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ic.ucsc

ic.ucsc.edu. Sytsma 2005. Attiwill et al. 1993. Attiwill et al. 1993. Janse et al. 1997. How does phosphate that stored in forest vegetation and soils move into lakes?. Leaching and transport of soluble orthophosphate through ground or surface waters Transport of soil particles by erosion

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  1. ic.ucsc.edu

  2. Sytsma 2005

  3. Attiwill et al. 1993

  4. Attiwill et al. 1993

  5. Janse et al. 1997

  6. How does phosphate that stored in forest vegetation and soils move into lakes? • Leaching and transport of soluble orthophosphate through ground or surface waters • Transport of soil particles by erosion • Transport of organic material (*)

  7. Sytsma 2005

  8. “For the 10 to 30 year old forests, three out of four study areas had lower landslide densities than found in mature forest, and two of four had reduced erosion volume. For the 31 to 100 year old forests, three out of four study areas had both lower landslides and erosion volume as compared to mature forests. Therefore, for the most erosion prone landscapes, these results also indicate that 10 to 30 year old forests have a 75 percent chance of having a lower landslide density than mature forests. In a similar light, 31 to 100 year old forests have a 75 percent chance of having both lower landslide density and erosion (sediment delivery to channels) as compared with mature forests.” ODF, 1996

  9. Tree Foliage Understory Vegetation Forest Floor Uptake and Return Cole & Rapp, 1981

  10. Sytsma 2005

  11. USDA Forest Service

  12. USDA Forest Service

  13. USDA Forest Service

  14. USDA Forest Service

  15. USDA Forest Service

  16. ODF 1996

  17. ODF 1996

  18. “For the 10 to 30 year old forests, three out of four study areas had lower landslide densities than found in mature forest, and two of four had reduced erosion volume. For the 31 to 100 year old forests, three out of four study areas had both lower landslides and erosion volume as compared to mature forests. Therefore, for the most erosion prone landscapes, these results also indicate that 10 to 30 year old forests have a 75 percent chance of having a lower landslide density than mature forests. In a similar light, 31 to 100 year old forests have a 75 percent chance of having both lower landslide density and erosion (sediment delivery to channels) as compared with mature forests.” ODF, 1996

  19. Google Maps

  20. Possible Research Opportunities • Road density vs. phosphorus loading • Road densities can be obtained from aerial photographs. • It may also be possible to determine when road systems were built by looking at old aerial photographs. • Recently harvested or permanently cleared land area vs. phosphorus loading • ODF maintains data for all harvest operations in Oregon. It may be possible to monitor a lake long-term to see if phosphorus loading changes as harvest • activity increases or decreases in the watershed.

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