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Influence of suspended particulate matter on nutrient biogeochemistry of a tropical shallow lagoon, Chilika, India

机译：悬浮颗粒物对印度Chilika热带浅泻湖养分生物地球化学的影响

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The behaviour of suspended particulate matter (SPM), salinity profile, dissolved nutrients, total (T.Chl-a) and size fractionated chlorophyll-a (F.Chl-a) were studied seasonally at Chilika Lagoon, east coast of India, during 2008-2009. The study showed large spatio-temporal variations among these parameters. The concentration of dissolved inorganic nitrogen and inorganic phosphate were found to be maximum during the monsoon, followed by post- and pre-monsoon, although the mean N:P ratios, which indicate the relative availability of N with respect to P, were 9.13 +/- 3.09, 16.57 +/- 11.53 and 5.47 +/- 3.13, respectively. It was evident from the results that during pre-monsoon and postmonsoon, the lagoon exhibits nitrogen limitation. Mean T.Chl-a biomass in the lagoon showed distinct seasonality with maximum values during the pre-monsoon (23.12 +/- 9.75 mg m(-3)) followed by monsoon and post-monsoon. Irrespective of seasons, maximum T.Chl-a was found in the northern part of the lagoon. SPM concentrations during the monsoon were relatively higher in the freshwater dominated zones compared to seawater dominated areas, indicating its riverine sources. The correlation between SPM and various dissolved nutrients (p < 0.05) suggests its influence on the physico-chemical conditions at varying levels. It is summarized that seasonal variation of SPM and nutrients contributed by rivers, wind induced re-suspension events and in situ regeneration processes play a crucial role in the lagoon biogeochemical cycle.
机译：在印度东海岸的奇利卡泻湖，按季节研究了悬浮颗粒物（SPM），盐分分布，溶解养分，总量（T.Chl-a）和大小分级叶绿素-a（F.Chl-a）的行为。 2008-2009。研究表明这些参数之间存在较大的时空变化。季风期间溶解的无机氮和无机磷酸盐的浓度最高，随后是季风前后，尽管表示N相对于P的相对有效性的平均N：P比为9.13 +分别为3.09、16.57 +/- 11.53和5.47 +/- 3.13。从结果可以明显看出，在季风前和季风后，泻湖表现出氮限制。泻湖中的平均T.Chl-a生物量表现出明显的季节性变化，在季风前（23.12 +/- 9.75 mg m（-3））依次为季风和季风后。不论季节如何，在泻湖北部均发现最大的T.Chl-a。与海水为主的地区相比，季风期间在淡水为主的地区的SPM浓度相对较高，表明其河流来源。 SPM与各种溶解的养分之间的相关性（p <0.05）表明其在不同水平下对理化条件的影响。可以得出结论，河流，海水引起的再悬浮事件和原位再生过程在河流中造成的SPM和养分的季节性变化在泻湖生物地球化学循环中起着至关重要的作用。

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