Factors determining species richness of soil seed banks in lowland ancient woodlands

Erenler, Hilary E. and Ashton, Paul A. and Gillman, Michael P. and Ollerton, Jeff (2010) Factors determining species richness of soil seed banks in lowland ancient woodlands. Biodiversity and Conservation, 19 (6). pp. 1631-1648. ISSN 0960-3115

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Factors determining species richness of soil seed banks in lowland ancient woodlands

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Abstract

The demise of coppicing in UK ancient woodlands, combined with the planting of non-native, fast-growing conifers in the twentieth century, heightens the potential recharge value of ground flora seed banks. Soil cores from adjoining semi-natural and conifer-containing stands in four lowland ancient woods in central England were removed to establish seed bank species richness. During a fourteen-month germination trial soil from two depths yielded 6554 seedlings from 81 species, ten of which showed a strong affinity for ancient woodland conditions. Juncus effusus accounted for 80 of emergent seeds whilst 23 other species, including Lysimachia nummularia and Potentilla sterilis, were represented by only one individual. Species richness is described by a model that explains 40 of observed variance (P < 0.00001). The model has three significant variables: species richness increases as soil pH rises, and decreases with both depth and increasing time since the most recent planting/disturbance event. No difference was found in the density of seeds from species common to paired semi-natural and conifer-containing stands that were separated only by a woodland ride, suggesting prior management and environmental conditions have a greater influence on seed banks than current stand type. Sørensen similarity index values revealed poor congruence between above-ground vegetation and species in the seed bank. Taking pH measurements in conifer stands identified as younger in terms of planting/disturbance may help locate areas where greater numbers of species (including woodland specialists) are located. Caution is required, however, as these seed banks may also contain non-target, competitive species that may swamp the regeneration of woodland specialists. © 2010 Springer Science+Business Media B.V.

Keywords:coniferous tree, dicotyledon, pH, plantation, seed bank, soil depth, species richness, twentieth century, woodland, England, United Kingdom, Coniferophyta, Juncus effusus, Lysimachia nummularia, Potentilla, Potentilla sterilis, Ancient wood
Subjects:C Biological Sciences > C182 Evolution
D Veterinary Sciences, Agriculture and related subjects > D512 Tree Physiology
Divisions:College of Science > School of Life Sciences
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ID Code:15506
Deposited On:16 Oct 2014 10:34

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