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Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales

“Soil and water the foundation of it all…” National Woodlands, Autumn 2007. Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales. Northwest Forest Soils Council Meeting Jan. 29, 2008 . Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales.

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Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales

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  1. “Soil and water the foundation of it all…” National Woodlands, Autumn 2007 Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales Northwest Forest Soils Council Meeting Jan. 29, 2008

  2. Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales Technical Session Theme Background • Moisture supply is a critical factor influencing Douglas-fir productivity in the Pacific Northwest • Significantly influenced by… • Soil physical properties (including organic matter) • Varied soil moisture holding capacity • Climate • Typical dry summers • Ongoing climate changes • Topography • Aspect • Slope percent • Landform position • Stand and competing vegetation conditions

  3. Douglas-fir Soil-Plant Water Relationships: Tree and Landscape Scales Technical Session Theme Background • Previous technical sessions have not focused on this topic • Emphasis in the past on soil disturbance (organic matter removals / compaction / puddling) and nitrogen limitations • Increasing interest in… • understanding the mechanisms of treatment response • productivity potential modeling • Concerns about water use and water yields • Concerns about changing climate • Considerable new work in this area

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