NDLI: Functional performance of oak seedlings naturally regenerated across microhabitats of distinct overstorey canopy closure

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Functional performance of oak seedlings naturally regenerated across microhabitats of distinct overstorey canopy closure

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Functional performance of oak seedlings naturally regenerated across microhabitats of distinct overstorey canopy closure

Content Provider	Springer Nature Link
Author	Rodríguez Calcerrada, J. Ca, F. J. Valbuena Carabaña, M. Gil, L. Aranda, I.
Copyright Year	2009
Abstract	The extent to which seedling recruitment is limited by summer drought in Mediterranean-type ecosystems depends on the light microsite, yet the relationship between light availability and water status, functional performance, and survival of seedlings in these systems is still unclear. Over a 3-year period, we studied the pattern of survival and functional performance of seedlings of Quercus petraea (Matt.) Liebl. and Quercus pyrenaica Willd. in a montane forest in central Spain, which is the southern edge of the natural range of Q. petraea. After a mast year of the two species, 72 plots were established in six microhabitats spanning a range of overstorey canopy closure: closed, partial and open canopies dominated by either Q. petraea or Q. pyrenaica adult trees. Seedlings of each species naturally emerged beneath the conspecific-dominated canopies. The second and third years of study were extremely dry. Three years after emergence, the greatest seedling survival occurred beneath the partial canopy of Q. pyrenaica trees (8%) and the lowest (0%) beneath the closed canopies of Q. pyrenaica and Q. petraea. Survival for Q. pyrenaica increased linearly with understorey light across the range of 10–35% Global Site Factor. Plant water deficit (estimated by leaf water potential) was high across microhabitats, and increased with light availability for Q. pyrenaica. Potential for photosynthesis (estimated by the electron transport rate of photosystem II) decreased with canopy closure; and potential for light harvesting (e.g. specific leaf area (SLA) and chlorophyll concentration) increased with closure. Extreme water deficit could be the main contributor to seedling death in the more open microhabitats, whereas light level was insufficient to maintain carbon balance under the water-stressful conditions existing beneath the closed tree canopies. Seedling establishment appears to be a limiting factor for the recruitment of both oaks within this forest in a wide range of microhabitats, especially for the more drought-sensitive Q. petraea. Moderate reductions of tree canopy cover can improve seedling establishment, but extreme summer droughts can prevent the success of any silvicultural practice made.
Starting Page	245
Ending Page	259
Page Count	15
File Format	PDF
ISSN	01694286
Journal	New Forests
Volume Number	39
Issue Number	2
e-ISSN	15735095
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-09-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Summer drought Mediterranean montane forests Tree canopy facilitation Dry understorey Quercus petraea Quercus pyrenaica Forestry
Content Type	Text
Resource Type	Article
Subject	Forestry

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