Northampton Electronic Collection of Theses and Research

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

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

Item Type: Article
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
Uncontrolled Keywords: Ancient wood - ancient forest - soil seed bank - species richness - pH - conifer plantations - Sørensen - GLM
Subjects: Q Science > QK Botany > QK640 Plant anatomy > QK661 Seeds
S Agriculture > SD Forestry
Q Science > QK Botany > QK900 Plant ecology
Creators: Erenler, Hilary E, Ashton, Paul A, Gillman, Michael P and Ollerton, Jeff
Publisher: Kluwer
Faculties, Divisions and Institutes: Faculties > Faculty of Arts, Science & Technology > Environmental Science
Date: June 2010
Date Type: Publication
Page Range: pp. 1631-1648
Journal or Publication Title: Biodiversity and Conservation
Volume: 19
Number: 6
Language: English
ISSN: 0960-3115
Status: Published / Disseminated
Refereed: Yes

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