NDLI: Response of biomass allocation patterns to thinning in Pinus halepensis differs under dry and semiarid Mediterranean climates

Content Provider	Springer Nature Link
Author	Alfaro Sánchez, Raquel López Serrano, Francisco R. Rubio, Eva Sánchez Salguero, Raúl Moya, Daniel Hernández Tecles, Enrique Heras, Jorge
Copyright Year	2015
Abstract	To implement adaptive management in post-fire-regenerated Aleppo pine forests, we developed specific biomass equations in two early-thinned climatically contrasting stands. We found thinning enlarged biomass components, although climate primarily constrained biomass accumulation and biomass allocation.The increase in burnt surface by wildfires in the Mediterranean Basin has triggered the proliferation of large unmanaged forested areas, particularly Aleppo pine stands in drier and lower altitudinal areas. These young naturally regenerated stands require specific biomass models for accurate carbon stock quantification.The aim of this study is to analyse the effects of climate (dry vs. semiarid), age and forest management (early thinning) on biomass accumulation and biomass allocation of young Pinus halepensis components: stem, crown (crown wood, needles and cones) and roots.We sampled 251 individual Aleppo pine trees across an age sequence of 5–16 years old to develop component biomass equations.We observed that biomass allocation differed with climate, age and tree density. The crown was the largest biomass fraction, followed by root fraction and stem fraction. At the most limiting site (semiarid climate), we found major reproductive efforts, which may be shaped by adaptive traits to recurrent fires or recurrent drought episodes.Climate was the first limiting factor to constrain biomass accumulation and biomass allocation. Thinning played a key role in promoting positive effects on biomass components at both sites, which were enlarged under less stressful site conditions (dry climate). These results may help managers understand how altering stand density promotes more resilient forests.
Starting Page	595
Ending Page	607
Page Count	13
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	72
Issue Number	5
e-ISSN	1297966X
Language	English
Publisher	Springer Paris
Publisher Date	2015-04-30
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	Subscribed
Subject Keyword	Adaptive forest management Young post-fire Aleppo pine trees Biomass equations Biomass allocation Reproductive effort Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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