wetland habitat management. the removal of dead vegetative material from the bed of calthorpe broad nnr, norfolk broads, uk. unless removed, given time, accumulation of reed (phragmites australis), will lead to a climax plant cover of trees including alder (alnus sp.) carr, birch (betula sp.) and willow (salix sp.) to be seen in background. joe blossom date: 16.12.2008 ref: zb765_126391_0031 compulsory credit: nhpa/photoshot