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Search for projects with tag "nitrogen"

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.

nitrogencarbonsoilorganic matterdecompositionmicrobeboreal forest

Spatial pilot

PI: Sandra Jämtgård

We want to investigate if there is a difference in the small scale spatial variation in nitrogen availability between soils of different forest production rates.

nitrogenamino acidsproteinsmicrodialysis

Carbon and N balance in Norway spruce vs. Scots pine stands throughout Sweden

PI: Robert Blasko

We are evaluating the performance of Norway spruce vs. Scots pine stands at the sites equally suitable for both species with experiments at Kulbäcksliden 1028-1029, Flakaträsk 2458, Övra 1061, and Björkheden 1062. The aim is to evaluate how the different species productivity affects C and N balance of he ecosystem and general composition of soil microbial communities.

tree speciescarbonnitrogenbalancesprucepinesoil microbial communities

Tree species and species mixing experiment at Främlingshem 1516

PI: Robert Blasko

The original aim of this experiment was to compare the growth of Scots pine vs. Norway spruce, and their mixture at a medium fertility site suitable for the growth of both species. Our aim is to evaluate the effects of tree species and their mixing on C and N balance and general composition of soil microbial communities.

tree speciestree species mixturecarbonnitrogensoil microbial communities

Effects of intensive fertilization on C and N balance

PI: Robert Blasko

We use "Fiberskog" experimental sites 1523-1527 to evaluate the effects of intensive N fertilization (100 kg N ha-1 year-1) on the ecosystem C and N balance and general composition of soil microbial communities.

fertilizationcarbonnitrogensoil microbial communitiesyield

Long-term nutrient optimization for potential forest growth and yield

PI: Hyungwoo Lim

We determine the response of biomass production and carbon accumulation in response to 30 years tree nutrition optimization. Tree nutrition has been administrated based on annual foliar nutrient detection and corresponding fertilization.

nitrogencarbonbiomasspicea abiesirrigationfertilizationnet primary production