Bradley2002

Référence

Bradley, R.L. (2002) Dynamics of nitrogen associated to acid insoluble substances derived from plant litter. Communications in Soil Science and Plant Analysis, 33(7-8):1277-1290.

Résumé

A study was conducted on three 15N-labeled litter types (i.e., straw, stripe maple, and American beech) to determine the effects of three years incubation and NH4+-N amendments [10% of total nitrogen (N)] on acid insoluble substances (AIS), and on the N content of AIS (i.e., AIS-N). Based on C:N ratios, all litter types lost considerable mass after three years incubation, however, AIS concentrations increased in only two of the litter types. This suggests that AIS of different litter types decomposed at different rates. The NH4+-N amendments followed by a 21-day conditioning period did not affect AIS concentrations. The AIS-N concentration of fresh litters were much higher than expected suggesting much more diverse substrates than lignin only. Three years incubation significantly increased AIS-N concentrations of all litter types, probably the result of recalcitrant microbial by-products that accumulated during decomposition. The NH4+-N amendments significantly increased AIS-N concentrations of both incubated and non-incubated litters after 21 days conditioning, and these increases corresponded to 20%-69% of added NH4+-N. Analyses of changes in AIS-15N pools revealed, however, that only a small portion of the added NH4+-N was actually transferred to the AIS-N pool. Therefore, the increase in the AIS-N pool due to the addition of NH4+-N solution was the result of pool substitution or displacement reactions between the added NH4+-N and other non-AIS N pools. We conclude that AIS-N pools can be subdivided into classes of compounds according to origin and stability.

