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| Titel |
The changes of nitrate reductase activity in soils under Robinia pseudoacacia shelterbelt and in adjoining cultivated field |
| VerfasserIn |
Lech Wojciech Szajdak, Wioletta Gaca |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034907
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| Zusammenfassung |
| The investigations were carried out in Dezydery Chlapowski Agroecological Landscape Park
in Turew (40 km South-West of Poznań, West Polish Lowlands, 16Ë 45 E and 52Ë 01
N). Intensively agriculture is observed in this region. Characteristic features of
this landscape are shelterbelts created in the XIX century by the general Dezydery
Chlapowski.
Soil samples were taken from Robinia pseudoacacia shelterbelt and from adjoining
cultivated field. This is 200 - years old shelterbelt consists mainly of Robinia pseudacacia
and small admixture of Quercus robur and Quercus petraea. It is 2 kilometers length and 36
meters width. Shelterbelts and adjoining cultivated fields were introduced on Hapludalfs soils
(according to FAO classification).
The aim of this study was to evaluate the effect of moisture and nitrogen concentrations
on the changes of nitrate reductase activity in soil under shelterbelt and in adjoining
cultivated field. The experiments were carried out in two different moisture content. The first
was field-moist and the second was 15% moisture content. In this study three different
contents of nitrogen in the form of urea (organic form of nitrogen) were investigated: field
concentration, after addition of 0.25% and 0.5% of nitrogen. Activity of nitrate reductase
changes in different interval of time were measured. Rate constant of reactions was calculated
for the changes of nitrate reductase activity. Our results have shown that this process runs
according to the equation rate of first–order kinetic reaction model. The first-order reaction
rate constants increases with the changes of moisture content from field-moist to 15% in
soil under shelterbelt. In soil under adjoining cultivated field raise of the moisture
content from field-moist to 15% causes an increase of the first-order reaction rate
constants higher than in soil under shelterbelt. The processes of the changes of
nitrate reductase activity 15% moisture content of the soil under shelterbelt and in
field-moist content of adjoining cultivated fields were similar. The addition of 0.25%
nitrogen to soil under shelterbelt of 15% moisture content resulted in an increase
of the first-order reaction rate constants. However, the addition of 0.5% nitrogen
in this soil impacted on the decrease of the first-order reaction rate constant. The
addition of 0.25% and 0.5% nitrogen to the soil under adjoining cultivated field with
15% of moisture content also increased significantly the first-order reaction rate
constant.
This work was supported by a grant No. N N305 121934 founded by Polish Ministry of
Education. |
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