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• W2180183316 endingPage "453" @default.
• W2180183316 startingPage "443" @default.
• W2180183316 abstract "The lowering of the water table resulting from peatland drainage may dramatically alter C and N cycling in peatland ecosystems, which contain one-third of the total terrestrial C. In this study, tree annual ring width and C (δ13C) and N (δ15N) isotope ratios in soil and plant tissues (tree foliage, growth rings, and understory foliage) in a black spruce−tamarack (Picea mariana−Larix laricina) mixed-wood forest were examined to study the effects of drainage on tree growth and C and N dynamics in a minerotrophic peatland in west-central Alberta, Canada. Drainage increased the δ15N of soil NH4+ from a range of +0.6‰ to +2.9‰ to a range of +4.6‰ to +7.0‰ most likely through increased nitrification following enhanced mineralization. Plant uptake of 15N-enriched NH4+ in the drained treatment resulted in higher plant δ15N (+0.8‰ to +1.8‰ in the drained plots and −3.9‰ to −5.4‰ in the undrained plots), and deposition of litterfall N enriched with 15N increased the δ15N of total soil N in the surface layer in the drained (+2.9‰) as compared with that in the undrained plots (+0.6‰). The effect of drainage on foliar δ13C was species-specific, i.e., only tamarack showed a considerably less negative foliar δ13C in the drained (−28.1‰) than in the undrained plots (−29.1‰), indicating improved water use efficiency (WUE) by drainage. Tree ring area increments were significantly increased following drainage, and δ13C and δ15N in tree growth rings of both species showed responses to drainage retrospectively. Tree-ring δ13C data suggested that drainage improved WUE of both species, with a greater and more prolonged response in tamarack than in black spruce. Our results indicate that drainage caused the studied minerotrophic peatland to become a more open ecosystem in terms of C and N cycling and loss. The effects of forested peatland drainage or drying on C and N balances deserve further research in order to better understand their roles in future global change." @default.
• W2180183316 created "2016-06-24" @default.
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• W2180183316 creator A5057781086 @default.
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• W2180183316 date "2007-02-01" @default.
• W2180183316 modified "2023-10-16" @default.
• W2180183316 title "DRAINAGE AFFECTS TREE GROWTH AND C AND N DYNAMICS IN A MINEROTROPHIC PEATLAND" @default.
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• W2180183316 doi "https://doi.org/10.1890/0012-9658(2007)88[443:datgac]2.0.co;2" @default.
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