Long Description of Figure 8:

Graph (all values are approximate) -- COLUMN 1: NW PIPO (northwest ponderosa pine forest) Mollisol (location: Oregon; Source: Klicker), soil moisture regime - Xeric, soil temperature regime - Frigid, Total solum or 3 ft. depth - 1,350-3,400 lb/acre nitrogen, A horizon - 0-1,349 lb/acre nitrogen; COLUMN 2: ABGR (grand fir/Abies grandis)/PSME (Douglas-fir/Pseudotsuga menziesii var glauca) Andisol (location: Washington; Source: Nevine), soil moisture regime - Xeric, soil temperature regime - Frigid, Total solum or 3 ft. depth - 550-4,250 lb/acre nitrogen, A horizon - 0-549 lb/acre nitrogen; COLUMN 3: NW PIPO (northwest ponderosa pine forest) Pumiceous Andisol with bitterbrush (PUTR - Purshia tridentata) understory (location: Oregon; Source: Lapine), soil moisture regime - Xeric, soil temperature regime - Cryic, Total solum or 3 ft. depth - 1,050-1,650 lb/acre nitrogen, A horizon - 0-1,049 lb/acre nitrogen; COLUMN 4: NW PIPO (northwest ponderosa pine forest) Pumiceous Andisol with snowbrush (CEVE - Ceanothus velutinus) understory (location: Oregon; Source: Lapine), soil moisture regime - Xeric, soil temperature regime - Cryic, Total solum or 3 ft. depth - 1,450-2,100 lb/acre nitrogen, A horizon - 0-1,449 lb/acre nitrogen.