Bradley2001

Référence

Bradley, R.L. (2001) An alternative explanation for the post-disturbance NO3- flush in some forest ecosystems. Ecology Letters, 4(5):412-416.

Résumé

The appearance of soil NO3- after forest disturbance is commonly ascribed to a higher availability of NH4+ to autotrophic nitrifiers, or to a reduction in available-C resulting in lower microbial assimilation of NO3-. Alternatively, it has been proposed that increasing NH4+ pools following disturbance could increase net nitrification by reducing microbial assimilation of NO3-. Forest floor material was collected from shelterwood harvest plots which displayed both low available-C and low NH4+ pools, and where previous experiments had suggested the prevalence of heterotrophic nitrification. Subsamples were amended with incremental rates of glucose-C or NH4+, and gross NO3- transformation rates were measured by isotope dilution. Glucose-C additions had little effect on the net difference between gross NO3- production and consumption rates. On the other hand, NH4+ additions caused gross NO3- consumption processes to decrease sharply, while gross NO3- production processes remained constant. The results suggest that NH4+ can have an immediate positive effect on net nitrification rates by suppressing NO3- assimilation and uptake systems.

Format EndNote

Vous pouvez importer cette référence dans EndNote.

Format BibTeX-CSV

Vous pouvez importer cette référence en format BibTeX-CSV.

Format BibTeX

Vous pouvez copier l'entrée BibTeX de cette référence ci-bas, ou l'importer directement dans un logiciel tel que JabRef .

