7 sand dunes 1 sandwort lyme grass water retention and alkaline conditions when the dunes are formed from shelly sand sand dunes the psammosere plant succession the dune system is ...
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...Sand dunes sandwort lyme grass water retention and alkaline conditions when the are formed from shelly psammosere plant succession dune system is split into four zones which represent stages in changes environment at a site pioneer species to leading modications of soils microcli climax mate way favours establishment hundred years but occurs over only few metres shoreline next group replace enable development it requires former eventually community established vegetation state equilibrium with there no further iii an obstacle trap e g inux new for information contact lorna dawson hutton ac uk...