Soil Carbon and Nitrogen Fractions of a Grassland in Central Missouri,USA |
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| Authors: | Shade J Akinsete Nsalambi V Nkongolo |
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| Institution: | 1. Department of Environmental Health Sciences, Faculty of Public Health, College of Medicine, University of Ibadan, Ibadan, Oyo State, Nigeria;2. Center of Excellence for Geospatial Information Sciences, Department of Agriculture and Environmental Science, Lincoln University, Jefferson City, Missouri, USA |
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| Abstract: | Quantification of soil carbon (C) and nitrogen (N) fractions in grasslands is vital for estimating C sequestration and climate change studies. We quantified background soil total carbon (TOC) status, recalcitrant carbon (RC), acid hydrolysable labile carbon (AHC), hot- and cold-water extractable carbon (HWC and CWC, respectively) fractions in the grassland in this study. Soil C fractions were as follows: TOC (11,633 to 15,525 mg C kg?1); RC (11,500 to 15,357 mg C kg?1); AHC (132 to 168 mg C kg?1); HWC (57 to 70 mg C kg?1); and CWC (27 to 33 mg C kg?1). Labile C fractions contributed at most 1.2% to total C. Concentrations of total N ranged from 1072 to 1230 g N kg?1. Recalcitrant C contributed higher amounts (>90%) to total C, indicating the incorporation of C into the stable C fraction. Carbon dioxide (CO2) and nitrous oxide (N2O) fluxes were not significantly correlated with total C. |
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| Keywords: | Grassland greenhouse gases labile carbon recalcitrant carbon soil carbon |
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