Effects of Afforestation on Acidity and Invertebrates in Danish Streams and Implications for Freshwater Communities in Denmark
Effects of Afforestation on Acidity and Invertebrates in Danish Streams and Implications for Freshwater Communities in Denmark
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造林对丹麦溪流酸度和无脊椎动物的影响以及对丹麦淡水社区的影响
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
S. Larsen
中科院分区：
文献类型：
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作者：
N. Friberg;Aage Rebsdrof;S. Larsen
酸度和底栖无脊椎动物群落之间的关系进行了调查，在两个小溪流中的针叶林在日德兰半岛中部，丹麦，在1992年和1993年。溪流pH值为酸性（平均pH值为4.8和5.4），碱度波动很大，平均值在零附近。在降雨过程中，水从上游的泉水与高铝含量的棕色腐殖酸水下游混合，和pH值下降，从附近的温泉周围中性pH值低于4在很短的距离（0.5-1.5公里）。底栖无脊椎动物群落在最酸性的下游河段的两条溪流占主导地位的filipalpian石蝇，主要是黑银（Olv.）。在整个采样期间，尽管pH值的变化，群落组成仍然非常相似。在上游（中性）河段，无脊椎动物不耐受低pH值，如钩虾。流中的氯化物和硫酸盐的浓度是在附近的高沼地流中的浓度的两倍以上，表明酸化大气沉积对两个森林流的强烈影响。这项研究的结果表明，针叶树造林桑迪丹麦土壤的缓冲能力低（约25%的丹麦土地总面积）可能会导致增加酸化的表面沃茨，从而也贫困的水生动物。
The relationship between acidity and benthic invertebrate communities was investigated in two small streams in coniferous forests in central Jutland, Denmark, during 1992 and 1993. Stream pH was acid (mean pH 4.8 and 5.4) and alkalinity fluctuated greatly with mean values around zero. During rain events, water from springfed reaches upstream were mixed downstream with brown humic acid water with high aluminium content, and pH declined from circumneutral near the springs down to pH below 4 over a very short distance (0.5–1.5 km). The benthic invertebrate communities in the most acidic downstream reaches of both streams were dominated by filipalpian stoneflies, mainly Leuctra nigra (Olv.). Community composition remained very similar throughout the sampling period despite variations in pH. In the upper (neutral) reaches invertebrates intolerant of low pH such as Gammarus pulex L. were found. The concentrations of chloride and sulphate in the streams were more than double the concentrations in a nearby moorland stream indicating a strong impact of acidifying atmospheric deposition on the two forest streams. Results of this study indicate that afforestation with conifers on sandy Danish soils with low buffering capacity (about 25% of the total Danish land area) may lead to an increased acidification of surface waters and thereby also to an impoverished aquatic fauna.