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Subsite E: Drained organic soil

Forest on drained fertile organic soils has large greenhouse gas (GHG) emissions, in the same size as energy use of the Industrial sector in Sweden.

We hypothesize that rewetting of the most fertile drained organic forest soils, can reduce GHG emission significantly. A relative small land area of 400 kha (less than 2% of all Swedish productive forests), have the potential to mitigate in total around 5 Mtonnes CO2eqv, which equals 7% of the total reported Swedish emissions. These emissions can be mitigated at a comparable low cost, but needs economic incentives promoting rewetting of the soils. The afforested drained site at SCR has previously been used for agriculture (see Skogaryd history), a common fate of abandoned cropland and a target needing GHG mitigation.
Since the soil is a hotspot for GHG emissions earlier aims of sub-site E has been to determine GHG emissions and controlling factors – now one of the most studied sites on afforested drained organic soil. The site has two cabins, electric power and fiber optic internet connection.

The figure present some of the measurements that have been conducted at the site. Our aim is to use the site to test mitigation options as compared with traditional forestry.

Measurements

Net emissions of GreenHouse Gases GHG (CO2, CH4, N2O, H2O), water matter transport and ecosystem function after rewetting or replantation. The site has been intensively studied (GHG, forest production, root studies etc) and will during summer 2019 be clear-cut. The northern part is to be rewetted while the south part will be replanted after the groundwater level has been manipulated. An intensive program with both EC flux and chambers are under construction. The abiotic and biotic sampling programs will cover the clear-cut effects on the GHG fluxes in air and in soilwater.

The measuring program used to determine the net GHG balans from the site (Meyer et al 2007)