Effects of starch additions on N turnover in Sitka spruce forest floor |
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| Authors: | Joshua P Schimel Stefan Helfer Ian J Alexander |
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| Institution: | (1) Institute of Arctic Biology, University of Alaska, 99775 Fairbanks, AK, USA;(2) Department of Plant and Soil Science, University of Aberdeen, AB9 2UE Aberdeen, Scotland;(3) Present address: Royal Botanic Garden, EH3 5LR Edinburgh, Scotland |
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| Abstract: | Starch and carboxymethyl starch were added to forest floor samples collected from a sitka spruce stand near Aberdeen, Scotland. Samples were incubated for one month and were periodically analyzed for respiration, biomass-C, net and gross N-mineralization/immobilization. Gross mineralization/immobilization was measured by using a 15N-isotope pool dilution technique. Starch additions did not significantly affect respiration rates or biomass-C but caused net immobilization. The mechanism of this appeared to be inhibition of the decomposition of N-containing soil organic matter by the available starch-C, which resulted in decreased gross mineralization. Carboxymethyl starch acted as a biocide, probably as a result of an osmotic effect. |
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| Keywords: | carbon catabolite repression mineralization N cycling starch |
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