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Details for article 26 of 28 found articles
| Title: |
Temporal variability in bioassays of ammonia exchange potential in relation to plant and soil nitrogen parameters in intensively managed grassland |
| Author: |
M. Mattsson B. Herrmann M. David B. Loubet M. Riedo M. R. Theobald M. A. Sutton D. Bruhn A. Neftel J. K. Schjoerring |
| Appeared in: |
Biogeosciences discussions |
| Paging: | Volume 5 (2008) nr. 4 pages 2749-2772 |
| Year: |
2008 |
| Contents: |
The exchange of ammonia between crop canopies and the atmosphere depends on a range of plant parameters and climatic conditions but little is known about effects of management factors. We have here investigated the ammonia exchange potential of a grass sward dominated by Lolium perenne in response to cutting and fertilization. Tall grass showed a low potential for NH3 emission before cutting. During re-growth after cutting, leaf tissue concentrations of NO3<sup>−, NH4<sup>+, soluble N and total N increased along with apoplastic NH4<sup>+ concentrations. In contrast, apoplastic pH decreased resulting in largely unaltered NH3 emission potential. A high potential for NH3 emission was shown by the plant litter. Fertilization with 100 kg N ha<sup>−1 one week after cutting caused the apoplastic NH4<sup>+ concentration of the newly emerging leaves to increase dramatically. The apoplastic NH4<sup>+ concentration peaked the day after the fertiliser was applied and thereafter decreased over the following 10 days until reaching the same level as before fertilisation. A positive correlation was found between NH4<sup>+ concentrations in leaf apoplast, bulk tissue and litter throughout the experimental period. Leaf soluble N was negatively correlated with apoplastic NH4<sup>+ concentration whereas total N was weakly correlated with NH4<sup>+ concentrations in leaf tissue and soil. |
| Publisher: |
Copernicus GmbH (provided by DOAJ) |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 26 of 28 found articles
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