Germination Ecology of a Maryland Population of Saltmarsh Bulrush (Scirpus robustus)

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Abstract
Germination and growth responses ofScirpus robustus Pursh were determined for a variety of environmental conditions. A period of after-repening was required for seed germination; the most effective pretreatment was chilling at 2 C. Alternate freezing and thawing, freezing, and warm dry storage resulted in lower germination. Scarification was effective in increasing seed germination. Low concentrations of salt depressed germination and growth. A definite light requirement was found, but photoperiod length had no effect on germination responses. Alternating temperatures promoted germination; the best overall response occurred with 35 C day/25 C night. Presence ofS. robustus within the marsh community is discussed in relation to germination and seedling establishment characteristics of the species.

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