HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by Dai, X.Y. Articles by Zech, W. Search for Related Content PubMed Articles by Dai, X.Y. Articles by Zech, W. GeoRef GeoRef Citation Agricola Articles by Dai, X.Y. Articles by Zech, W.

Characterization of Soil Organic Matter Fractions of Tundra Soils in Arctic Alaska by Carbon-13 Nuclear Magnetic Resonance Spectroscopy

^a Agricultural and Forestry Experiment Station, Univ. of Alaska, 533 E. Fireweed, Palmer, AK 99645 USA
^b Institute of Soil Science and Soil Geography, Univ. of Bayreuth, 99440 Bayreuth, Germany

View larger version (27K): [in a new window]   Fig. 1. Liquid-state 13C nuclear magnetic resonance (NMR) spectra of HA, FA, LMA, HON, and LMN derived from alkali extracts of the Oa1 horizon in Site 1 soil. HA, humic acids (14700 scans); FA, fulvic acids (13801 scans); LMA, low-molecular-weight acids (17000 scans); HON, hydrophobic neutrals (14001 scans); LMN, low-molecular-weight neutrals (14220 scans)

View larger version (28K): [in a new window]   Fig. 2. Liquid-state 13C nuclear magnetic resonance (NMR) spectra of HA, FA, and LMA derived from alkali extracts of the Oa2 horizon in Site 1 soil. HA, humic acids (16710 scans); FA, fulvic acids (14001 scans); LMA, low-molecular-weight acids (13760 scans)

View larger version (22K): [in a new window]   Fig. 3. Cross-polarization, magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) spectra of the whole soils from Site 1 (Oa1 and Oa2 horizons), Site 2 (Oe and O/A horizons), and Site 3 (Cf horizons) 8829 and 13499 scans for the Site 1 soil Oa1 and Oa2 horizons, respectively; 15353 and 55168 scans for the Site 2 soil Oe and O/A horizons, respectively; and 115534 scans for the Site 3 soil Cf horizon

View larger version (21K): [in a new window]   Fig. 4. Cross-polarization, magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) spectra of the humin fractions from Site 1 soil (Oa1 and Oa2 horizons), Site 2 soil (Oe and O/A horizons), and Site 3 soil (Cf horizon). 150917 and 61612 scans for the Site 1 soil Oa1 and Oa2 horizons, respectively; 18825 and 80194 scans for the Site 2 Soil Oe and O/A horizons, respectively; and 199912 scans for the Site 3 Cf horizon