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Buffer strips

July 26, 2006      

Contents:

• Environment Canada's interim narrative on regression analysis between stream buffer widths and average TN and TP concentrations- 100 and 250 metre buffer strips

• A "Standard Buffer" is defined as a particular length of site capable of trapping 953 kg. of sediment per year (USDA, 1977)

• Hydrogeochemical Responses to Forestry- 30 to 60 metre buffers

• Factors involved in the magnitude of P transfer (Haygarth, 1997)

• The trophic guidelines of the CCME, and the indicator thresholds for anthropogenic stressors of freshwater lakes in Nova Scotia!

• Soils and Erosion

• Effects of silt

Environment Canada's interim narrative on regression analysis between stream buffer widths and average TN and TP concentrations

A "Standard Buffer"

Hydrogeochemical Responses to Forestry, Hayward-Holmes Watershed, New Brunswick

The comparison of data indicates that minimal response was found in selected treatment. Results indicate that at least 17% of a watershed can be harvested with no stream response if a 30 or 60 metre stream buffer remains. The selection harvest within the buffer did not show a response. The most significant factor influencing treatment is buffer width, percent area and time required to re-vegetate. Other responses were due to erosion from road construction and the use of corrosive metal culverts.

The selection cut must allow sufficient timber to remain to utilize possible enhanced nutrient flux from the adjacent clear cut.

Factors involved in the magnitude of P transfer

• The selectivity of the erosion process for fine material, since P is associated predominantly with the clay-size fraction (<2 µm).
• Sorption of P during transport.
• Selectivity of erosion for organic matter or clay minerals which have a larger surface area and therefore a large capacity to sorb P during P transport.
• The use of buffer strips and riparian zones are useful, but should not be viewed as the ultimate solution.

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