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首页> 外文期刊>Estuarine Coastal and Shelf Science >Alkaline Phosphatase Activity In The Western English Channel: Elevations Induced By High Summertime Rainfall
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Alkaline Phosphatase Activity In The Western English Channel: Elevations Induced By High Summertime Rainfall

机译：西方英语频道中的碱性磷酸酶活性：夏季高降雨引起的海拔升高

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摘要

Alkaline phosphatase activity (APA) was determined in bulk particulate material and in a single-cell (ELF) assay at station L4 in the western English Channel during the summer of 2007. Throughout this period, the UK experienced its heaviest summertime rainfall since records began in 1914; with the result that riverine run-off into coastal waters was also elevated relative to long-term averages. Between May and August 2007, three distinct periods of elevated river run-off were observed which resulted in salinity minima at L4 on days 141, 190 and 232. An extended period of high river run-off between days 170 and 210 was responsible for decreases in near-surface salinity at L4 from 35.2068 to a minimum on day 190 of 34.7422. This contributed to the development of haline stratification which supported the development of an intense bloom of the centric diatom Chaetoceros debelis, with maximum observed chlorophyll a concentration of 8.69 μg l~(-1). Minima in salinity, and maxima in chlorophyll concentration on day 190 were coincident with a peak in river-derived dissolved inorganic nitrogen (DIN) of 1.9 μmol l~(-1) which was ＞ 5 times greater than the summertime mean and 24 times the concentrations experienced at L4 on weeks immediately before and after. There was no accompanying increase in dissolved inorganic phosphorus (DIP), and the DIN:DIP ratio increased to 49. With the inherent phosphorus stress that this caused, rates of APA increased from ＜ 4 to 42.4 nmolP l~(-1) h~(-1). ELF analysis on day 197 identified two taxa actively expressing alkaline phosphatase: the dinoflagellate Prorocentrum micans and ciliate Tiarana sp.
机译：在2007年夏季，在西部英吉利海峡L4站的散装颗粒物和单细胞（ELF）分析中测定了碱性磷酸酶活性（APA）。在此期间，自记录开始以来，英国经历了夏季最大的降雨在1914年；结果，相对于长期平均值，流入沿海水域的河流径流也有所增加。在2007年5月至2007年8月之间，观察到三个明显的河流径流量升高时期，导致141、190和232天的L4盐度极低。在170天和210天之间，延长的高河流径流量导致减少L4的近地表盐度从35.2068降至第190天的最低值34.7422。这促进了盐分分层的发展，这支持了中心硅藻Chaetoceros debelis的强烈开花发展，最大观察到的叶绿素浓度为8.69μgl〜（-1）。 190天的盐度最小值和叶绿素浓度最大值与河源的溶解性无机氮（DIN）的峰值相符，为1.9μmoll〜（-1），比夏季平均值大＞ 5倍，是夏季平均值的24倍。前后前后几周的L4浓度。溶解的无机磷（DIP）并没有随之增加，DIN：DIP比值增加到49。由于固有的磷胁迫，APA的速率从＜4增加到42.4 nmolP l〜（-1）h〜 （-1）。第197天的ELF分析确定了两个活跃表达碱性磷酸酶的类群：鞭毛原鞭毛虫和纤毛Tiarana sp。

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