The Effect of Starch Amendment on Nitrogen Mineralisation from the Forest Floor Beneath a Range of Conifers |
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Authors: | HARMER RALPH; ALEXANDER IAN |
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Institution: | Department of Plant Science, University of Aberdeen St Machar Drive, Aberdeen AB9 2UD |
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Abstract: | Samples of LFH collected beneath the canopies of 16 coniferousspecies growing at the same site were incubated in the laboratorywith or without a starch amendment. Exchangeable nitrogen presentranged from 10.5256 and 11.4512 µgg1organic matter for freshly collected and unamended incubationsrespectively. When starch was added material from 11 speciesshowed significantly greater accumulation of mineral nitrogenwith increases ranging from ca 201370 per cent. Nitrificationwas negligible except in Thuja plicata where nitrate constituted68 or 83 per cent of the mineral nitrogen present after incubationwithout or with starch respectively. Starch addition increasedrates of net nitrogen mineralisation in LFH material from Piceasitchensis over a range of growth rates. Rates were greatestin material from the most productive stands whether or not starchwas added. The results are discussed with reference to the factorscontrolling litter decomposition and nitrogen mineralisationin the forest floor. |
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