Tree exposure to elevated CO2 increases availability of soil phosphorus. | [Pakistan Journal of Botany • 2010]

Author(s):

1. N. Faisal Khan: Environment Centre for Wales, Bangor University, Bangor, UK

2. Douglas L. Godbold: Environment Centre for Wales, Bangor University, Bangor, UK

3. Martin Lukac: NERC Centre for Population Biology, Division of Biology, Imperial College London, Silwood Park Campus, Ascot, SL5 7PY, UK

4. Franco Miglietta: IATA-CNR, P.le delle Cascine, 18 50145 Firenze, Italy

5. M. Khalid: Intitute of Soil & Environmental Sciences, University of Agriculture, Faisalabad, Pakistan

Abstract:

Future high levels of atmospheric carbon dioxide will increase biomass production of terrestrial plants, however depletion of soil mineral nutrients may act as a negative feedback to increased growth. To test this, an ecosystem phosphorus budget was calculated in poplar grown under field conditions at ambient and elevated atmospheric CO2 for 5 years. The pools of total, plant available, weatherable and organic P were estimated, as well as the P storage in tree biomass components. While as a non-significant increase in amount of P taken up by the trees. we observed, plant available P pools in the soil increased significantly. An increase in all soil P extractions was seen, with the greatest increase in an acid soluble P fraction which is considered to be the weatherable fraction. The formation of this P fraction may be biogenically driven and this additional P probably originates from weathering of occluded mineral pools.

Page(s): 907-916

DOI: DOI not available

Published: Journal: Pakistan Journal of Botany, Volume: 42, Issue: 2, Year: 2010

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