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

Nelson, P.N., Webb, M.J., Banabas, M., Nake, S., Goodrick, I., Gordon, J., O'Grady, D., and Dubos, B. (2014) Methods to account for tree-scale variability in soil- and plant-related parameters in oil palm plantations. Plant and Soil, 374 (1-2). pp. 459-471.

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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.

Item ID: 29159
Item Type: Article (Refereed Research - C1)
Keywords: interception; root biomass; sampling design; soil respiration; spatial variability; throughfall
Additional Information:

Due to an error contained in the online version of the article, an erratum has been published:

Nelson, P.N., Webb, M.J., Banabas, M., Nake, S., Goodrick, I., Gordon, J., O'Grady, D., and Dubos, B. (2014). Erratum to: Methods to account for tree-scale variability in soil and plant-related parameters in oil palm plantations. Plant Soil (2014) 378:415. http://dx.doi.org/10.1007/s11104-014-2066-0

ISSN: 1573-5036
Funders: Australian Centre for International Agricultural Research (ACIAR), James Cook University (JCU)
Projects and Grants: ACIAR SMCN/2009/013
Research Data: http://dx.doi.org/10.4225/28/5744DB5D11809
Date Deposited: 21 Oct 2013 01:38
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050303 Soil Biology @ 20%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0701 Agriculture, Land and Farm Management > 070101 Agricultural Land Management @ 20%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0703 Crop and Pasture Production > 070301 Agro-ecosystem Function and Prediction @ 60%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8203 Industrial Crops > 820399 Industrial Crops not elsewhere classified @ 30%
96 ENVIRONMENT > 9609 Land and Water Management > 960904 Farmland, Arable Cropland and Permanent Cropland Land Management @ 30%
96 ENVIRONMENT > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils @ 40%
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