Search

Coastal sandplain heathlands are a rare plant community in the northeastern United States. Salt spray and water availability are likely important factors determining heathland distribution. Field surveys and manipulative experiments were performed to examine heathland species' responses to salt spray and water availability. We surveyed field distributions of four typical heathland species: Solidago puberula, Solidago rugosa, Gaylussacia baccata, and Myrica pennsylvanica. The distributions of two native tree species, Pinus rigida and Quercus ilicifolia, were also surveyed because they succeed into coastal heathlands with low disturbance frequency. We then manipulated salt spray and water in the field and measured species' water status, necrosis, and growth responses to the treatments. Predawn xylem pressure potential and necrosis were strongly affected by high salt spray and low water availability. Shoot elongation was also limited in S. puberula and S. rugosa grown in high salt, low water treatments. Gaylussacia baccata and Q. ilicifolia were particularly sensitive to high salt spray and low water, suggesting that they might excluded be from areas with those conditions. The interaction between salt spray and water availability could affect the landscape scale and should be incorporated into conservation management plans. Key words: coastal sandplain heathlands; disturbances; heathland species; northeastern USA; salt spray; water availability. [ABSTRACT FROM AUTHOR]

Examines the distributions of coastal sandplain heathland plant species and results of greenhouse studies to determine whether or not different levels of salt spray tolerance explain patterns found in the field. Evidence showing that common heathland forb and shrub species grow closer to the ocean than successional woody species; Variations found in water status, necrosis and growth responses to salt spray among species.