Search for projects with tag "carbon"
[ID: 380] Deep groundwater carbon sources and age
PI: Marcus Klaus
Groundwater is one of the largest continental carbon (C) pools, but it is unclear where this C comes from and how long it resides in the subsurface before being released to the atmosphere through inland waters. The aim of this project is to unravel the magnitude, sources and age of C in groundwater aquifers within the Krycklan Catchment study. Twelve groundwater wells of different depth are sampled for carbon age, bulk groundwater age and concentrations of various carbon species, including dissolved organic and inorganic carbon and methane. The project will enable the quantification of legacy effects of groundwater in the C cycle and potential delays in the response of C emissions from groundwater-fed inland waters to changes in land C uptake. The project results will have implications for the development of more accurate landscape C models.
Large areas (up to 20%) of the Swedish forest land have been artificially drained by ditching during the past centuries to increase timber production. When these ditches age, ditch cleaning must often be conducted in order to maintain high timber productivity. For other areas no production increase has occurred. These areas have recently been suggested as potential areas for restoration to their “natural state” as wetlands, as a way to improve biodiversity and mitigate hydrological floods or droughts. This project will focus on the surface water effects of these two forest management operations, ditch cleaning (DC) and wetland restoration (WR). There is currently limited information on how DC and WR operations affects the amount and composition of terrestrial carbon (C) being exported to surface waters.
[ID: 151] 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.
[ID: 107] Comparison of ecosystem C and N stocks 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 in the 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 stocks of he ecosystem and some of the important C fluxes; soil CO2 efflux and litterfall.
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 near Främlingshem suitable for the growth of both species. Our aim was to evaluate the effects of tree species and their mixing on ecosystem C and N stocks, as well as on some of the important C fluxes.
[ID: 105] Effects of intensive N fertilization on ecosystem C and N stocks, soil CO2 efflux, and litterfall
PI: Robert Blasko
We use intensive nutrient enrichment experiments 1523-1527 along a latitudinal gradient in Sweden to evaluate the effects of intensive nutrient (NPK) fertilization (100 kg N ha-1 year-1) on the ecosystem C and N stocks, soil CO2 efflux, and litterfall C inputs.
PI: Hyungwoo Lim
We determine carbon accumulation in response to 35-years tree nutrition optimization. Tree nutrition has been administrated based on annual foliar nutrient detection and corresponding fertilization treatment. Aboveground carbon accumulation is determined by standing biomass and belowground carbon accumulation is determined by both soil carbon stock and root biomass. Based on litterfall production and consecutive measurements on tree dimensions, annual net primary production is estimated.
[ID: 64] Impact of nutrition and climate change on the structure and function of boreal coniferous forests
PI: Sune Linder
Long-term studies of the effects of optimised fertilisation (Flakaliden) and nitrogen addition (Rosinedal) on the structure and function of boreal forests.Projects at these sites range from microbiology to forest management.