Croissance et développement du système racinaire de semis de trois espèces de conifères : Pseudotsuga menziesii, Pseudotsuga macrocarpa et Cedrus atlantica

Grieu, Ph.; Aussenac, Gilbert

doi:10.1051/forest:19880202

Cited by 4 publications

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“…However, at high altitudes, the role of vegetation cover can be dangerous. Indeed, shading delays seed germination (M'Hirit, 1987;Grieu & Aussenac, 1988;Ezzahiri & Belghazi, 2000). In the case of Atlas cedar, rates of vegetation cover up to 50% were usually favorable to regeneration as opposed to extreme recoveries (Ezzahiri and Belghazi, 2000).…”

Section: Influence Of Rate Of Vegetation Cover On Seedlings Of the Atmentioning

confidence: 99%

Evaluation of the influence of dendrometric and ecological factors on the natural regeneration of “Cedrus Atlantica Mannetti” In Ain Antar forest, Algeria

Bared¹,

Berrichi²

2018

LSJ

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This study aims to evaluate the effect of dendrometric and ecological factors on the natural regeneration of the Atlas cedar "Cedrus atlantica Mannetti" in AinAntarforest,Algeria. This study wascarried out in 14 circular plots of 500 m2area.In order to quantify the seedlingclasses, six sub-plots of 1 m2were installed in each plot.The results of the dendrometric data showedthe presence of a "Gaussian distribution" with a dominance offruitingdiameters(37.5 and 57.5 cm).The results of ecological parameters revealedthat in high altitudes, above 1300 m, natural regeneration seemedto be relatively difficult (30% compared to low and medium altitudes). On slopes greater than 30%, seedlings of less than one year old were less present (20 % compared to the seven first plots). The role of the vegetation cover (40–0%), the litter cover (30–40%) and of the soil depth (shallow and deep) appearedto favor the survival of seedlings, especiallywhen they werestill young. The correlation analysis indicatedthat the different seedling classes became less numerous when altitude, slope and basal area increased.

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Section: Influence Of Rate Of Vegetation Cover On Seedlings Of the Atmentioning

confidence: 99%

Evaluation of the influence of dendrometric and ecological factors on the natural regeneration of “Cedrus Atlantica Mannetti” In Ain Antar forest, Algeria

Bared¹,

Berrichi²

2018

LSJ

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“…For instance, trees in the semi-arid savanna-woodlands of West Africa have deep rooting systems, hence the below-ground fraction may contain more than 50% of the woody biomass (Grieu and Aussenac 1988;Logbo et al 2011). Thus, robust estimation of BGB is clearly essential for determining regional C balances and C allocation patterns.…”

Section: Introductionmentioning

confidence: 99%

“…Another current limitation is that more attention has generally been paid to estimation of AGB than BGB (e.g., Zianis 2008), although BGB accounts for substantial proportions of total biomass , ranging from 10 to 90%, depending on vegetation type (Cairns et al 1997;Mokany et al 2006;Hairiah et al 2010) and agro-ecological conditions (Grieu and Aussenac 1988). For instance, trees in the semi-arid savanna-woodlands of West Africa have deep rooting systems, hence the below-ground fraction may contain more than 50% of the woody biomass (Grieu and Aussenac 1988;Logbo et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Allometric equations for below-ground biomass of four key woody species in West African savanna-woodlands

Koala¹,

Sawadogo²,

Savadogo³

et al. 2017

Silva Fenn.

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Highlights• Species-specific equations for belowground biomass (BGB) predicted biomass with less bias than generic equations.• All the generic equations underestimated BGB.• For accurate estimation of BGB in savanna-woodlands, species-specific equations are needed for more species. AbstractAccurate estimates of both above-ground biomass (AGB) and below-ground biomass (BGB) are essential for estimating carbon (C) balances at various geographical scales and formulating effective climate change mitigation programs. However, estimating BGB is challenging, particularly for forest ecosystems, so robust allometric equations are needed. To obtain such equations for savanna-woodlands of the West African north sudanian zone, we selected four common native woody species (Anogeissus leiocarpa (DC.) Guill. & Perr., Detarium microcarpum Guill. & Perr., Piliostigma thonningii (Schumach.) Milne-Redh. and Vitellaria paradoxa C.F. Gaertn.). At two sites in Burkina Faso, we determined the BGB of 30 trees of each of these species by excavation, and measured various above-ground dimensional variables. The root:shoot ratio varied widely among the species, from 0.1 to 3.4. Depending on the species, allometric equations based on stem basal area at 20 cm height, basal area at breast height and tree height explained 50-95% of the variation in BGB. The best generic equation we obtained, based on basal area at 20 cm, explained 60% of the variation in BGB across the species. Three previously published generic allometric equations underestimated BGB by 8 to 63%. The presented equations should significantly improve the accuracy of BGB estimates in savanna-woodlands and help avoid costly needs to excavate root systems.

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et al. 2001

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Croissance et développement du système racinaire de semis de trois espèces de conifères : Pseudotsuga menziesii, Pseudotsuga macrocarpa et Cedrus atlantica

Abstract: RésuméCette étude a pour objectif de comparer la croissance racinaire en minirhizotrons, de

Cited by 4 publications

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Evaluation of the influence of dendrometric and ecological factors on the natural regeneration of “Cedrus Atlantica Mannetti” In Ain Antar forest, Algeria

Evaluation of the influence of dendrometric and ecological factors on the natural regeneration of “Cedrus Atlantica Mannetti” In Ain Antar forest, Algeria

Allometric equations for below-ground biomass of four key woody species in West African savanna-woodlands

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