What is the 5-year risk of Douglas-fir decline and mortality at larger spatial scales?
This following risk rating systems assesses the likelihood of encountering Douglas-fir decline and mortality in the next 5 years at the watershed or landscape scale, the abundance and severity of mortality, and the probability that mortality will increase in that area. Two risk rating systems are provided, one based on average annual precipitation (Table A3) and one based on climatic water deficit (Table A4). This Douglas-fir mortality webmap includes layers for mean annual precipitation (4 km gridcell) and mean annual climatic water deficit (90 m gridcell generalized to polygons) to aid in evaluating landscape mortality risk.
Table A3. Relative Douglas-fir mortality risk by precipitation zones
Table A4. Relative risk by climatic water deficit
