%0 Journal Article
%T Soil Pedon Carbon and Nitrogen Data for Alaska: An Analysis and Update
%A Gary J. Michaelson
%A Chien-Lu Ping
%A Mark Clark
%J Open Journal of Soil Science
%P 132-142
%@ 2162-5379
%D 2013
%I Scientific Research Publishing
%R 10.4236/ojss.2013.32015
%X <p class=\"MsoNormal\" style=\"text-align:justify;\">
	<span lang=\"EN-US\">We combined C and N related pedon data
from the USDA-NRCS National Cooperative Soil Survey Soil Characteriza</span><span lang=\"EN-US\">tion Database with data from the
University of Alaska Fairbanks (UAF) northern soils research program, representing
58 and 30 years of field work, respectively. Carbon and N data from 117 UAF
pedons were added to 541 pedons from the USDA-NRCS data set for a total of 658.
Missing carbon (C), nitrogen (N) and related data were added to nearly all of
the USDA-NRCS Arctic region pedons from unpublished UAF data. We present relationships
among soil parameters of the data set that are necessary for calculation of
pedon soil organic C and N stores. These new relationships are nec</span><span lang=\"EN-US\">essary for better estimating missing
soil bulk density (Db) from measured soil organic C by high-temperature combus</span><span lang=\"EN-US\">tion (SOC<sub>HTC</sub>) and for
conversion of acid chromate reduction soil organic carbon (SOC<sub>ACR</sub>)
to SOC<sub>HTC</sub>. For the USDA-NRCS data, missing Db data were estimated
and SOC<sub>ACR</sub> corrected to SOC<sub>HTC</sub> using the new functional
rela</span><span lang=\"EN-US\">tionships
developed. This allowed for pedon SOC and N stores to be calculated for 609 and
468 <st1:place w:st=\"on\"><st1:state w:st=\"on\">Alaska</st1:state></st1:place>
pedons respec</span><span lang=\"EN-US\">tively,
the most available to-date. Additionally, functional relationships were
developed for data within soil orders to estimate total SOC<sub>HTC</sub> and N
stores in pedons with missing surface organic horizons where only thicknesses
were known. These relationships are presented in order to fill-in missing data
and to better define the existing data set for future use. Some 1904 missing Db
data points and 1612 corrected SOC<sub>HTC</sub> data points were added to the
total of 4240 points in the 609 pedons that constitute the updated dataset.
When O-layer thickness functions developed here were used, SOC and N stores
were calculated for an additional 137 and 184 pedons respectively.</span><span lang=\"EN-US\"><o:p></o:p></span> 
</p>
%K Soil Carbon
%K Soil Nitrogen
%K Arctic Soils
%K Pedotransfer Functions
%K Permafrost Soils
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=32828