Short‐term effects of highway construction on the limnology of a small stream in southern Ontario*
Short‐term effects of highway construction on the limnology of a small stream in southern Ontario*
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高速公路建设对安大略省南部一条小溪湖泊学的短期影响*
DOI：
10.1111/j.1365-2427.1977.tb01661.x
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发表时间：
1977
影响因子：
2.7
通讯作者：
B. Barton
中科院分区：
文献类型：
--
作者：
B. Barton
摘要进行了一项湖泊学调查，以记录在安大略南部的一条小溪上修建一条现代高速公路的影响。在施工期间，悬浮固体增加到高达1390毫克/升，但后来又恢复到施工前的水平，<5毫克/升。同样，沉积物沉积量增加了10倍，达到0。61 g干重/cm 2。在暗渠完成后进行河道改道工程期间，在建筑地盘正下方的一天进行。沉积物中有机质的比例下降，表明它们来自施工现场。沉积物很容易被潮水冲走，显然沉淀在下游的池塘里。水化学没有变化。现场正下方的鱼的现存量从24公斤/公顷减少到10公斤/公顷。这种减少并没有发生在下游，受影响的地点的鱼类种群在施工后恢复到原来的水平。在施工期间或施工后，没有观察到浅滩大型无脊椎动物数量的变化。然而，物种组成发生了明显变化。在施工活动期间出现的无脊椎动物可能留在庇护区，以避免沉降影响。在遗址周围裸露区域进行的无脊椎动物采样的证据强烈表明，可能在施工期间被移走的生物很快被漂移所取代。
SUMMARY. A limnological investigation was carried out to document the effects of constructing a modern highway across a small stream in southern Ontario. During construction, suspended solids increased to as high as 1390 mg/l but later returned to pre-construction levels of <5 mg/l. Similarly, sediment deposition increased ten-fold to 0. 61 g dry wt/cm2. day directly below the construction site during stream rechannelization after completion of the culvert. Decreased proportion of organic matter in sediments indicated that they came from the construction site. Sediments were readily removed by spates and apparently settled out in downstream ponds. There was no change in water chemistry. Standing crop of fish was reduced from 24 to 10 kg/ha immediately below the site. This decrease did not occur further downstream and fish populations at the affected site returned to original levels after construction. No change in numbers of riffle macroinvertebrates was observed during or after construction. However, there was a noticeable shift in species composition. Invertebrates present during construction activities may have remained in sheltered areas avoiding sedimentation effects. Evidence from invertebrate sampling in denuded areas around the site strongly suggests that organisms which may have been removed during construction were replaced quickly by drift.