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Thesis work in Ecosystem ecology

Thesis work in Ecosystem ecology. 2008-06-19. 2008-07-07. Mycorrhizal and fine root turnover The rate that fine roots and rhizomorphs release CO 2 to the atmosphere has important implications for global C balance, but the mechanisms and processes that regulate

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Thesis work in Ecosystem ecology

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  1. Thesis work in Ecosystem ecology 2008-06-19 2008-07-07 • Mycorrhizal and fine root turnover • The rate that fine roots and rhizomorphs release CO2 • to the atmosphere has important implications for global C • balance, but the mechanisms and processes that regulate • C dynamics in these pools are not well understood. • Fine root production has been estimated to account for up • to 33% of global annual net primary production, but the • global contribution of rhizomorphs remains unknown. • Rhizomorphs largely consist of newly fixed C directly • allocated from the leaves and only passing through the • fine roots. Therefore, it is crucial to understand the factors • controlling fine root and rhizomorph production at the • ecosystem scale for better understanding of CO2 fluxes • and nutrient cycles at global scales. • This study will use either in-growth tubes or image analysis and minirhizotron technique to investigate production and turnover of mycorrhizal hyphaes and fine roots in a drained peatland. Fine roots Mycorrhizal hypae / Rhizomorphs Contact: Robert Björk (robert.bjork[at]dpes.gu.se)

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