BradleyKimminsMartin2001

Référence

Bradley, R.L., Kimmins, J.P. and Martin, W.L. (2001) Post-clearcutting chronosequence in the B.C. Coastal Western Hemlock Zone: II. Tracking the assart flush. Journal of Sustainable Forestry, 14(1):23-44.

Résumé

A chronosequence study was undertaken to determine the period of maximum soil mineral-N availability and NO3- Movement following clearcutting in a Pacific silver fir (Abies amabilis [Dougl.] Forbes)-western hemlock (Tsuga heterophylla [Raf.] Sarg.) dominated ecosystem on southern Vancouver Island. In situ buried soil bag incubations, ion exchange resin (IER) bags, and lysimeters were the methods used, over a two-year period, to detect mineral-N and dissolved organic-N (DON) fluxes in a 400-year-old stand as well as in four clearcut sites ranging between 3 and 28 years in age. In an uncut old forest, mineralizable-N in buried bags was highest among sites in early summer, but extremely low in early fall. Clearcut sites sustained relatively high N-mineralization rates throughout the growing season, with the highest rate occurring on the 4-year-old site and lower rates occurring in the older clearcuts. Net NO3- Consumption occurred on all sites in early summer and relatively low rates of nitrification were observed in the fall. Mineral-N accretion on IERs was highest in the 5-year-old clearcut and most of this N was in the NO3- Form, probably as a result of the anion's relative mobility and the higher soil moisture content on the younger clearcut. Solution concentrations of dissolved-N collected in zero-tension lysimeters beneath the forest floor and in tension ( - 33 cbar) lysimeters at 60 cm depth in the mineral soil were generally < 0.10 ppm for NO3-, < 0.20 ppm for NH4+ and < 1.0 ppm for DON. Concentrations of NO3- collected at 60 cm depth peaked during the 3-to-5 year period following clearcutting. Differences in net ammonification and net nitrification rates are discussed in terms of factors controlling the production and consumption of NH4+ and NO3-, most notably the availability of reduced C following clearcutting. Absolute height increments of advance regeneration Pacific silver fir increased exponentially during the first five years after clearcutting, remained unchanged for the next four years, and gradually decreased for the next three years. The concentration of N in current-year Pacific silver fir needles from the 4-year-old clearcut (1.22%) was approximately 50% higher than in those from the 7-year-old (0.88%) and 11-year-old (0.83%) clearcuts. Results suggested that maximum mineral-N availability and potential NO3- leaching both occurred at 4-to-5 years after clearcutting, and that regenerating Pacific silver fir seedlings competed with nitrophilous early-seral species in capturing some of this N.

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@ARTICLE { BradleyKimminsMartin2001,
    AUTHOR = { Bradley, R.L. and Kimmins, J.P. and Martin, W.L. },
    TITLE = { Post-clearcutting chronosequence in the B.C. Coastal Western Hemlock Zone: II. Tracking the assart flush },
    JOURNAL = { Journal of Sustainable Forestry },
    YEAR = { 2001 },
    VOLUME = { 14 },
    PAGES = { 23-44 },
    NUMBER = { 1 },
    NOTE = { 10549811 (ISSN) Cited By (since 1996): 6 Export Date: 26 April 2007 Source: Scopus Language of Original Document: English Correspondence Address: Bradley, R.L.; Departement of de Biologie; Universite de Sherbrooke Sherbrooke, Quebec J1K 2R1, Canada; email: robert.bradley@courrier.usherb.ca References: Aber, J.D., Botkin, D.B., Melillo, J.M., Predicting the effects of different harvesting on forest floor dynamics in northern hardwoods (1978) Can. J. For. Res, 8, pp. 306-315; Aber, J.D., Melillo, J.M., Federer, C.A., Predicting the effects of rotation length, harvest intensity and fertilization on fiber yield from northern hardwood forests in New England (1982) For. Sci, 28, pp. 31-45; Binkley, D., Matson, P., Ion exchange bag method for assessing forest soil nitrogen availability (1983) Soil Sci. Soc. Am. J, 47, pp. 1050-1052; Bradley, R.L., Fyles, J.W., Interactions between tree seedling roots and humus forms in the control of soil C and N cycling (1996) Biol. Fertil. 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    ABSTRACT = { A chronosequence study was undertaken to determine the period of maximum soil mineral-N availability and NO3- Movement following clearcutting in a Pacific silver fir (Abies amabilis [Dougl.] Forbes)-western hemlock (Tsuga heterophylla [Raf.] Sarg.) dominated ecosystem on southern Vancouver Island. In situ buried soil bag incubations, ion exchange resin (IER) bags, and lysimeters were the methods used, over a two-year period, to detect mineral-N and dissolved organic-N (DON) fluxes in a 400-year-old stand as well as in four clearcut sites ranging between 3 and 28 years in age. In an uncut old forest, mineralizable-N in buried bags was highest among sites in early summer, but extremely low in early fall. Clearcut sites sustained relatively high N-mineralization rates throughout the growing season, with the highest rate occurring on the 4-year-old site and lower rates occurring in the older clearcuts. Net NO3- Consumption occurred on all sites in early summer and relatively low rates of nitrification were observed in the fall. Mineral-N accretion on IERs was highest in the 5-year-old clearcut and most of this N was in the NO3- Form, probably as a result of the anion's relative mobility and the higher soil moisture content on the younger clearcut. Solution concentrations of dissolved-N collected in zero-tension lysimeters beneath the forest floor and in tension ( - 33 cbar) lysimeters at 60 cm depth in the mineral soil were generally < 0.10 ppm for NO3-, < 0.20 ppm for NH4+ and < 1.0 ppm for DON. Concentrations of NO3- collected at 60 cm depth peaked during the 3-to-5 year period following clearcutting. Differences in net ammonification and net nitrification rates are discussed in terms of factors controlling the production and consumption of NH4+ and NO3-, most notably the availability of reduced C following clearcutting. Absolute height increments of advance regeneration Pacific silver fir increased exponentially during the first five years after clearcutting, remained unchanged for the next four years, and gradually decreased for the next three years. The concentration of N in current-year Pacific silver fir needles from the 4-year-old clearcut (1.22%) was approximately 50% higher than in those from the 7-year-old (0.88%) and 11-year-old (0.83%) clearcuts. Results suggested that maximum mineral-N availability and potential NO3- leaching both occurred at 4-to-5 years after clearcutting, and that regenerating Pacific silver fir seedlings competed with nitrophilous early-seral species in capturing some of this N. },
    KEYWORDS = { Buricd bags Chronosequence Clearcutting Forest floor nitrogen Ion exchange resins Lysimetry Ammonia Coastal zones Ecosystems Ion exchange resins Lysimeters Moisture Nitrogen Nitrogen oxides Soils Mineralization Forestry chronosequence clearcutting forest floor Canada },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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