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Factors Influencing Germination Of Six Wetland Cyperaceae, John L. Larson
Factors Influencing Germination Of Six Wetland Cyperaceae, John L. Larson
Field Station Bulletins
In order to determine factors which may affect the differential seed germination of six members of the Cyperaceae which occur together in newly revegetated sedge meadow, seeds were tested for germ inability at three storage conditions. Seeds were also germinated at two alternating temperature regimes, 21/25° and 25/32°C. Germination of dry stored Carex hystericina and C. vulpinoidea was greater at the higher alternating temperature of 25/32°C while Scirpus atrovirens and S. cyperinus dry stored seed had a similar germination response at both alternating temperatures. Most of the moist-cool stored (stratified) seeds of the six species germinated well regardless of temperature. …
Seed Germination Requirements Of Four Species Co-Occurring In A Wisconsin Sedge Meadow, John L. Larson
Seed Germination Requirements Of Four Species Co-Occurring In A Wisconsin Sedge Meadow, John L. Larson
Field Station Bulletins
Seeds of four colonizing species which occur together in a recently revegetated sedge meadow were tested for germination after storage under three different conditions. Seeds were tested at an alternating temperature regime of 21° C dark, and 32° C light. Three species, Bidens frondosa, B. coronata, and Scirpus cyperinus germinated most successfully when stored under moist-cool conditions. Germination of Carex scoparia was consistently high and was not affected by storage condition. Differences in seed germination among the four species may contribute to their coexistence in highly disturbed environments such as newly revegetated sedge meadows.
Purple Loosestrife (Lythrum Salicaria L.) In A Southeastern Sedge Meadow, John L. Larson
Purple Loosestrife (Lythrum Salicaria L.) In A Southeastern Sedge Meadow, John L. Larson
Field Station Bulletins
Floristic and seed bank composition of a sedge meadow containing purple loosestrife was examined in 1987 and 1988. Eleocharis spp., Spiraea tomentosa, Triadenum vircrinicum, and Lycopus spp. were widespread while infrequent or absent in nearby sedge meadows without purple loosestrife, suggesting that these species have similar microsite requirements. Changes noted in some species over time probably resulted from changes in climatic and soil moisture conditions. The seed bank reflected the dominant herbaceous vegetation but lacked a few species having moderate frequencies in the established vegetation. Limited samples, unsuitable germination conditions in the greenhouse, autumn seed germination by some species and …