PROCEEDINGS: Index of Abstracts
SPATIAL PATTERNS IN CARBON STORAGE IN A LAKE STATES'
1-Department of Soil, Water, and Climate, University
of Minnesota, St. Paul, MN 55108. 2-Natural Resources Management
Program, Western Carolina University, Cullowhee, NC 28723.
We estimated total organic carbon storage (C -- kg m-2)
in biomass, forest floor, and soil for a gently undulating glacial
outwash landscape in east-central Minnesota (45° 25'N, 93°
10'W). Abandoned agricultural tracts are common, and nearly 40 percent
of the area is wet mineral or organic soil. Quantitative models
based on 745 point-observations were used to define empirical relationships
between C storage and landscape variables describing forest cover
type and terrain characteristics. Exponential regressions for individual
cover types explained from 31 to 70 percent (p<0.05) of the variation
in soil C and 39 percent (p<0.05) of the variation in peatland
depth. Spatial patterns and quantities of C storage were estimated
by applying these functions to a digital geographic database of
cover type and terrain attributes. Landscape scale (~1:20,000) estimates
of soil C followed a bimodal distribution with means at 4 kg m-2
(mineral soils) and 130 kg m-2 (peatlands). Biomass carbon
for individual cover types ranged from 1 to 13 kg m-2.
Total C storage in all components, based on a 1m soil depth, was
32 kg m-2, with over 90 percent stored in peatlands.