NDLI: Methods to improve the recruitment of holm-oak seedlings in grazed Mediterranean savanna-like ecosystems (dehesas)

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Annals of Forest Science : Volume 69

Annals of Forest Science : Volume 68

Annals of Forest Science : Volume 67

Annals of Forest Science : Volume 66

Annals of Forest Science : Volume 65

Annals of Forest Science : Volume 64

Methods to improve the recruitment of holm-oak seedlings in grazed Mediterranean savanna-like ecosystems (dehesas)

Content Provider	Springer Nature Link
Author	Leiva, María José Mancilla Leyton, Juan Manuel Martín Vicente, Ángel
Copyright Year	2012
Abstract	“Dehesas” are savanna-like ecosystems of human origin that extend broadly in the Mediterranean area of the Iberian Peninsula. They consist of scattered oaks (mainly Quercus ilex subsp. ballota L. holm-oak), an annual grassland layer and interspersed shrubs. These ecosystems, used for grazing and wild game, support high plant and animal biodiversity and provide important environmental services. At present, Mediterranean “dehesas” are endangered by the lack of oak regeneration.This paper analyses the efficiency of: (1) using shrubs as nurse plants; (2) drip irrigation of seedlings during summer; and (3) a combination of the two methods for the restoration of a “dehesa” in a mid-mountain Mediterranean area of southern Spain.Different techniques were tested to improve the recruitment of holm-oak seedling during a 3-year field experiment: (1) acorn plantation in open spaces, irrigating seedlings during the first dry season; (2) acorn plantation beneath the canopy of Myrtus communis L. and (3) both methods combined.There was a large facilitative effect of myrtle for the recruitment of holm-oak seedlings, regardless of the supply of irrigation. This effect was associated with a large decrease in air temperature and photosynthetically active radiation beneath myrtle canopies. By contrast, summer irrigation of seedlings planted in open spaces did not improve seedling survival after 3 years despite a small and transient positive effect on seedling survival during the 1st year.The use of evergreen shrubs, such as myrtle, as nurse plants may be considered to restore “dehesas” instead of expensive seedling irrigation techniques. Several studies have promoted abandoning grazing to increase holm oak self-regeneration in “dehesas”. However, creating closed patches of naturally occurring evergreen shrubs could provide suitable sites for oak planting when necessary, thus enhancing seedling recruitment without damaging the environmental and economic value of these ecosystems.
Starting Page	11
Ending Page	20
Page Count	10
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	70
Issue Number	1
e-ISSN	1297966X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	Subscribed
Subject Keyword	Nurse plant Photosynthetically active radiation Seedling emergence timing Seedling longevity Summer drip-irrigation of seedlings Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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