Impact of ploughing on soil seed bank dynamics in temporary pools |
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Authors: | Vincent Devictor Jacques Moret Nathalie Machon |
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Institution: | (1) UMR 5173 CNRS MNHN Conservation des Espèces, Restauration et Suivi des Populations, Muséum National d’Histoire Naturelle, 61 Rue Buffon, 75005 Paris, France;(2) UMS 2699 Inventaire et Suivi de la Biodiversité, Conservatoire botanique National du Bassin parisien, Muséum National d’Histoire Naturelle, 55 Rue Buffon, 75005 Paris, France |
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Abstract: | We examined the impact of ploughing on soil seed banks of plant communities living in temporary marshes located in agricultural
fields. The quantity, quality and vertical distribution of seeds were quantified under ploughed or unploughed treatment at
community level. We also focussed on a typical semi-aquatic species, Damasonium alisma, to investigate the impact of ploughing at population level. We used two complementary techniques to study seed banks: hand
sorting and seedling emergence. We found that species richness of seeds, seed abundance and germination ability were strongly
affected by ploughing at community level. Concerning D. alisma, most of the seeds (56%) were stored in the two deepest soil layers among the four considered in ploughed pools. Moreover,
the germination rate was higher for buried seeds (84%) than for seeds collected at the surface (33.6%). These patterns were
almost inverted in unploughed pools. Our results agree with the temporal storage effect generally suggested to describe the
seed bank property of plant communities. But in addition, we showed that ploughing induces a spatial storage effect in accumulating
species and individuals in the seed banks that favourably influence community dynamics. We conclude that, in contrast to what
is usually thought, ploughing disturbance can be of benefit for such ephemeral wetland vegetation. |
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Keywords: | Agricultural practices Community Damasonium alisma Ephemeral vegetation Storage effect Wetland |
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