@ARTICLE { Bradley2001,
    AUTHOR = { Bradley, R.L. },
    TITLE = { An alternative explanation for the post-disturbance NO3- flush in some forest ecosystems },
    JOURNAL = { Ecology Letters },
    YEAR = { 2001 },
    VOLUME = { 4 },
    PAGES = { 412-416 },
    NUMBER = { 5 },
    NOTE = { 1461023X (ISSN) Cited By (since 1996): 9 Export Date: 26 April 2007 Source: Scopus CODEN: ECLEF doi: 10.1046/j.1461-0248.2001.00243.x Language of Original Document: English Correspondence Address: Bradley, R.L.; De?partement de Biologie; Faculte? des Sciences; Universit de Sherbrooke Sherbrooke, Que. J1K 2R1, Canada; email: robert.bradley@courrier.usherb.ca References: Bradley, R.L., Fyles, J.W., A kinetic parameter describing soil available carbon and its relationship to rate increase in C mineralisation (1995) Soil Biol. Biochem., 27, pp. 167-172; Bradley, R.L., Fyles, J.W., Method to avoid isotope discrimination during the diffusion of NH4+ from 15N-labelled soil extracts (1996) Soil Biol. Biochem., 28, pp. 895-897; 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. Soils, 23, pp. 70-79; Bradley, R.L., Titus, B.D., Hogg, K., Does shelterwood harvesting have less impact on forest floor nutrient availability and microbial properties than clearcutting? (2001) Biol. Fertil. Soils, , in press; Bradley, R.L., Titus, B.D., Hogg, K., Preston, C., Prescott, C.E., Kimmins, J.P., Assessing the controls on soil mineral-N cycling rates in managed coastal western hemlock ecosystems of British Columbia (2000) J. Sustain. Forest., 10, pp. 213-219; Davidson, E.A., Hackler, J.L., Soil heterogeneity can mask the effects of ammonium availability on nitrification (1994) Soil Biol. Biochem., 26, pp. 1449-1453; Davidson, E.A., Hart, S.C., Firestone, M.K., Internal cycling of nitrate in soils of a mature coniferous forest (1992) Ecology, 73, pp. 1148-1156; Hart, S.C., Nason, G.E., Myrold, D.D., Perry, D.A., Dynamics of gross nitrogen transformations in an old-growth forest: The carbon connection (1994) Ecology, 75, pp. 880-891; Hart, S.C., Stark, J.M., Davidson, E.A., Firestone, M.K., Nitrogen mineralization, immobilization, and nitrification (1994) Methods of Soil Analyses - Part 2, pp. 985-1018. , ed. Weaver, R.W. Madison: Soil Science Society of America; Jones, J.M., Richards, B.N., Effect of reforestation on turnover of 15N-labelled nitrate and ammonium in relation to changes in soil microflora (1977) Soil Biol. Biochem., 9, pp. 383-392; Kirk, T.K., Fenn, P., Formation and action of the ligninolytic system in basidiomycetes (1982) Br. Mycol. Soc., 4, pp. 67-89; Kirkham, D., Bartholemew, W.V., Equations for following nutrient transformation in soil, utilizing tracer data (1954) Soil Sci. Soc. Am. J., 18, pp. 33-34; Kronzucker, H.J., Siddiqi, M.Y., Glass, A.D.M., Conifer root discrimination against soil nitrate and the ecology of forest succession (1997) Nature, 385, pp. 59-61; Likens, G.E., Bormann, F.H., Johnson, N.M., Fisher, D.W., Pierce, R.S., Effects of clearcutting and herbicide treatment on nutrient budgets in the Hubbard Brook watershed-ecosystem (1970) Ecol. Monogr., 40, pp. 23-47; Lin, J.T., Stewart, V., Nitrate assimilation by bacteria (1998) Adv. Microbial Physiol., 39, pp. 1-30; Paavolainen, L., Smolander, A., Nitrification and denitrification in soil from a clearcut Norway spruce (Picea abies) stand (1998) Soil Biol. Biochem., 30, pp. 775-781; Papen, H., Vonberg, R., A most probable number method (Mpn) for the estimation of cell numbers of heterotrophic nitrifying bacteria in soil (1998) Plant Soil, 199, pp. 123-130; Paul, E.A., Clarke, F.E., (1996) Soil Microbiology and Biochemistry, 2nd edn., , London: Academic Press; (1999) SYSTAT® 9 Statistics II, , Chicago: SPSS Inc; Stark, J.M., Hart, S.C., High rates of nitrification and nitrate turnover in undisturbed coniferous forests (1997) Nature, 385, pp. 61-64; Ste-Marie, C., Pare?, D., Soil, pH and N availability effects on net nitrification in the forest floors of a range of boreal forest stands (1999) Soil Biol. Biochem., 31, pp. 1579-1589; Stevens, P.A., Norris, D.A., Williams, T.G., Hughes, S., Durrant, D.W.H., Anderson, M.A., Weatherley, N.S., Woods, C., Nutrient losses after clearfelling in Beddgelert Forest - A comparison of the effects of conventional and whole-tree harvest on soil water chemistry (1995) Forestry, 68, pp. 115-131. },
    ABSTRACT = { The appearance of soil NO3- after forest disturbance is commonly ascribed to a higher availability of NH4+ to autotrophic nitrifiers, or to a reduction in available-C resulting in lower microbial assimilation of NO3-. Alternatively, it has been proposed that increasing NH4+ pools following disturbance could increase net nitrification by reducing microbial assimilation of NO3-. Forest floor material was collected from shelterwood harvest plots which displayed both low available-C and low NH4+ pools, and where previous experiments had suggested the prevalence of heterotrophic nitrification. Subsamples were amended with incremental rates of glucose-C or NH4+, and gross NO3- transformation rates were measured by isotope dilution. Glucose-C additions had little effect on the net difference between gross NO3- production and consumption rates. On the other hand, NH4+ additions caused gross NO3- consumption processes to decrease sharply, while gross NO3- production processes remained constant. The results suggest that NH4+ can have an immediate positive effect on net nitrification rates by suppressing NO3- assimilation and uptake systems. },
    KEYWORDS = { Available-C Forest ecosystems NH4+ Post-disturbance Soil NO3- flush disturbance forest ecosystem forest floor nitrification soil microorganism },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

********************************************************** *************************** FRQNT ************************ **********************************************************

Un regroupement stratégique du

********************************************************** ***************** Facebook Twitter *********************** **********************************************************

Abonnez-vous à
l'Infolettre du CEF!

********************************************************** ***************** Pub - ABC CBA 2020 ****************** **********************************************************

31 mai au 4 juin 2020

********************************************************** ***************** Pub - Symphonies_Boreales ****************** **********************************************************

********************************************************** ***************** Boîte à trucs *************** **********************************************************

CEF-Référence
La référence vedette !

Jérémie Alluard (2016) Les statistiques au moments de la rédaction 

  • Ce document a pour but de guider les étudiants à intégrer de manière appropriée une analyse statistique dans leur rapport de recherche.

Voir les autres...