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首页> 外文会议>International Conference on Acidic Deposition >Acidification and liming of river Vikedal, western Norway: a 20 year study of responses in the benthic invertebrate fauna
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Acidification and liming of river Vikedal, western Norway: a 20 year study of responses in the benthic invertebrate fauna

机译：挪威河河河河酸化和黎明：底栖无脊椎动物的响应20年的回应研究

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摘要

This paper deals with benthic invertebrate population responses to acidification and liming in the lower part of River Vikedal. In 1979 the river showed signs of increasing acidification. Highly sensitive invertebrates like the mayfly Baetis rhodani were present in the river in low abundance, hut disappeared in the subsequent years. In order to re-establish a nontoxic water quality for fish, liming of the spring snowmelt to a minimum of pH 5.7 was started in 1987. During the later years liming has been successively increased. The invertebrate fauna showed a slow, but positive, response during the first years after liming, especially during autumn. B. rhodani recolonized the river in low density, but the spring cohort was still weak. Since 1994 the lime dosage was increased to secure a minimum pH of 6.3 during spring snowmelt. This has resulted in an overall increased biodiversity in the limed section of the river. Several acid-sensitive species, like both cohorts of B. rhodani and freshwater snails have colonized this part of the river. Simultaneously biodiversity in the unlimed reference sites has slightly improved during the last years. This is correlated with decreased sulphur deposition and improved surface water chemical conditions.
机译：本文涉及底栖无脊椎动物对河道下部酸化和黎明的反应。 1979年，河流表现出含酸化的迹象。像Mayfly Baetis rhodani这样的高度敏感的无脊椎动物在河里出现在河里低丰度，小屋在随后的几年消失了。为了重新建立鱼类的无毒水质，1987年开始春季雪地融入春天的雪雪橇。在后来的几年里，黎明已经连续增加。无脊椎动物的动物群表现出缓慢但积极的，在黎明后的第一年，特别是在秋天期间。 B. Rhodani以低密度重新播放河流，但春季队列仍然薄弱。自1994年以来，在春季雪花期间增加了石灰剂量以确保最低pH值为6.3。这导致了河流的扳截面的整体生物多样性。几种酸性敏感物种，如B. rhodani和淡水蜗牛的两个群体都殖民地河流。在过去几年中，无赖地参考网站中的同时生物多样性略有提高。这与硫沉积的降低和表面水化学条件的降低相关。

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