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    Author(s): Ken Hubbert; Matt BusseSteven OverbyCarol ShestakRoss Gerrard
    Date: 2015
    Source: Fire Ecology. 11(2): 100-118
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (815.0 KB)

    Description

    Thinning of conifers followed by pile burning has become a popular treatment to reduce fuel loads in the Lake Tahoe Basin. However, concern has been voiced about burning within or near riparian areas because of the potential effect on nutrient release and, ultimately, lake water quality. Our objective was to quantify the effects of pile burning on soil physical and chemical properties and resulting near-stream surface and subsurface water chemistry. Twenty-seven hand-built piles of three contrasting fuelbed types (large wood; mixed-diameter slash; small-diameter slash) were assessed. Burn sites were located throughout the basin and included both granitic and volcanic parent materials as well as glacial outwash. We suspected post-fire changes in soil physical and chemical properties would ensue as maximum soil surface temperatures averaged 400ºC for all pile types and exceeded 200ºC for > 30 h beneath large-wood piles. Post-fire soil water repellency was greatest for large-wood piles, yet increased for all pile types when soil moisture content fell below a threshold of 7-10% during the dry summer season. Soil bulk density increased moderately whereas water infiltration rates decreased more than fourfold after burning of large-wood piles and mixed-slash piles. Surface runoff and subsurface flow concentrations of nitrate, phosphate, and sulfate were measured downslope from the piles at 6 and 18 months after burning. Mean NO3, ortho-PO4, and SO4 concentrations were low (< 10 mg L-1) at both sampling dates and typically declined downslope from the pile edge. The results showed that pile burning—regardless of fuel composition—had a limited effect on downslope water quality despite associated changes in soil physicochemical properties.

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    Citation

    Hubbert, Ken R.; Busse, Matt; Overby, Steve; Shestak, Carol; Gerrard, Ross. 2015. Pile burning effects on soil water repellency, infiltration, and downslope water chemistry in the Lake Tahoe Basin, USA. Fire Ecology. 11(2): 100-118.

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    Keywords

    fuel reduction, hydrophobicity, overland flow, pile burning, soil heating, water chemistry

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