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- W1966297515 abstract "Abstract Subtropical ecosystems are often characterized by high N cycling rates, but net nitrification rates are often low in subtropical acid soils. NO 3 − -N immobilization into organic N may be a contributing factor to understand the observed low net nitrification rates in these acid soils. The effects of Fe oxide and organic matter on soil N transformations were evaluated using a 15 N tracing study. Soil net nitrification was low for highly acidic yellow soil (Ferralsols), but gross ammonia oxidation was 7 times higher than net nitrification. In weakly acidic purple soil (Cambisols), net nitrification was 8 times higher than in Ferralsols. The addition of 5% Fe oxide to Cambisols, reduced the net nitrification rate to a negative rate, while NO 3 − -N immobilization rate increased 8 fold. NO 3 − -N immobilization was also observed in Ferralsols which contained high Fe oxides levels. A possible mechanism for these reactions could be stimulation of NO 3 − -N immobilization by Fe oxide which promoted the abiotic formation of nitrogenous polymers, suggesting that the absence of net nitrification in some highly acid soils may be due to high rates of NO 3 − -N immobilization caused by high Fe oxide content rather than a low pH." @default.
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- W1966297515 date "2015-02-27" @default.
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- W1966297515 title "Effects of Fe oxide on N transformations in subtropical acid soils" @default.
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- W1966297515 doi "https://doi.org/10.1038/srep08615" @default.
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