AustralieFrV1, Main, Exploration, bibRecord, 004062

Methods to account for tree-scale variability in soil-and plant-related parameters in oil palm plantations

Identifieur interne : 004062 ( Main/Exploration ); précédent : 004061; suivant : 004063

Methods to account for tree-scale variability in soil-and plant-related parameters in oil palm plantations

Auteurs : P. N. Nelson [Australie] ; M. J. Webb [Australie] ; M. Banabas [Guinée] ; S. Nake [Guinée] ; I. Goodrick [Australie] ; J. Gordon [Australie] ; D. O'Grady [Australie] ; B. Dubos [France]

Source :

Plant and soil [ 0032-079X ] ; 2014.

RBID : Pascal:14-0204786

Descripteurs français

Pascal (Inist)
- Méthode, Variabilité spatiale, Relation sol plante, Paramètre, Interception, Racine, Biomasse, Plan échantillonnage, Précipitation au sol, Elaeis guineensis, Culture tropicale, Activité biologique, Caractéristique sol, Biologie du sol, Plantations, Respiration du sol.
Wicri :
- topic : Biomasse, Culture tropicale.

English descriptors

KwdEn :
- Biological activity, Biomass, Elaeis guineensis, Interception, Method, Parameter, Plantations, Property of soil, Root, Sampling design, Soil plant relation, Soil respiration, Spatial variability, Throughfall, Tropical crop.

Abstract

Background and aims Lateral tree-scale variability in plantations should be taken into account when scaling up from point samples, but appropriate methods for sampling and calculation have not been defined. Our aim was to define and evaluate such methods. Methods We evaluated several existing and new methods, using data for throughfall, root biomass and soil respiration in mature oil palm plantations with equilateral triangular spacing. Results Three ways of accounting for spatial variation within the repeating tree unit (a hexagon) were deduced. For visible patch patterns, patches can be delineated and sampled separately. For radial patterns, measurements can be made in radial transects or a triangular portion of the tree unit. For any type of pattern, including unknown patterns, a triangular sampling grid is appropriate. In the case studies examined, throughfall was 79 % of rainfall, with 95 % confidence limits being 62 and 96 % of rainfall. Root biomass and soil respiration, measured on a 35-point grid, varied by an order of magnitude. In zones with steep gradients in parameters, sampling density has a large influence on calculated mean values. Conclusions The methods defined here provide a basis for representative sampling and calculation procedures in studies requiring scaling up from point sampling, but more efficient methods are needed.

Affiliations:

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Le document en format XML

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<term>Method</term>
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<term>Plantations</term>
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<term>Elaeis guineensis</term>
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<term>Activité biologique</term>
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<front><div type="abstract" xml:lang="en">Background and aims Lateral tree-scale variability in plantations should be taken into account when scaling up from point samples, but appropriate methods for sampling and calculation have not been defined. Our aim was to define and evaluate such methods. Methods We evaluated several existing and new methods, using data for throughfall, root biomass and soil respiration in mature oil palm plantations with equilateral triangular spacing. Results Three ways of accounting for spatial variation within the repeating tree unit (a hexagon) were deduced. For visible patch patterns, patches can be delineated and sampled separately. For radial patterns, measurements can be made in radial transects or a triangular portion of the tree unit. For any type of pattern, including unknown patterns, a triangular sampling grid is appropriate. In the case studies examined, throughfall was 79 % of rainfall, with 95 % confidence limits being 62 and 96 % of rainfall. Root biomass and soil respiration, measured on a 35-point grid, varied by an order of magnitude. In zones with steep gradients in parameters, sampling density has a large influence on calculated mean values. Conclusions The methods defined here provide a basis for representative sampling and calculation procedures in studies requiring scaling up from point sampling, but more efficient methods are needed.</div>
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Methods to account for tree-scale variability in soil-and plant-related parameters in oil palm plantations

Methods to account for tree-scale variability in soil-and plant-related parameters in oil palm plantations

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri