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Antia Villada, PhD studentship, University of Reading (2009-2012)
Northern temperate forests have been identified as major contributors to the terrestrial C sink. Among the different land uses, afforestation and reforestation have been recommended as practices to mitigate climate change by promoting C storage in both soils and biomass but the main factors affecting long-term C stabilization in soils remain uncertain.
This research investigated:
Results showed that tree species (beech- Fagus sylvatica L., oak- Quercus robur L., Douglas-fir- Pseudotsuga menziesii Mirb., Norway spruce- Picea abies L.Karst., and Sitka spruce- Picea sitchensis Bong) and forest type (conifers and broadleaves) had clearly and consistently (p<0.05) affected labile C pools. Not only greater labile C pools (HWEC and FLF) but also a higher peroxidase activity was found in mineral topsoil horizons beneath conifers when compared to broadleaf species at both podzol and luvisol sites. However, when testing the effect of tree species and forest types on more stabilized C pools (non-hydrolysable C and silt- and clayassociated C), no consistent results were found among sites, thus suggesting the existence of important interactions between tree species and soil forming processes.
Therefore, the interaction between soil type x tree species factors appears to be critical in determining the quality and potential stability of SOC in temperate forest soils.
Soil coring at a Douglas Fir research plot.
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