Abstract
Background and Aims: Differential capacity of species/genotypes to respond to increased atmospheric N deposition may be an important long-term driver of species composition change. In this study, differences in response to atmospheric N deposition were analysed for different accessions of Prunella vulgaris. Methods: P. vulgaris plants deriving from different N deposition accessions (0–15, 15–25 and 25–35 kg N ha−1 yr−1) were exposed to different N treatments (10 or 30 kg N ha−1 yr−1), with and without competition with the grass Bromus erectus. After 8 months, plant performance and differences in competitive ability were determined. Results: Strong effects of accession were found, often in interaction with N treatment: P. vulgaris plants from populations with low N deposition backgrounds often outperformed plants from medium to high N backgrounds, illustrated by greater biomass at high N treatment and higher chlorophyll and leaf N concentrations at low N treatments. When grown in competition, however, a strong decrease in biomass was observed for plants from all accessions. Conclusion: All accessions of P. vulgaris showed a low competitive ability. Plants from low N accessions proved to be most sensitive to competition in terms of root biomass. However, in the absence of competition, low N accessions showed a greater plasticity in nitrogen use efficiency. These results illustrate the importance of including accession when considering effects of N deposition.
Original language | English |
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Pages (from-to) | 307-318 |
Number of pages | 12 |
Journal | Plant and Soil |
Volume | 401 |
Issue number | 1-2 |
Early online date | 30 Nov 2015 |
DOIs | |
Publication status | Published - 1 Apr 2016 |
Keywords
- B. erectus
- Competition
- Management
- N accession
- N deposition
- P. vulgaris