| Autor: |
Doreen M. Howard, Anthony F. Harrison, K. Taylor, J. C. Hatton |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
The Journal of Applied Ecology. 31:351 |
| ISSN: |
0021-8901 |
| DOI: |
10.2307/2404549 |
| Popis: |
The role of nitrogen (N) in limiting herbage production was assessed in an altitudinal sequence of Agrostis-Festuca grasslands in the Moor House National Nature Reserve. For most of the growing season the concentration of ammonium-N found in the soils at the times of sampling greatly exceeded that of nitrate-N. Laboratory determinations of soil N mineralization rates at field growing season temperatures showed that mineral N accumulated almost entirely as nitrate in samples from lower altitudes and as ammonium in soil samples taken at the highest altitude. A linear relationship between the mean annual concentration of N in the herbage and primary production in the four grassland sites suggests that soil N supply was a limiting factor (...) |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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