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| Titel |
The denitrification properties of soils under three different shelterbelts and in adjoining cultivated fields |
| VerfasserIn |
L. Szajdak, J. Augustin, W. Gaca, T. Meysner, K. Styła |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023275
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| Zusammenfassung |
| The investigations were carried out in Agroecological Landscape Park in Turew
(40 km South-West of Poznań). Intensively agricultural is observed in this region.
Characteristic features of this landscape are shelterbelts created in the XIX century by
general Dezydery Chlapowski. All shelterbelts and adjoining cultivated fields were
introduced on Hapludalfs soils. Three shelterbelts and adjoining cultivated fields were
selected for this experiment. Two of them were created approximately 200 years ago.
The first shelterbelt consists mainly of Robinia pseudoacacia and small admixture
Quercus robur and Quercus petraea. The second one consists of Crataegus monogyna.
The third one – a young shelterbelt was created in 1993 and consists of several
species of plants such as: Quercus petraea and Quercus robur, Larix deciduas, Pinus
sylvestris, Sorbus aucuparia, Sorbus intermedia, Tilia cordata and some other tree
species.
On soils were determinated: activity of nitrate reductase, activity of peroxidase, activity of
urease and activity of xantine oxidase, total iron, Fe+3, Fe+2, total nitrogen, N-NH4+,
N-NO3-, total organic carbon (TOC), dissolved organic carbon (DOC), current N2O, N2 and
CH4 flux rates, and pH (in 1M KCl).
The contents of total organic carbon, dissolved organic carbon, total nitrogen, N-NO3-
and N-NH4+ were higher in the soil under old shelterbelts (Robinia pseudoacacia and
Crataegus monogyna) than under young one. It points out the highest accumulation of
organic matter in soils under two old shelterbelts. The same also applied to the current
N2O and N2 fluxes. Unlike this CH4exchange was just low everywhere. Nitrate
reductase, urease, xantine oxidase and peroxidase activities participates in the cycle of
nitrogen and are sensitive on redox potential in soil. The highest activity of nitrate
reductase and xantine oxidase activity were observed in young shelterbelt. Activity of
urease and activity of peroxidase were higher under two old shelterbelts Robinia
pseudoacacia and Crataegus monogyna than in young one and in adjoining cultivated
fields. The conversion of Fe+2 into Fe+3 plays an important role in redox processes
in soil. Our results have shown that total iron concentrations were higher in soils
under three shelterbelts than in adjoining cultivated fields. It was found that pH
ranged from 3.29 to 5.98 in soils under shelterbelts and in soils cultivated fields
from 4.17 to 6.22. It is one of the factors controlling the rate of denitrification in
soil.
This work was supported by a grant No. N N305 121934 founded by Polish Ministry of
Education. |
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