Record details

    Similarity between C, N and S stable isotope profiles in European spruce forest soils: implications for the use of delta34S a tracer
Statement of responsibility
    Martin Novák, František Buzek, Anthony F. Harrison, Iva Jačková, Daniela Fottová
    Bůzek, František
    Fottová, Daniela, 1951-
    Harrison, Anthony F.
    Jačková, Iva
    Novák, Martin, 1959-
    Přechová, Eva
Source title - serial
    Applied geochemistry
    Vol. 18, no. 5
    p. 765-779
    6 obr., 8 tab., 3 s. bibl.
    Zkr. název ser.: Appl. Geochem.
Subject group
    cyklus geochemický
    izotopy C
    izotopy N
    izotopy S
    izotopy stabilní
    malé povodí
    profil geochemický
    profil půdní
Geographical name
    Itálie střední
    Jezeří (Most, Litvínov)
    Načetín (Chomutov)
Abstract (in english)
   table isotope systematics of C, N and S were studied in soils of 5 European forest ecosystems. The sites were located along a North-South transect from Sweden to Italy (mean annual temperatures from +1.0 to +8.5 °C, atmospheric deposition from 2 to 19 kg N ha-1 a-1, and from 6 to 42 kg S ha-1 a-1). In Picea stands, the behavior of C, N and S isotopes was similar in 3 aspects: (1) assimilation favored the lighter isotopes 12C, 14N and 32S; (2) mineralization in the soil profile left in situ residues enriched in the heavier isotopes I3C, 15N and 34S; and (3) NO3-N as well as SO4-S in soil solution was isotopically lighter compared to the same species in the atmospheric input. In this study, emphasis was placed on S isotope profiles which so far have been investigated to a much lesser extent than those of C and N. Sulfate in monthly samples of atmospheric input had systematically higher delta34S ratios than total soil S at the 0-5 cm depth, on average by 4.0 promile.
   Sulfate in the atmospheric input had higher delta34S ratios than in deep ( 50 cm) lysimeter water, on average by 3.2 promile. Organic S constituted more than 50 procent of total soil S throughout most of the profiles (0-20 cm below surface). There was a tendency to isotopically heavier organic S and lighter inorganic S04-S, with ester S04-S heavier than C-bonded S at 3 of the 5 sites. With an increasing depth (0 to 20 cm below surface), delta13C, delta15N and delta34S ratios of bulk soil increased on average by 0.9, 4.2 and 1.6 promile, respectively, reflecting an increasing degree of mineralization of organic matter. The isotope effects of C, N and S mineralization were robust enough to exist at a variety of climate conditions and pollution levels.
   In the case of S, the difference between isotope composition of the upper organic-rich soil horizon (lower delta34S) and the deeper sesquioxide-rich soil horizons (higher delta34S) can be used to determine the source of SO4 in streams draining forests. This application of delta34S as a tracer of S origin was developed in the Jezeří catchment, Czech Republic, a highly polluted site suffering from spruce die-back. In 1996-1997, the magnitude and delta34S of atmospheric input (20 kg S ha-1 a-1, 5.8 promile) and stream discharge (56 kg S ha-1 a-1, 3.5 promile) was monitored. Export of S from the catchment was 3 times higher than contemporary atmospheric input. More than 50 procent of S in the discharge was represented by release of previously stored pollutant S from the soil.
   Stable isotope systematics of Jezeří soil S (mean of 2.5 promile in the O + A horizon, 4.8 promile in the B horizon, and 5.8 promile in the bedrock) suggests that most of the soil-derived S in discharge must come from the isotopically light organic S present in the upper soil horizon, and that mineralized organically-cycled S is mainly flushed out during the spring snowmelt. The fact that a considerable proportion of incoming S is organically cycled should
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    25. 3. 2008
Import date
    8. 8. 2012