Jens-Arne worked at SEI York.

Following his PhD, Jens-Arne spent 2 years at the Second University of Naples, where he worked with Prof. F. Cotrufo on issues of soil CO2 efflux partitioning.

Jens-Arne's work included experiments with isotopically labelled (13C) litter material to determine the amount of CO2 from litter decomposition and interactions between rhizosphere, bulk soil, and litter decomposition. A further focus was the development of a respiration system that measures soil CO2 efflux at constant chamber CO2 concentration.

The motivation for this development is the capture of the isotopic composition of soil respired CO2 , which is sensitive to concentration gradients that are inherent to conventional chamber systems.

His work at SEI York concentrated on the fate of ozone in a plant-soil system. It involves a novel experimental approach, in which plant-soil systems are fumigated with isotopically labelled ozone (18O).

The aim is to trace the flux of this pollutant to individual components within the plant and the soil. This work is done in close cooperation with groups at the universities of Newcastle, Bradford and Bristol.

Publications

• Turnover of recently assimilated carbon in arctic bryophytes (Journal article - 2011)

• Reduction of forest soil respiration in response to nitrogen deposition (Journal article - 2010)

• On the ‘Temperature Sensitivity’ of soil respiration: Can we use the immeasurable to predict the unknown? (Journal article - 2010)

• Tracing photosynthetic isotope discrimination from leaves to soil (Journal article - 2010)

• Dynamics and pathways of autotrophic and heterotrophic soil CO2 efflux revealed by forest girdling (Journal article - 2010)

• The ‘overflow tap’ theory: linking GPP to forest soil carbon dynamics and the mycorrhizal component (Conference paper - 2010)

• The Global Carbon Cycle: It’s a Small World (Conference paper - 2010)

• Rhizosphere activity and methane oxidation in a temperate forest soil (Proceedings - 2010)

• The carbon cycle of Arctic Fennoscandia: Assimilating multi-scale observations into ecological models (Conference paper - 2010)

• Short-term dynamics of abiotic and biotic soil 13CO2 effluxes after in situ 13CO2 pulse labelling of a boreal pine forest (Journal article - 2009)

Complete list of publications »

Projects

• Tropospheric Ozone Pollution - TOPS