Forest Productivity, Leaf Area, and Terrain in Southern Appalachian Deciduous Forests
Leaf area index (LAI) and aboveground net primary production (ANPP) were measured on 16 forest stands in the southern Appalachian Mountains. These stands span a range of elevation, slope position, temperature, and moisture regimes. LAI averaged 5.8 m2 m-2 and ranged from 2.7 to 8.2. ANPP averaged 9.2 Mg ha-1 yr-1 and ranged from 5.2 to ll.8 Mg ha-1 yr-1.
LAI and ANPP decreased significantly from cove to ridge sites, and ANPP decreases significantly from low to high elevation (P < 0.05, linear regression slope). Elevation-related differences in ANPP do not appear to be due to changes in precipitation, leaf nitrogen content, or site N mineralization rates.
Linear ANPP-LAI equations fit to the data measured in this study were significant (P < 0.05). These relationships were not significantly different (P > 0.1) from linear relationships based on data reported in most other studies of ANPP and LAI in eastern deciduous forests of North America. However, the slope of a linear regression model based on North American eastern deciduous forests was significantly different (P < 0.05) from one based on data collected in temperate deciduous forests for the rest of the globe. The differences were slight over the range of observed data, however, and the difference may be due to a narrower range of data for North American deciduous forests. For. Sci. 47(3):419–427.
Keywords: ANPP; LAI; elevation; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; precipitation; temperature
Document Type: Miscellaneous
Affiliations: 1: Department of Forest Resources, University of Minnesota, 1530 Cleveland Ave. N., St. Paul, MN, 55108, [email protected] 2: Coweeta Hydrologic Lab, USDA Forest Service, 3160 Coweeta Lab Rd., Otto, North Carolina, 28763 3: Southern Forest Experiment Station, USDA Forest Service, 1509 Varsity Dr., Raleigh, NC, 27606
Publication date: 01 August 2001