Relevance of taking into account the fine scale soil variability to assess the effects of agricultural inputs on soil characteristics and soil microbial communities: a case study of biochar application in a rubber plantation in North East Thailand

Le Guen Marie-Elodie, Herrmann Laetitia, Robain Henri, Wiriyakitnateekul Wanpen, De Oliveira Tatiana, Robin Agnès, Srimawong Prapaipit, Bräu Lambert, Lesueur Didier. 2017. Relevance of taking into account the fine scale soil variability to assess the effects of agricultural inputs on soil characteristics and soil microbial communities: a case study of biochar application in a rubber plantation in North East Thailand. Geoderma, 305 : 21-29.

Quartile : Q1, Sujet : SOIL SCIENCE

Résumé : In agricultural studies, estimating and testing differences between treatment regimes in a designed experiment usually determines the subsequent success or failure of inputs or management practices. Fine-scale soil variability of the experimental site can reduce statistical power and should be determined in order to optimize the experiment design. Although randomization is often performed, there is a probability that such randomization does not cover for fine scale soil variability. To determine the effect of this fine scale soil variability, a well characterized test system comprising of biochar's effects on soil microbial communities were studied, in conjunction with Electrical Resisitivity Tomography (ERT) to identify its role on biochar's differential interaction with soil microbial communities. Two main soil profiles were identified by the ERT survey and soil characteristics and soil microbial communities were differently affected by the biochar application with regards to soil profile. Fungal communities (mycorrhization intensity and fungal richness in particular) seemed to be more strongly affected than bacterial communities, however, these effects didn't show a similar trend in between the two studied soil profiles. Consequently, most of the effects of biochar application were masked by the soil variability of the experimental site when analysed in a nested design with randomization. Our results support the relevance of taking fine scale soil variability into account prior to the establishment of a field trial to optimize experimental design.

Mots-clés Agrovoc : plantation forestière, Hévéa, bambou, cendre, biologie du sol, Mycorhizé, Bacteria, tomographie, biodiversité, champignon du sol, fertilisation, pratique culturale

Mots-clés géographiques Agrovoc : Thaïlande

Mots-clés libres : Experimental design, Biochar, Soil microbial communities, Soil variability, Electrical resistivity tomography, Rubber tree plantation

Classification Agris : P34 - Biologie du sol
K10 - Production forestière
F04 - Fertilisation

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Le Guen Marie-Elodie, ISTOM (FRA)
• Herrmann Laetitia, Deakin University (AUS)
• Robain Henri, IRD (THA)
• Wiriyakitnateekul Wanpen, Ministry of Agriculture and Cooperatives (Thaïlande) (THA)
• De Oliveira Tatiana, ISTOM (FRA)
• Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (BRA)
• Srimawong Prapaipit, Office of Science for Land Development (THA)
• Bräu Lambert, Deakin University (AUS)
• Lesueur Didier, CIRAD-PERSYST-UMR Eco&Sols (VNM) ORCID: 0000-0002-6694-0869

Source : Cirad-Agritrop (https://agritrop.cirad.fr/584486/)

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