Climate impact on gas emissions from forest soils



The aim of the project is to provide a better understanding of total gas-production and emission from forest soils in a changing environment.



The predicted increase in temperature and changed precipitation patterns may imply a potential for increasing mineralisation of organic matter in soil especially in forests where organic matter is accumulated.  Mineralisation and other processes in soil are sensitive to changes in soil temperature and moisture and may result in increased emissions of CO2, NO, N2O, NH3 and possibly other gases. Some of these gases act as greenhouse gases and may destabilise climate

A wide research co-operation has provided good insight especially on Norway spruce at Ulborg in W. Jutland, but also on beech at a new site at Sorø.


Project description

At Ulborg it is possible directly to measure NO, NO2 and CO2 and to collect samples for later N2O and NH3 analysis and the measurements may be completed by flux-measurements above the forest.  Manipulation of e.g. temperature and moisture will be possible in some of the plots and also different forest ecosystems may be analysed since there are 12 different tree species in different plots at the sites.  The measurements shall be conducted over extended periods, one year or longer, to provide flux-estimates useful for calculation of budgets.




Since 1985 continuous air pollution related biogeochemical studies have been conducted in Ulborg and in Frederiksborg at experimental forest plots and the forests are under continuous surveillance in a European monitoring programme. Thus the forest ecosystems are well described and facilities are available for conducting complicated measurements. More recently results have been obtained from a new site in Lille Bøgeskov near Sorø. The existing equipment for gas-colletion and analysis and the accumulated data serve as an optimal basis for integrated gas measurements.



Contact persons: UoC Helge Ro-Poulsen  [email protected]

                                     Sten Struwe [email protected]

                            DMU-NERI: Mads Hovmand  [email protected]