Assessing the Reliability of Permanganate-Oxidizable Carbon as an Index of Soil Labile Carbon

Effects of contrasting soil management regimes on total and labile soil organic carbon fractions in a loess soil in China

“…This is consistent with observations by Blair et al (2006) and Rudrappa et al (2006). Similar concentrations of KMnO 4 C following manure and straw amendments have also been reported under wheat-maize and rice-wheat systems by Verma et al (2010), and are probably related to the similar amounts of lignin supplied in the SNPK and MNPK treatments because the KMnO 4 C content of organic materials (straw and manure) do not correlate with their total C contents but significantly correlate with their lignin contents (Tirol-Padre and Ladha, 2004). In addition, Blair et al (2006) observed similar KMnO 4 C contents in chemically fertilized and unfertilized soils.…”

Permanganate Oxidizable Carbon Reflects a Processed Soil Fraction that is Sensitive to Management

“…Th e relationship between POXC and SOC was generally stronger than POXC with other soil C fractions in nearly every study. A strong positive relationship between POXC and SOC has been reported previously (Weil et al, 2003;Tirol-Padre and Ladha, 2004;Wuest et al, 2006;Jokela et al, 2009). Th e relationship may be stronger due to similar methodologies of POXC and SOC, as SOC relies on complete oxidation of all soil C, while POXC relies on partial oxidation of the C pool.…”

Potential of fallow chronosequence in shifting cultivation to conserve soil organic carbon in northeast India

“…1). The active pools include living biomass, fine particles of detritus, polysaccharides and non-humic substances of shorter residence time (Tirol-Padre and Ladha, 2004). Spontaneous growth of secondary forest in shifting cultivation under subtropical climate might add fresh plant residues to soil to maintain higher proportion of the SOC in the active pools.…”