Search for projects with tag "soil"
Does long-term nitrogen deposition lead to increased microbial mining for phosphorus in organic and mineral soils, and what is the consequence for the soil carbon sink? This project use the long-term nitrogen addition experiment at Svartberget and ingrowth cores with needle litter, humus, and mineral soil with and without elevated phosphorus content. Substrates were collected in a phosphorus addition experiment in the Tönnersjöheden research forest in Halland.
Nitrogen deposition can enhance the boreal forest carbon sink but the amount of carbon stored in the soil per unit of nitrogen deposition is likely to depend on competition for nitrogen between different sinks in the soil. In this project we use the Åheden long-term nitrogen addition experiment and a root trenching treatment to study the impact of a gradient of simulated nitrogen deposition rates on the emissions of carbon from respiration in the tree root zone, as well as from free living heterotrophic organisms.
The impacts of long-term, high intensity N addition on soil organic matter accumulation in a boreal forest
PI: Shun Hasegawa
N addition is reported to influence decomposition of soil organic matters and potentially enhance carbon accumulation in boreal or temperate forests. Here, we investigate the effect of chronic N addition on boreal forests situated in norther Sweden with an aim of discerning the mechanisms altering the balance of accumulation and decomposition of soil organic matters. We will collect soil samples from the organic layer at Svartberget, Åheden, Rosinedal, Flakaliden and analyze molecular composition of soil organic matters as well as enzymatic activities responsible for C decomposition.
PI: Michael Gundale
We have set up a replicated (n=6) experiment testing for the effect of biochar addition to soil, and a wide range of properties. The experiment consists of 4 treatments, control, soil mixing, biochar addition, and biochar and mixing. The experiment is set up at Åhedon, near Svartberget field station.