间变异性。在秋季和冬季均观察到最均匀的chl a值，平均值约为1-1.5μg。 L -1;相比之下，2005年7月记录的平均值更高（5.50μg。L -1）。瓦拉诺泻湖中溶解的无机氮物种与SRP（N / P）的比率一直很高，并且季节性变化约为300：1。在雨季到旱季60-90：1。在秋季和冬季，N / P比值较高，总氮含量增加，这意味着可能与降雨有关的氮输入系统。雨季泻湖中各种化学参数的高波动表明，这是一个多变性的时期，其中海水，淡水和废水等环境过程代表着决定系统空间行为的输入。

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