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ABELLA, S. R. 2008. A UNIQUE OLD-GROWTH PONDEROSA PINE FOREST IN NORTHERN ARIZONA. JOURNAL OF THE ARIZONA-NEVADA ACADEMY OF SCIENCE 40(1):1-11.
 

Summary: ABELLA, S. R. 2008. A UNIQUE OLD-GROWTH PONDEROSA PINE FOREST IN NORTHERN ARIZONA. JOURNAL OF THE ARIZONA-
NEVADA ACADEMY OF SCIENCE 40(1):1-11.
A UNIQUE OLD-GROWTH PONDEROSA PINE FOREST IN NORTHERN ARIZONA
SCOTT R. ABELLA1
, Ecological Restoration Institute, Northern Arizona University, Flagstaff, AZ
86011-5017
1
Present address: Public Lands Institute and School of Life Sciences, University of Nevada-Las Vegas,
Las Vegas, NV 89154-2040
ABSTRACT
Old-growth ponderosa pine (Pinus ponderosa) forests are uncommon in the Southwest, and only one old-
growth forest (the Gus Pearson Natural Area [GPNA]) has been researched in the ponderosa pine belt sur-
rounding the city of Flagstaff in northern Arizona. The purpose of this study was to measure soil characteris-
tics, current and pre-Euro-American settlement (1885) tree structure, and understory plant composition in a
6-ha remnant old-growth forest on volcanic, red cinder soils. Soil bulk density was extremely low (0.21
Mg/m3
) in this forest because of high volumetric contents of cinders >2 mm diameter. As a result, volumetric
soil moisture, organic C, and total N contents were low, with June gravimetric moisture (0-15 cm) averaging
<1%. Despite these seemingly inhospitable soils, the reconstructed ponderosa pine presettlement density of
183/ha is among the highest reported for northern Arizona. Current density of live presettlement-origin trees

  

Source: Abella, Scott R. - School of Life Sciences, University of Nevada at Las Vegas

 

Collections: Environmental Sciences and Ecology