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首页> 外文期刊>european journal of phycology >An experimental and palaeoecological study of algal responses to lake acidification and liming in three central Swedish lakes
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An experimental and palaeoecological study of algal responses to lake acidification and liming in three central Swedish lakes

机译：瑞典中部三个湖泊中藻类对湖泊酸化和石灰反应的实验和古生态学研究

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Contemporary phytoplankton and palaeolimnological studies were made of the algal response to acidification and liming in three lakes in H#xE4;lsingland, central Sweden (Njupfatet, Sj#xF6;sj#xF6;n, Djuptj#xE4;rn). Surveys and experimental studies of the phytoplankton response to liming were undertaken at Njupfatet, together with an experiment designed to determine the possible role of lake sediments as an inoculum for any new species arriving in the water column. Liming had little quantitative or qualitative effect on the phytoplankton diversity at Njupfatet, but did result in the loss of the dominant contributor to algal biomass,Merismopedia tenuissima. None of the four new species recorded in the lake following liming was hatched from the sediment inoculum experiment. A freeze core from Njupfatet was dated by210PPb and carbonaceous fly-ash particle profiles were also determined for Njupfatet and Sj#xF6;sj#xF6;n, which provided an approximate chronology for the latter lake. Diatom analyses were made of the three lakes and pH and dissolved organic carbon inferred using weighted averaging methodology. Njupfatet had no planktonic diatoms over the last 200#x2013;300 years, and was dominated by benthic diatoms, but the diatom-inferred pH suggests that the lake was acidified to pH#x2009;#x2009;5 prior to liming in 1989. Both Djuptj#xE4;rn and Sj#xF6;sj#xF6;n were dominated by planktonic diatoms, and were acidifying from (c. 1970) prior to liming, Sj#xF6;sj#xF6;n from pH 6 to #x223C;5 and Djuptj#xE4;rn from 6.5 to #x223C;5.5. These pH inferences suggest that at least some lakes in this region are susceptible to atmospheric acidification. The response of the diatoms to liming is discussed, in particular the rapid expansion at Njupfatet, ofCyclotella glomerataa diatom which was also present in Sj#xF6;sj#xF6;n for a period prior to acidification, and at other lakes in south-west Sweden. Possible reasons for the expansion of this small centric diatom are discussed.
机译：当代浮游植物和古生物学研究是对瑞典中部海尔辛兰三个湖泊（Njupfatet、Sjösjön、Djuptjärn）的藻类对酸化和石灰的反应。在Njupfatet对浮游植物对石灰的反应进行了调查和实验研究，并进行了一项实验，旨在确定湖泊沉积物作为到达水体的任何新物种的接种物的可能作用。石灰对Njupfatet浮游植物多样性的定量和定性影响不大，但确实导致了藻类生物量的主要贡献者Merismopedia tenuissima的丧失。在石灰之后在湖中记录的四个新物种中，没有一个是从沉积物接种实验中孵化出来的。Njupfatet的冰冻岩芯的年代为210PPb，Njupfatet和Sjösjön的碳质粉煤灰颗粒剖面也确定了，这为后者提供了大致的年代。对三个湖泊进行硅藻分析，使用加权平均法推断出pH值和溶解有机碳。在过去的200-300年里，Njupfatet没有浮游硅藻，以底栖硅藻为主，但硅藻推断的pH值表明，在1989年石灰之前，该湖已经酸化到pH值<5。Djuptjärn 和 Sjösjön 都以浮游硅藻为主，从石灰之前（约 1970 年）开始酸化，Sjösjön 从 pH 值 6 到 ∼5，Djuptjärn 从 6.5 到 ∼5.5。这些pH值推论表明，该地区至少有一些湖泊容易受到大气酸化的影响。讨论了硅藻对石灰的响应，特别是Cyclotella glomerataa硅藻在Njupfatet的快速膨胀，该硅藻在酸化前的一段时间内也存在于Sjösjön，以及瑞典西南部的其他湖泊。讨论了这种小中心硅藻膨胀的可能原因。

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