ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
-2 , not including the surface organic horizon, hereafter call soil C) and its spatial pattern in the mountainous, largely forested western Oregon region. The approaches were (i) USDA NRCS pedons, (ii) other pedons, (iii) the State Soil Geographic Data Base (STATSGO), (iv) the United Nations Soil Map of the World, (v) the National Soil Geographic Data Base (NATSGO), and (vi) an ecosystem-complex map. Agreement between approaches varied with scale. For the entire region (105 km2), estimates of average soil C varied from 4/3 to 6.8 kg C m-2 for the 0- to 20-cm depth and from 12.1 to 16.9 kg C m-2 for the 0- to 100-cm depth. At the subregional scale (≈104 km2), soil C was consistent between individual STATSGO map units and NRCS pedons within those map units, but there was less agreement with other pedons. Rigorous testing of soil-C maps requires data from pedons that are located by objective criteria, in contrast to the subjectively located pedons now available/ The uncertainty associated with regional soil-C amounts and spatial patterns should be considered when soil-C maps are integrated into regional or global assessments of physical and biotic processes because simulation-model outputs may be sensitive to soil C.
Type of Medium:
Electronic Resource
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