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• W2018408342 abstract "Effects of physical protection of soil organic matter (SOM) on rates of nitrogen (N) mineralization and immobilization were studied in five soils of contrasting mineralogy and physical structure from North and Central America. Whole soils were exposed for 60 days to 15N NH4C1, then separated into a heavy and a light density fraction (≷ 1.70 Mg m−3). Substantial 15N was incorporated into the denser (heavy) fraction of each soil during the 60-day exposure indicating that organo-mineral complexes can form quite quickly. Next, sonicated and unsonicated heavy fraction (HF) material was slurry incubated for 5 days. (The effect of sonication was used as an operational measure of the degree of physical protection.) Most of the newly-formed organic N was non-labile. However, some 14N and 15N were released into solution during the slurry incubation, mainly as dissolved organic N (DON). NH+4 was also released and was more highly labelled than the DON, suggesting that the NH+4 was derived from a more active pool. We expected that the degree of labelling of the NH+4 and DON released during incubation would be lower for sonicated than for unsonicated HFs because the label would be diluted by release of physically-protected native 14N. In fact, sonication had no effect on release of 14NH+4 or 15NH+4 during the slurry incubation but markedly increased release of 14N and 15N as DON. In addition, sonication increased the degree of labelling of the NH+4 and perhaps of the DON. Overall these results suggest that some 15N was incorporated into the HFs as an active but protected (“active-protected”) fraction. Only a small portion of this active-protected fraction was chloroform-labile suggesting that it was not microbial biomass." @default.
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• W2018408342 date "1992-09-01" @default.
• W2018408342 modified "2023-09-27" @default.
• W2018408342 title "Rapid stabilization and mobilization of 15N in forest and range soils" @default.
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• W2018408342 doi "https://doi.org/10.1016/0038-0717(92)90005-i" @default.
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