Short-term effects of ammonium nitrogen in upland pasture soil affected or not affected by cattle |
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Authors: | Jaroslav Hyn?t Miloslav ?imek |
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Institution: | (1) Biology Centre AS CR, v.v.i, Institute of Soil Biology, Na S?dk?ch 7, CZ 370 05 Česk? Budějovice, Czech Republic;(2) Faculty of Science, University of South Bohemia, Na S?dk?ch 7, CZ 370 05 Česk? Budějovice, Czech Republic |
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Abstract: | The short-term effects of excessive NH4+-N on selected characteristics of soil unaffected (low annual N inputs) and affected (high annual N inputs) by cattle were
investigated under laboratory conditions. The major hypothesis tested was that above a theoretical upper limit of NH4+ concentration, an excess of NH4+-N does not further increase NO3− formation rate in the soil, but only supports accumulation of NO2−-N and gaseous losses of N as N2O. Soils were amended with 10 to 500 μg NH4+-N g−1 soil. In both soils, addition of NH4+-N increased production of NO3−-N until some limit. This limit was higher in cattle-affected soil than in unaffected soil. Production of N2O increased in the whole range of amendments in both soils. At the highest level of NH4+-N addition, NO2−-N accumulated in cattle-affected soil while NO3−-N production decreased in cattle-unaffected soil. Despite being statistically significant, observed effects of high NH4+-N addition were relatively weak. Uptake of mineral N, stimulated by glucose amendment, decreased the mineral N content in
both soils, but it also greatly increased production of N2O. |
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