Soil bacterial biodiversity in development of secondary logged-over forest to oil palm plantation in mineral soil of Belaga Sarawak

Shamsilawani Ahamed Bakeri, . and Mohd Shawal Thakib Maidin, . and Mohd Mazmira Mohd Masri, . Soil bacterial biodiversity in development of secondary logged-over forest to oil palm plantation in mineral soil of Belaga Sarawak. pp. 394-411. ISSN 1511-2780

Conversion of forest to oil palm typically results in significant land changes within the soil for example extensive damage to the top soil soil compaction and erosion. Such changes are often related to reductions within the biodiversity and abundance of the soil microbial communities. By using 16S rDNA and denaturing gradient gel electrophoresis we investigated the microbial composition between oil palm plantations at various stages of planting in mineral soil of Belaga Sarawak in Malaysia and forest ecosystem (biodiversity strip). Bacterial composition within biodiversity strips of secondary logged-over forests was mostly dominated by unclassified bacteria Acidobacteria and Actinobacteria followed by -Proteobacteria whereas oil palm management areas were most commonly consisted of unclassified bacteria Firmicutes -Proteobacteria Actinobacteria Acidobacteria and Chloroflexi. In a newly developed oil palm plantation pH factor with the addition of fertiliser during land clearing altered the bacteria composition affecting several phyla especially Acidobacteria and with increasing pH the population showed an abundance of Firmicutes -Proteobacteria -Proteobacteria Chloroflexi and Bacteroidetes. Shifts in the bacterial community of the oil palm plantation especially with the increasing number of the phylum Firmicutes -Proteobacteria Bacteroidetes and the decreasing number of -Proteobacteria caused by the slight increase of pH values indicated that changes of soil properties introduced by field management (e.g. fertiliser application) somehow affects bacterial composition. Nevertheless the method of intercropping oil palm with black pepper and pineapple during oil palm aged 4.5 years showed increasing emergence of minor phyla from Gemmatimonadetes Planctomycetes Chlamydiae and Cyanobacteria which contributes to the diverse variations of new phylum to the microbial diversity of the oil palm area indicating this method as a sustainable system for the oil palm management. Overall there is a need for further research in using sustainable methods such as a suitable intercropping system that can positively improve soil fertility and a balanced long-term usage of biofertilisers and chemical fertilisers which can enhance the biodiversity of the bacterial community and contributes to the sustainable development of oil palm plantations.

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Abstract

Conversion of forest to oil palm typically results in significant land changes within the soil for example extensive damage to the top soil soil compaction and erosion. Such changes are often related to reductions within the biodiversity and abundance of the soil microbial communities. By using 16S rDNA and denaturing gradient gel electrophoresis we investigated the microbial composition between oil palm plantations at various stages of planting in mineral soil of Belaga Sarawak in Malaysia and forest ecosystem (biodiversity strip). Bacterial composition within biodiversity strips of secondary logged-over forests was mostly dominated by unclassified bacteria Acidobacteria and Actinobacteria followed by -Proteobacteria whereas oil palm management areas were most commonly consisted of unclassified bacteria Firmicutes -Proteobacteria Actinobacteria Acidobacteria and Chloroflexi. In a newly developed oil palm plantation pH factor with the addition of fertiliser during land clearing altered the bacteria composition affecting several phyla especially Acidobacteria and with increasing pH the population showed an abundance of Firmicutes -Proteobacteria -Proteobacteria Chloroflexi and Bacteroidetes. Shifts in the bacterial community of the oil palm plantation especially with the increasing number of the phylum Firmicutes -Proteobacteria Bacteroidetes and the decreasing number of -Proteobacteria caused by the slight increase of pH values indicated that changes of soil properties introduced by field management (e.g. fertiliser application) somehow affects bacterial composition. Nevertheless the method of intercropping oil palm with black pepper and pineapple during oil palm aged 4.5 years showed increasing emergence of minor phyla from Gemmatimonadetes Planctomycetes Chlamydiae and Cyanobacteria which contributes to the diverse variations of new phylum to the microbial diversity of the oil palm area indicating this method as a sustainable system for the oil palm management. Overall there is a need for further research in using sustainable methods such as a suitable intercropping system that can positively improve soil fertility and a balanced long-term usage of biofertilisers and chemical fertilisers which can enhance the biodiversity of the bacterial community and contributes to the sustainable development of oil palm plantations.

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Item Type:	Article
AGROVOC Term:	Elaeis guineensis
AGROVOC Term:	Oil palms
AGROVOC Term:	Plantation
AGROVOC Term:	Soil microorganisms
AGROVOC Term:	Microbial flora
AGROVOC Term:	Purification
AGROVOC Term:	Extraction
AGROVOC Term:	Soil sampling
AGROVOC Term:	Ribosomal rna
AGROVOC Term:	DNA
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8677

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