Impact of prescribed burning on the nutrient balance of heathlands with particular reference to nitrogen and phosphorus
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Authors
Question: Can prescribed winter burning compensate atmospheric nutrient loads for dry heathlands? What effects does prescribed burning have on nutrient balances, particularly as regards the limiting nutrients N and P? Location: Lueneburg Heath, NW Germany. Methods: In two burning experiments (in 10/15 year old Calluna-stands) nutrient balances (for N, Ca, K, Mg, P) were calculated by analysing nutrient inputs (atmospheric deposition, ash deposition), nutrient stores (above-ground biomass, organic horizon) and nutrient outputs (biomass combustion, leaching). Results: Atmospheric nutrient deposition amounted to 22.8 kg.ha -1.a -1 for N and < 0.5 kg.ha -1.a -1 for P. Nutrient stores in the above-ground biomass were 95/197 kg.ha -1 for N and 5/13 kg.ha -1 for P (first/second experiment, respectively). From these stores 90/53% (for N) and 25/14% (for P) were removed by burning. Effects of leaching on nutrient balances were low. In the first two years after burning, leaching rates of N increased by about 4/6 kg.ha -1, whereas leaching rates of P did not change significantly. Input/output-ratios showed that prescribed burning leads to positive nutrient balances for N, Ca and Mg in the long term. For example, the amounts of N removed by prescribed burning are equivalent to ca. five years of atmospheric inputs. Applied in ten-year cycles, this measure alone cannot prevent N accumulation in the long term. Conclusion: Regarding 10/15 year old Calluna-heaths, we assume that prescribed burning cannot compensate for atmospheric N inputs, thus making long-term changes in the nutritional state inevitable. Therefore, prescribed burning should be applied in combination with high-intensity management measures.
Original language | English |
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Journal | Applied Vegetation Science |
Volume | 8 |
Issue number | 2 |
Pages (from-to) | 183-192 |
Number of pages | 10 |
ISSN | 1402-2001 |
DOIs | |
Publication status | Published - 11.2005 |
- Ecosystems Research
- Biology
- Above-ground biomass, Atmospheric nutrient deposition, Calluna vulgaris, Deschampsia flexuosa, Heathland management, Leaching, Nutrient removal