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首页> 外文期刊>Environmental Monitoring and Assessment >Forestry Best Management Practices: Evaluation of Alternate Streamside Management Zones on Stream Water Quality in Pockwock Lake and Five Mile Lake Watersheds in Central Nova Scotia, Canada
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Forestry Best Management Practices: Evaluation of Alternate Streamside Management Zones on Stream Water Quality in Pockwock Lake and Five Mile Lake Watersheds in Central Nova Scotia, Canada

机译：林业最佳管理实践：加拿大新斯科舍省中部的Pockwock湖和五英里湖流域的溪流水质替代溪流管理区评估

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摘要

The effects of timber harvesting on stream water quality and efficiency of alternate streamside management zones were evaluated in Pockwock Lake and Five Mile Lake watersheds in central Nova Scotia, Canada. The streamside management zone (SMZ) included a 20 m no cut, 20 m select cut and a 30 m select cut buffer strips along the stream. Water quality of eight streams, six in harvested and two in not-harvested watersheds were monitored for two years before and two years after the harvesting of timber. Nonparametric statistical tests on stream water quality showed that there was significant change in the concentration of potassium in six streams, manganese in five streams, zinc in two streams and total nitrogen in one stream after timber harvesting. There was no significant change in the quality of water in two streams used as control sites in the neighboring watersheds of similar size and hydrological characteristics. The results show that forest management practices were most favorable in streams maintained with 30 m select cut followed by 20 m no cut and 20 m select cut SMZ. The streamside zone width and treatment of select cut or no cut in the zone played an important role in filtering or retaining the minerals in surface water runoff. In buffer zones of similar width, the buffer zone with no cut or forested buffer was relatively more effective at protecting stream water quality than select cut SMZ. The vegetation in the zone may have decreased the flow velocity and increased residence time and thus increased filtration and retention of minerals in the riparian soil.
机译：在加拿大新斯科舍省中部的Pockwock湖和5 Mile Lake流域，评估了木材采伐对溪流水质和备用溪流管理区效率的影响。溪流管理区（SMZ）包括沿河段20 m的无切段，20 m的选择段和30 m的选择段缓冲带。木材采伐前两年和采伐后两年均监测了八股溪流的水质，其中六股已收割，两处未收割。对溪流水质量的非参数统计测试表明，木材采伐后，六溪流中的钾浓度，五溪流中的锰，两溪流中的锌和一溪流中的总氮含量发生了显着变化。在具有相似大小和水文特征的邻近流域中，用作控制点的两条河流的水质没有明显变化。结果表明，在维持30 m选择砍伐，随后20 m不砍伐和20 m选择砍伐的SMZ维持的溪流中，森林管理实践最为有利。溪流带宽度和该区域选择或不选择切口的处理在过滤或保留地表水径流中的矿物方面起着重要作用。在宽度相似的缓冲区中，没有切口或林间缓冲区的缓冲区在保护溪流水质方面比选择切口SMZ相对更有效。该区域的植被可能降低了流速并增加了停留时间，因此增加了河岸土壤中矿物质的过滤和保留。

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