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@ARTICLE { Bradley2002,
    AUTHOR = { Bradley, R.L. },
    TITLE = { Dynamics of nitrogen associated to acid insoluble substances derived from plant litter },
    JOURNAL = { Communications in Soil Science and Plant Analysis },
    YEAR = { 2002 },
    VOLUME = { 33 },
    PAGES = { 1277-1290 },
    NUMBER = { 7-8 },
    NOTE = { 00103624 (ISSN) Cited By (since 1996): 1 Export Date: 26 April 2007 Source: Scopus CODEN: CSOSA doi: 10.1081/CSS-120003887 Language of Original Document: English Correspondence Address: Bradley, R.; De?partement de Biologie; Universite? de Sherbrooke Sherbrooke, Que. J1K 2R1, Canada; email: robert.bradley@courrier.usherb.ca References: Schimel, D.S., Emanuel, W., Rizzo, B., Smith, T., Woodward, F.I., Fisher, H., Kittel, T.G.F., Chaney, J., Continental scale variability in ecosystem processes: Models, data, and the role of disturbance (1997) Ecol. Monogr., 67 (2), pp. 251-271; McGill, W.B., Shields, J.S., Paul, E.A., Relation between carbon and nitrogen turnover in soil organic fractions of microbial origin (1975) Soil Biol. Biochem., 7, pp. 57-63; McGill, W.B., Cole, C.V., Comparative aspects of cycling of organic carbon, nitrogen, sulfur, and phosphorus through soil organic matter (1981) Geoderma, 26, pp. 267-286; Magid, J., Gorissen, A., Giller, K.E., In search of the elusive "Active" fraction of soil organic matter: Three size-density fractionation methods for tracing the fate of homogeneously 14C-labelled plant materials (1996) Soil Biol. Biochem., 28 (1), pp. 89-99; Strickland, T.C., Sollins, P., Rudd, N., Schimel, D.S., Rapid stabilization and mobilization of 15N in forest and range soils (1992) Soil Biol. Biochem., 24 (9), pp. 849-855; Stevenson, F.J., Gross chemical fractionation of organic matter (1965) Methods of Soil Analysis. Part 2, pp. 1410-1421. , Black, C.A., Ed.; Americal Society of Agronomy: Madison, WI; Ryan, M.G., Melillo, J.M., Ricca, A., A comparison of methods for determining proximate carbon fractions of forest litter (1990) Can. J. For. Res., 20, pp. 166-171; Preston, C.M., Trofymow, J.A., Sayer, B.G., Niu, J., 13C CPMAS NMR investigation of the proximate analysis fractions used to assess litter quality in decomposition studies (1997) Can. J. Bot., 75 (9), pp. 1601-1613; Berg, B., Hannus, K., Popoff, T., Theander, O., Changes in chemical components of needle litter during decomposition: Long-term decomposition in a scots pine forest. I (1982) Can. J. Bot., 60, pp. 1310-1319; Becker, M., Lahda, J.K., Simpson, I.C., Ottow, J.C.G., Parameters affecting residue nitrogen mineralization in flooded soils (1994) Soil Sci. Soc. Am. J., 58 (6), pp. 1666-1671; Cle?ment, A., Lahda, J.K., Chalifour, F.P., Crop residue effects on nitrogen mineralization, microbial biomass, and rice yields in submerged soils (1995) Soil Sci. Soc. Am. J., 59 (6), pp. 1595-1603; Mtambanengwe, F., Kirchmann, H., Litter from a tropical Savanna woodland (Miombo): Chemical comparison and C and N mineralization (1995) Soil Biol. Biochem., 27 (12), pp. 1639-1651; Paul, E.A., Clark, F.E., (1996) Soil Microbiology and Biochemistry, p. 340. , Academic Press: London, UK; Kuzyakov, Y., Friedel, J.K., Starh, K., Review of mechanisms and quantification of priming effects (2000) Soil Biol. Biochem., 32 (11-12), pp. 1485-1498; He, X.T., Stevenson, F.J., Mulvaney, R.L., Kelley, K.R., Incorporation of newly immobilized 15N into stable organic forms in soil (1988) Soil Biol. Biochem., 20 (1), pp. 75-81; Schimel, J.P., Firestone, M.K., Nitrogen incorporation and flow through a coniferous forest soil profile (1989) Soil Sci. Soc. Am. J., 53, pp. 779-784; Dickson, R.E., Vogelmann, T.C., Larson, P.R., Glutamine transfer from xylem to phloem and translocation to developing leaves from populus deltoides (1985) Plant Physiol., 77, pp. 412-417; Horwath, W.R., Paul, E.A., Pregitzer, K.S., Injection of nitrogen-15 into trees to study nitrogen cycling in soil (1992) Soil Sci. Soc. Am. J., 56, pp. 316-319; Chatarpaul, L., Burgess, D.M., Methen, I.R., Equations for estimating aboveground nutrient content of six eastern Canadian Hardwoods (1985) Info. Rep., , PI-X-55 Canadian Forest Service, Petawawa National Forestry Institute: Petawawa, Ontario, Canada; Wedderburn, M.E., Carter, J., Litter decomposition by four functional tree types for use in silvopastoral systems (1999) Soil Biol. Biochem., 31 (3), pp. 455-461; Pelletier, B., Fyles, J.W., Dutilleul, P., Tree species control and spatial structure of forest floor properties in a mixed-species stand (1999) E?coscience, 6 (1), pp. 79-91; Bradley, R.L., Titus, B.D., Preston, C.P., Changes to mineral N cycling and microbial communities in black spruce humus after additions of (NH4)2SO4 and condensed tannins extracted from Kalmia angustifolia and balsam fir (2000) Soil Biol. Biochem., 32, pp. 1227-1240. },
    ABSTRACT = { A study was conducted on three 15N-labeled litter types (i.e., straw, stripe maple, and American beech) to determine the effects of three years incubation and NH4+-N amendments [10% of total nitrogen (N)] on acid insoluble substances (AIS), and on the N content of AIS (i.e., AIS-N). Based on C:N ratios, all litter types lost considerable mass after three years incubation, however, AIS concentrations increased in only two of the litter types. This suggests that AIS of different litter types decomposed at different rates. The NH4+-N amendments followed by a 21-day conditioning period did not affect AIS concentrations. The AIS-N concentration of fresh litters were much higher than expected suggesting much more diverse substrates than lignin only. Three years incubation significantly increased AIS-N concentrations of all litter types, probably the result of recalcitrant microbial by-products that accumulated during decomposition. The NH4+-N amendments significantly increased AIS-N concentrations of both incubated and non-incubated litters after 21 days conditioning, and these increases corresponded to 20%-69% of added NH4+-N. Analyses of changes in AIS-15N pools revealed, however, that only a small portion of the added NH4+-N was actually transferred to the AIS-N pool. Therefore, the increase in the AIS-N pool due to the addition of NH4+-N solution was the result of pool substitution or displacement reactions between the added NH4+-N and other non-AIS N pools. We conclude that AIS-N pools can be subdivided into classes of compounds according to origin and stability. },
    KEYWORDS = { nitrogen organic matter leaf litter methane nitrogen nutrient dynamics soil amendment plant litter Acer Fagus Fagus grandifolia },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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