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Carbon Turnover at Varying Depths in Hyytiälä: Key Findings and Future Research

This study investigates carbon turnover in different soil depths in Hyytiälä, focusing on CO2 and CH4 kinetics, microbial biomass, and activities. The research explores the impact of recolonizing vegetation on C and N forms and emissions, as well as correlations with microbial communities and peat organic matter components. It aims to understand the relationship between C turnover and management practices over time.

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Carbon Turnover at Varying Depths in Hyytiälä: Key Findings and Future Research

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  1. WP O6 - Carbon turnover at different depths Hyyttiala main concluded remarks • Kinetics of CO2 well characterized : strong increasing from 1 to 4 days and slowing down of emission after 4 days • Kinetics of CH4 release not well characterized, depending on the site, the depth • In addition, emissions of CH4 were rather smaller in anaerobic conditions than in aerobic ones • CH4/CO2 ratios collected from laboratory incubations were very small, calling into question its use as a regeneration index

  2. WORK PROGRAMME 1 : November 2003 sampling First set of data 1. Soluble N and C (ppm and stocks expressed as gL-1) 2. Microbial biomass (FE) N and C (same units as above) 3. Microbial activity (aerobiosis and anaerobiosis)  C-CO2 and C-CH4 release at 20°C • Second set of data • 1. SIR Biomass (Control, Bacteria, Fungi, Archaea) • 2. Microbial activity (aerobiosis and anaerobiosis) •  No glucose added, only inhibitors of the specific groups • As there was not enough material, we mixed depthes 3 & 4

  3. Sites : A B C D E Carbon Microbial Biomass Microbial biomass µg C g-1 DP, decreased with depth * significant correlation between results expressed as ppm with those expressed as g L-1 (R2 > 0.88 for C and N)  correlations not so good for soluble C-N in the peat (R2 about 0.5)

  4. WORK PROGRAMME 1 : November 2003 samples • Set of variables interesting indicator research • 1. Soluble forms of C and N, microbial biomass, activities • Country, (site)* and depth effect • 2. More integrative parameters • - C mineralization rate = C production/ SOC • - Microbial Turnover = C production/Biomass C • at a global level and at main group level (Bacteria, Fungi, Archaea) • - Ratios • Aerobiosis/ Anaerobiosis ratio • Bacteria/Fungi, Archaea/Fungi * To test a site effect  need of precisions for fitting correspondance between site ?

  5. Some examples : Nitrogen Microbial Biomass Country and depth effects on « N microbial biomass » (Kruskal-Wallis non parametric test)

  6. C Microbial Turnover (= Activity/Biomass) Country and depth effects (Kruskal-Wallis non parametric test)

  7. - the amount of N in the biomass  aerobiosis - the amount of N in the biomass  in anaerobiosis Carbon Microbial Turnover would depend on :

  8. BIOMASS in % of total B+F+A SIR BIOMASS ratios BACTERIA, FUNGI, ARCHAEA Kruskal-Wallis non parametric test

  9. BACTERIA, FUNGI, ARCHAEA Kruskal-Wallis non parametric test Peatland level (Baupte) - Bacterial activity decreased with depth compared to that of fungi - Ratio higher in Eriophorum site compared to bare peat one

  10. WORK PROGRAMMES 1 & 2 - field measurements finally started at the end of July after many breakdowns (GC, IRGA and so on) and events such as flooding, act of vandalism, … WORK PROGRAMME 3 - lab experiment correctly started at the mid of September first set of samples dispatched (München, Caen) - the 2nd harvest of peat columns : at the end of November

  11. The end

  12. WP O6 - Carbon turnover at different depths Objectives • To determine impact of recolonizing vegetation on soluble organic forms of C and N and emissions of CO2 and CH4 from restored cut-over sites • To correlate rates of C turnover with structure of microbial communities (WP03) and the peat organic matter components at different depths (WP05) • To relate C turnover to management practices and procedures at different time scales

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