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Biosolids applications affect runoff water quality following forest fire
V F Meyer1, E F Redente, K A Barbarick
1Dep. of Rangeland Ecosystem Science, Colorado State Univ., Fort Collins 80523, USA.
Journal of Environmental Quality
|October 2, 2001
Summary
Applying composted biosolids after forest wildfires significantly reduced sediment runoff and increased plant cover, aiding in erosion control. Biosolids application did not significantly affect total runoff volume.
Area of Science:
- Environmental Science
- Soil Science
- Forestry
Background:
- Forest wildfires cause significant soil erosion and nutrient loss.
- Revegetation and soil stabilization are critical post-wildfire challenges.
- Biosolids application is a potential strategy to mitigate these impacts.
Purpose of the Study:
- To evaluate the effectiveness of composted biosolids in reducing soil erosion and improving revegetation after a severe forest wildfire.
- To assess the impact of different biosolids application rates on runoff volume, sediment concentration, and water quality.
Main Methods:
- Composted biosolids from Denver Metro Wastewater District were applied at 0, 40, and 80 Mg ha(-1) to a burned forest site.
- Simulated rainfall (100 mm h(-1) for 30 min) was applied to paired plots.
- Soil types included Ustorthents, Ustochrepts, and Haploborols.
- Runoff volume, sediment concentration, and water quality constituents were measured.
Main Results:
- Biosolids application rates did not significantly affect mean total runoff volume.
- Sediment concentrations were significantly lower in plots treated with 80 Mg ha(-1) biosolids compared to control plots.
- Plant cover and growth were increased by biosolids application.
- Runoff water quality constituents were generally below drinking water standards, with the exception of lead (Pb).
Conclusions:
- Composted biosolids application can effectively reduce sediment loss and enhance plant cover on severely burned forest sites.
- Biosolids show promise for post-wildfire rehabilitation and erosion control.
- Further research is needed to address potential lead contamination and long-term effects.
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