Factors affecting establishment of a gypsophyte: the case of Lepidium subulatum (Brassicaceae)

Escudero, Adrián; Iriondo, José María; Olano, José Miguel; Rubio Sánchez, Agustín y Somolinos, Roberto (2000). Factors affecting establishment of a gypsophyte: the case of Lepidium subulatum (Brassicaceae). "American Journal of Botany", v. 87 (n. 6); pp. 861-871. ISSN 1537-2197.

Descripción

Título: Factors affecting establishment of a gypsophyte: the case of Lepidium subulatum (Brassicaceae)
Autor/es:
  • Escudero, Adrián
  • Iriondo, José María
  • Olano, José Miguel
  • Rubio Sánchez, Agustín
  • Somolinos, Roberto
Tipo de Documento: Artículo
Título de Revista/Publicación: American Journal of Botany
Fecha: 2000
Volumen: 87
Materias:
Palabras Clave Informales: Brassicaceae; gypsophily; gypsum-rich soils; Lepidium; penetrometer soil resistance; seedling growth; seedling survival; structural equation modeling
Escuela: E.T.S.I. Montes, Forestal y del Medio Natural (UPM)
Departamento: Sistemas y Recursos Naturales
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The restriction of vascular plants to gypsum-rich soils under arid or semiarid climates has been reported by many authors in different parts of the world. However, factors controlling the presence of gypsophytes on these soils are far from understood. We investigated the establishment of Lepidium subulatum, a gypsophyte, in a nondisturbed semiarid gypsum-soil landscape in central Spain, both from spatial and temporal perspectives. Over 1400 seedlings were tagged, and their growth and survival were monitored for a 2-yr period. Several biotic and abiotic variables were measured to determine the factors controlling the emergence and early survival. These variables included the cover of annual plants, bryophytes, lichens, litter, gypsum crystals, bare fraction and cover of each perennial plant, and several soil properties (gravel, fine gravel, and fineearth fraction, conductivity, pH, gypsum content, organic matter and penetrometer soil resistance). Our results support the linkage of gypsophily with some physical properties of the surface crust. Seedlings tended to establish on the gypsum surface crust, and their survival was size dependent, probably as a consequence of the necessity of rooting below the surface crust before summer drought arrives. However, once seedlings emerged, a higher survival rate occurred on the alluvial soils of the piedmont-slope boundary where soil crusts are absent or thinner. We conclude that Lepidium subulatum may be considered a refuge model endemic with a distribution range that occupies a reduced fraction of a wider habitat from which it is probably excluded by competition.

Más información

ID de Registro: 48502
Identificador DC: http://oa.upm.es/48502/
Identificador OAI: oai:oa.upm.es:48502
URL Oficial: http://www.amjbot.org/content/87/6/861.short
Depositado por: Dr. Agustín Rubio Sánchez
Depositado el: 29 Nov 2017 16:59
Ultima Modificación: 29 Nov 2017 16:59
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