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- W1505841298 abstract "Gaps differing in size, form and season of origin (September1978 and March 1979) were created artificially in adjacent north- andsouth-facing grasslands in North Derbyshire.Detailed measurements revealed marked differences between thetwo sites in patterns of vegetative regrowth and regeneration fromseed. Specific effects of gap type and time of origin were detectedon both slopes.Creation of gaps exerted pronounced effects upon the relativeabundance of established components of the north-facing turf.Accumulations of bryophytes were considerably less after three yearsthan in undisturbed turf and Avenula pratensis tended to be reducedin comparison with potentially faster-growing species such asPlantago lanceolata and Holcus lanatus.Effects of comparable magnitude were not induced on the southfacing slope and it is suggested that this may be related to the highlevel of disturbance normally experienced by the vegetation on thisslope.On the north-facing slope where seedlings are comparativelyscarce in undisturbed turf, gap creation promoted spring germinationin species which maintain relatively persistent seed reserves at ornear the soil surface. In marked contrast on the south-facing slope,large numbers of seedlings appeared in the autumn in both gaps andcontrol areas. Such patterns are consistent with previous laboratorystudies which revealed differences in germination requirementsbetween the species concerned.On the south-facing slope seedling survival was often highestin areas where resprouting vegetative shoots were relatively dense.However, the benefit of this apparent 'shelter effect' rarelyextended to seedling size which tended to decline in close proximityto vigorous vegetative shoots.In the concluding section of the thesis, the main results ofthe investigation are reviewed in relation to the influence of aspectupon vegetation structure, current theories on the determinants of'species richness' and opportunities to control species compositionby more informed grassland management." @default.
- W1505841298 created "2016-06-24" @default.
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- W1505841298 date "1984-01-01" @default.
- W1505841298 modified "2023-09-28" @default.
- W1505841298 title "A quantitative study of gap recolonization in two contrasted limestone grasslands" @default.
- W1505841298 hasPublicationYear "1984" @default.
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