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

Escudero, Adrián and Iriondo, José María and Olano, José Miguel and Rubio Sánchez, Agustín and 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.

Description

Title: Factors affecting establishment of a gypsophyte: the case of Lepidium subulatum (Brassicaceae)
Author/s:
  • Escudero, Adrián
  • Iriondo, José María
  • Olano, José Miguel
  • Rubio Sánchez, Agustín
  • Somolinos, Roberto
Item Type: Article
Título de Revista/Publicación: American Journal of Botany
Date: 2000
ISSN: 1537-2197
Volume: 87
Subjects:
Freetext Keywords: Brassicaceae; gypsophily; gypsum-rich soils; Lepidium; penetrometer soil resistance; seedling growth; seedling survival; structural equation modeling
Faculty: E.T.S.I. Montes, Forestal y del Medio Natural (UPM)
Department: Sistemas y Recursos Naturales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 48502
DC Identifier: http://oa.upm.es/48502/
OAI Identifier: oai:oa.upm.es:48502
Official URL: http://www.amjbot.org/content/87/6/861.short
Deposited by: Dr. Agustín Rubio Sánchez
Deposited on: 29 Nov 2017 16:59
Last Modified: 29 Nov 2017 16:59
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