Shifts in N and P Budgets of Heathland Ecosystems: Effects of Management and Atmospheric Inputs
Research output: Journal contributions › Journal articles › Research › peer-review
Authors
In the present study we analyzed the combined effects of management (grazing, mowing, prescribed burning, sod-cutting) and atmospheric deposition on N and P budgets of heathland ecosystems (Lüneburger Heide nature reserve; N Germany). We hypothesize that management measures such as grazing and mowing can accelerate a deposition-induced imbalance of N and P pools as a result of a disproportionally high output of P. We analyzed management and deposition affected input-output flows of N and P and related them to changes in the nutritional status of Calluna vulgaris 5 years after treatment application. We found that grazing and mowing caused the highest net loss of P due to high P concentrations in the aboveground biomass. In contrast, prescribed burning only slightly affected P pools, as P remained in the system due to ash deposition. Management-mediated effects on N and P pools were mirrored in the nutritional status of Calluna vulgaris: at the grazed and mown sites, the P content of current season's shoots significantly decreased within 5 years after treatments, whereas the N content remained unchanged. We conclude that grazing and mowing can accelerate declining availability of P and, thus, accelerate a deposition-induced shift from N- to P-limited plant growth in the medium term. In the face of ongoing atmospheric N loads management schemes need to combine high- and low-intensity measures to maintain both a diverse structure and balanced nutrient budgets in the long term. © 2009 Springer Science+Business Media, LLC.
Original language | English |
---|---|
Journal | Ecosystems |
Volume | 12 |
Issue number | 2 |
Pages (from-to) | 298-310 |
Number of pages | 13 |
ISSN | 1432-9840 |
DOIs | |
Publication status | Published - 02.2009 |
- Biology
- Ecosystems Research