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Seedbank of Bingham Cienega, A Spring-Fed Marsh in Southeastern Arizona (Notes) (Report)

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eBook details

  • Title: Seedbank of Bingham Cienega, A Spring-Fed Marsh in Southeastern Arizona (Notes) (Report)
  • Author : Southwestern Naturalist
  • Release Date : January 01, 2008
  • Genre: Life Sciences,Books,Science & Nature,
  • Pages : * pages
  • Size : 193 KB

Description

ABSTRACT--Soil was collected in 2002-2003 from a cienega in southeastern Arizona to assess species present as seeds in the soil seedbank. In 2002, dominant vegetation was bulrush (Schoenoplectus pungens). Due to drought-related drying of the marsh and other hydrological changes, vegetation at the study site subsequently shifted to a monoculture of upland sunflower (Helianthus annuus). In greenhouse experiments, a total of 20 species germinated from the seedbank soil. The most abundant germinants were bulrush, cattail (Typha domingensis), and spikerush (Eleocharis macrostachya). The endangered Huachuca water umbel (Lilaeopsis schaffneriana ssp. recurva) germinated in several of the samples and additional seeds were present in the soil. A decline in total density of seeds occurred over the course of the study, probably due to loss of wetland species. Species composition of the seedbank and standing vegetation were not correlated, which is a common result in studies of seedbanks. If hydrology is restored, we predict many of the wetland species will germinate and recolonize the area, although this is limited by duration of seed viability. Thus, management of the wetland should include examination of current hydrology as soon as possible if natural reestablishment of wetland species, particularly Huachuca water umbel, is desired. RESUMEN--Tierra fue recaudada entre 2002-2003 de una cienega en el sudeste de Arizona para evaluar especies presentes como semillas en el banco de semillas de tierra. En 2002, la vegetacion dominante en la cienega era junco (Schoenoplectus pungens). Debido a una sequia en el pantano y por otros cambios hidrologicos, la vegetacion en el sitio del estudio ha cambiado a monocultivo de girasol (Helianthus annuus). En experimentos de invernadero, un total de 20 especies germinaron en el banco de semillas de tierra. Los germinantes mas abundantes fueron junco (S. pungens), espadana (Typha domingensis) y Eleocharis macrostachya. La umbela acuatica de Huachuca (Lilaeopsis schaffneriana ssp. recurva), que esta en peligro de extincion, germino en varias muestras y mas semillas estuvieron presentes en la tierra. Durante el curso del estudio ocurrio una disminucion en la densidad total de las semillas, probablemente atribuible a la desaparicion de especies de pantano. La composicion de especies del banco de semillas y la vegetacion presente no estuvieron correlacionadas, lo cual es un resultado comun en estudios de bancos de semillas. Si la hidrologia es restablecida, predecimos que muchas de las especies de pantano van a germinar y recolonizar la zona, aunque esto se limita a la duracion de la vialidad de las semillas. Por lo tanto, el manejo del pantano debe incluir, tan pronto sea posible, el examen de la condicion hidrologica actual si el restablecimiento de especies de pantano, particularmente la umbela acuatica de Huachuca, es deseado.


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