Wood growth response of Calluna vulgaris (L.) Hull to elevated N deposition and drought |
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Authors: | Jonathan GA Lageard Deirdre B Wilson Neil Cresswell Leigh E Cawley Helen E Jones Simon JM Caporn |
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Abstract: | Ring diameters and ring number counts were recorded from Calluna stem cross-sections harvested during an N manipulation experiment. The application of dendrochronological methods permitted accurate ageing of shrubs growing in a heathland of known age. Linear regression analyses demonstrated a highly significant association between increasing levels of N input and stem diameter in both watered and droughted plots (droughted in 1997 only). N inputs were identified as the most significant environmental stressor, appearing to speed ageing vis the Calluna growth cycle. Drought sensitivity was noted in the high N treatment plots (120 kg N ha−1 yr−1) with decreased stem diameters. This may have implications in the response of Calluna growth under current climate change scenarios. |
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Keywords: | Growth rings Dwarf shrubs Calluna vulgaris UK lowland heathland Nitrogen Climate change |
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