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The distribution of volatile isoprenoids in the soil horizons around Pinus halepensis trees

Asensio, Dolores; Owen, Susan M.; Llusia, Joan; Penuelas, Josep. 2008 The distribution of volatile isoprenoids in the soil horizons around Pinus halepensis trees. Soil Biology and Biochemistry, 40 (12). 2937-2947. 10.1016/j.soilbio.2008.08.008

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Abstract/Summary

We measured the terpene concentration in pentane and water extracts from soil horizons (litter, organic, top and low mineral) and from roots growing in top and low mineral horizons on a distance gradient from Pinus halepensis L. trees growing alone on a grassland. Terpene concentrations in pentane were higher than in water extracts, although b-caryophyllene showed relatively high solubility in water. The litter and roots were important sources of terpenes in soil. Alpha-pinene dominated in roots growing in both ‘‘top’’ (A1) and ‘‘low’’ (B) mineral horizons (123+/- 36 ug g-1 or 14+/-5mg m-2) and roots in low mineral horizon (270+/-91 ug g-1 or 7+/-2 mgm-2). Beta-caryophyllene dominated in litter (1469+/-331 ug g-1 or 2004+/-481 mg m-2). Terpene concentration in soil decreased with increasing distance to the trunk. This is likely to be related to changes in litter and roots type on the distance gradient from pine to grass and herbs. The relative contributions of all compounds, except a-pinene, were similar in the mineral soils and litter. This suggests that litter of P. halepensis is probably the main source of major terpene compounds. However, long-term emissions of a-pinene from P. halepensis roots might also contribute to a-pinene concentrations in rhizosphere soils.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.soilbio.2008.08.008
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: Billett
Additional Keywords: Soil horizons, Volatile isoprenoids, Pinus halepensis, Pinus root extracts, Pinus litter extracts, Soil terpene distribution
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Date made live: 27 Nov 2008 14:30
URI: http://nora.nerc.ac.uk/id/eprint/3587

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