Details
| Original language | English |
|---|---|
| Pages (from-to) | 31-41 |
| Number of pages | 11 |
| Journal | Environment international |
| Volume | 20 |
| Issue number | 1 |
| Publication status | Published - 1994 |
| Externally published | Yes |
Abstract
Fluxes and composition of dissolved organic matter (DOM) were compared at three differently acid-loaded podzolic forest soils in the Fichtelgebirge, Bavaria, Germany. DOC fluxes are highest in all compartments at the Hohe Matzen site, which receives the highest amounts of acid deposition. At this site, the pronounced DOM mobilization in the forest floor (31.7 kmol C ha-1 y-1) goes along with a net Ntot and SO42- release, thus indicating humus disintegration. Structural chemical investigations suggest that DOM mobilization in the forest floor is mainly controlled by microbial activity. The high N deposition at Hohe Matzen (2.3 kmol Ntot ha-1 y-1) generally stimulates microbial activity as shown by the elevated mobilization of microbial carbohydrates. From CuO oxidation data and field-ionization mass spectra, it is hypothesized that a second effect of the high N loadings is the retardation of ligninolysis by white-rot fungi and the accumulation of soft-rot degradation products. The latter have been shown in the literature to react with organic N-compounds and to be highly water-soluble. In the mineral soil, DOM is retained mainly by sorption and precipitation processes. Most important for an effective DOM retention are high contents of pedogenic Fe and Al oxides/hydroxides. According to pyrolysis data, high molecular compounds are selectively retained in the B horizons. Blockade of sorption sites by formerly adsorbed DOM and SO42- can reduce sorption capacity for DOM. At the Hohe Matzen site, the Bh horizon grows downwards the profile due to progressive saturation of the sorption sites by DOM and SO42-, and due to depletion of pedogenic Fe and Al by buffering processes. The reduced DOM retention is also expressed by the breakthrough of high molecular compounds at Hohe Matzen.
ASJC Scopus subject areas
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Environment international, Vol. 20, No. 1, 1994, p. 31-41.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Acidification effects on dissolved organic matter mobility in spruce forest ecosystems
AU - Guggenberger, Georg
PY - 1994
Y1 - 1994
N2 - Fluxes and composition of dissolved organic matter (DOM) were compared at three differently acid-loaded podzolic forest soils in the Fichtelgebirge, Bavaria, Germany. DOC fluxes are highest in all compartments at the Hohe Matzen site, which receives the highest amounts of acid deposition. At this site, the pronounced DOM mobilization in the forest floor (31.7 kmol C ha-1 y-1) goes along with a net Ntot and SO42- release, thus indicating humus disintegration. Structural chemical investigations suggest that DOM mobilization in the forest floor is mainly controlled by microbial activity. The high N deposition at Hohe Matzen (2.3 kmol Ntot ha-1 y-1) generally stimulates microbial activity as shown by the elevated mobilization of microbial carbohydrates. From CuO oxidation data and field-ionization mass spectra, it is hypothesized that a second effect of the high N loadings is the retardation of ligninolysis by white-rot fungi and the accumulation of soft-rot degradation products. The latter have been shown in the literature to react with organic N-compounds and to be highly water-soluble. In the mineral soil, DOM is retained mainly by sorption and precipitation processes. Most important for an effective DOM retention are high contents of pedogenic Fe and Al oxides/hydroxides. According to pyrolysis data, high molecular compounds are selectively retained in the B horizons. Blockade of sorption sites by formerly adsorbed DOM and SO42- can reduce sorption capacity for DOM. At the Hohe Matzen site, the Bh horizon grows downwards the profile due to progressive saturation of the sorption sites by DOM and SO42-, and due to depletion of pedogenic Fe and Al by buffering processes. The reduced DOM retention is also expressed by the breakthrough of high molecular compounds at Hohe Matzen.
AB - Fluxes and composition of dissolved organic matter (DOM) were compared at three differently acid-loaded podzolic forest soils in the Fichtelgebirge, Bavaria, Germany. DOC fluxes are highest in all compartments at the Hohe Matzen site, which receives the highest amounts of acid deposition. At this site, the pronounced DOM mobilization in the forest floor (31.7 kmol C ha-1 y-1) goes along with a net Ntot and SO42- release, thus indicating humus disintegration. Structural chemical investigations suggest that DOM mobilization in the forest floor is mainly controlled by microbial activity. The high N deposition at Hohe Matzen (2.3 kmol Ntot ha-1 y-1) generally stimulates microbial activity as shown by the elevated mobilization of microbial carbohydrates. From CuO oxidation data and field-ionization mass spectra, it is hypothesized that a second effect of the high N loadings is the retardation of ligninolysis by white-rot fungi and the accumulation of soft-rot degradation products. The latter have been shown in the literature to react with organic N-compounds and to be highly water-soluble. In the mineral soil, DOM is retained mainly by sorption and precipitation processes. Most important for an effective DOM retention are high contents of pedogenic Fe and Al oxides/hydroxides. According to pyrolysis data, high molecular compounds are selectively retained in the B horizons. Blockade of sorption sites by formerly adsorbed DOM and SO42- can reduce sorption capacity for DOM. At the Hohe Matzen site, the Bh horizon grows downwards the profile due to progressive saturation of the sorption sites by DOM and SO42-, and due to depletion of pedogenic Fe and Al by buffering processes. The reduced DOM retention is also expressed by the breakthrough of high molecular compounds at Hohe Matzen.
UR - http://www.scopus.com/inward/record.url?scp=0028182050&partnerID=8YFLogxK
U2 - 10.1016/0160-4120(94)90064-7
DO - 10.1016/0160-4120(94)90064-7
M3 - Article
AN - SCOPUS:0028182050
VL - 20
SP - 31
EP - 41
JO - Environment international
JF - Environment international
SN - 0160-4120
IS - 1
ER -