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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

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Abstract

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.

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Authors and Affiliations

  1. Environmental Conservation Branch, Environment Canada Atlantic Region, 45 Alderney Drive, Dartmouth, NS, B2Y 2N6, Canada

    O. C. Vaidya & T. P. Smith

  2. Environmental Conservation Branch, Environment Canada, P.O. Box 23005, Moncton, NB, E1A 6S8, Canada

    H. Fernand

  3. NS Department of Natural Resources, P.O. Box 698, Halifax, NS, B3J 2T9, Canada

    Nancy R. McInnis Leek

Authors
  1. O. C. Vaidya
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  2. T. P. Smith
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  3. H. Fernand
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  4. Nancy R. McInnis Leek
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Correspondence to O. C. Vaidya.

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Vaidya, O.C., Smith, T.P., Fernand, H. et al. 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. Environ Monit Assess 137, 1–14 (2008). https://doi.org/10.1007/s10661-006-9370-y

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  • DOI: https://doi.org/10.1007/s10661-006-9370-y

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