Effect of α-pinene on the Soil Bacterial and Fungal Population and Soil Organic Carbon and its Variation with the Stand Age of Eucalyptus grandis Plantations.

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dc.contributor.authorMadhushani, W.H.N.
dc.contributor.authorPremetilake, M. M. S.N.
dc.contributor.authorHenegamage, A. P.
dc.contributor.authorHerath, H. M. S. K.
dc.date.accessioned2021-02-05T04:36:46Z
dc.date.available2021-02-05T04:36:46Z
dc.date.issued2020
dc.description.abstractEucalyptus is one of the most commonly established plantation forests in the world. However, they emit α-pinene which is known to have allelopathic characteristics that suppress the microbial activities. Therefore, organic matter decomposition rates could be affected by α-pinene in plantation soil which may lead to higher carbon sequestration in soil. Further emission of α-pinene could be affected by the stand age of the plantation. To investigate these the present study of the relationship between soil α-pinene content, microorganisms, and organic carbon (OC) content in 30,13 and 4 -year-old Eucalyptus grandis plantations were studied. As the control plantation, an adjacent Patana grassland (previous land-use before afforestation) was used. Three plots (20 × 20 m) were established within each site and 12 soil samples from each site were collected from 30 cm depth. Soil OC content was measured using the Walkley-Black method and microbial counts were taken using the pour plate method. The α-pinene in soil samples were analyzed using GC-MS. The highest OC content was observed in 30-year-old E. grandis plantation (3327.09 Kg) and interestingly the lowest bacterial and fungal populations (2.15 x 103 CFU mL-1 and 1.07 x 103 CFU mL-1 ) and the highest α-pinene content ((0.47% ± 0.09) were recorded in the same. There were significant positive relationships between stand age and α- pinene and OC in soil (Pearson correlation value 0.982, 0.913; p < 0.05). The OC had shown a significant negative relationship with the bacterial and fungal population (Person correlation 0.669,0.653, p < 0.05). The results showed that with the stand age, α-pinene content in soil increases and affects negatively on microbial populations which results in higher OC content in the soil. Therefore, we can conclude that as Eucalyptus grandis plantations ages they support soil carbon sequestration and the findings could be useful in promoting the minimizing of atmospheric CO2 level. Keywords: Eucalyptus grandis, Stand age, α-pinene, Organic carbon, Carbon sequestrationen_US
dc.identifier.isbn9789550481293
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/5788/proceeding_oct_08-253.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;International Research Conference
dc.subjectEnvironmental Scienceen_US
dc.subjectEcologyen_US
dc.subjectSoil Scienceen_US
dc.titleEffect of α-pinene on the Soil Bacterial and Fungal Population and Soil Organic Carbon and its Variation with the Stand Age of Eucalyptus grandis Plantations.en_US
dc.title.alternativeInternational Research Conference 2020en_US
dc.typeOtheren_US
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