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• W2000278851 abstract "We examined decomposition and nutrient dynamics in fresh litter and net N mineralization in old litter to determine (i) if forest floor is a source of available nutrients in mid-rotation loblolly pine (Pinus taeda L.) stands and (ii) the effect of site preparation and vegetation control on forest floor nutrient dynamics. Four types of fresh litter were decomposed in situ in mesh bags: two containing only pine (differing by history of stand management) and two pine–hardwood mixes (ratios 1:5 and 5:1). Litter bags were recovered every May and October for 26 months. Litter type, in particular the presence and amount of leaves, affected decomposition and nutrient dynamics in fresh litter. After 26 months, all fresh litters lost 55% of mass; decay rate constants were 0.43 (needles) to 0.60 year –1 (leaves). Pine (1) and pine (2) and needles in mix 1:5 immobilized N. Almost all fresh litters also immobilized P. After 26 months of decay, N and P pools suggested an accumulation in the needles of 0.7–2.7 kg N·ha –1 and 0.2–0.5 kg P·ha –1 and mineralization of 1.1–3.7 kg N·ha –1 in mix 5:1 needles and mix 1:5 leaves. All fresh litters mineralized K, Ca, and Mg. Old litter was incubated in situ in capped polyvinyl chloride containers from May to November. Monthly rates of net N mineralization in old litter were determined in KCl extracts of NH 4 + and NO 3 – . Net N mineralization in old litter was 0.75–1.5 kg N·ha –1 per 6 months and was attributed to mineralization in mineral soil. We conclude that forest floors in these stands are not a source of available N or P. Instead, forest floors appear to be sinks for N and probably P." @default.
• W2000278851 created "2016-06-24" @default.
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• W2000278851 date "2001-07-01" @default.
• W2000278851 modified "2023-09-27" @default.
• W2000278851 title "Are forest floors in mid-rotation stands of loblolly pine (<i>Pinus taeda</i>) a sink for nitrogen and phosphorus?" @default.
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• W2000278851 doi "https://doi.org/10.1139/x01-049" @default.
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