• Ei tuloksia

Effects of biomass utilization on the carbon balance of Finnish forests

N/A
N/A
Info
Lataa
Protected

Academic year: 2022

Jaa "Effects of biomass utilization on the carbon balance of Finnish forests"

Copied!
1
0
0

Kokoteksti

(1)

Geophysical Research Abstracts Vol. 17, EGU2015-13237, 2015 EGU General Assembly 2015

© Author(s) 2015. CC Attribution 3.0 License.

Effects of biomass utilization on the carbon balance of Finnish forests

Risto Sievänen, Olli Salminen, and Maarit Kallio Natural Resources Institute Finland (risto.sievanen@luke.fi)

The boreal forests cover three fourths of the land area of Finland. About 80 per cent of the total forest area is managed for commercial forestry. The forests produce timber for wood processing and pulp and paper industries and provide also bioenergy. The harvests of timber vary depending on demand of products of forest industry; the harvest level has been on average about 70 per cent of growth in recent years. The utilization of forest biomass is therefore the most important factor affecting the carbon balance of Finnish forests.

We made projections of carbon balance of Finnish forests during 2012-2050 based on scenarios of timber and bioenergy demands. To assess the changes in carbon stock of forests, we combined three models: a large-scale forestry model, the soil carbon model Yasso07 for mineral soils, and a method based on emission factors for peatland soils. We considered two harvest scenarios based on the recent projections of plausible levels (min, max) of timber demand. For the bioenergy demand, we compared cases in which the wood energy use was low or high.

In the past decades, the Finnish forests have been a steadily growing and substantial carbon sink. Its size has been more than 40% of the national GHG emissions during 1990-2012. The planned use of wood from the forests to forest and energy industry does not threaten the increasing trend of the forest sink; with the lowest use of forest biomass the sink may even match the national GHG emissions until 2050.

The stock change of trees is the most important component of carbon balance of forests; it accounts for approximately 80 % of the total stock change. Trees and mineral soils act as carbon sinks and the drained peatland soils as a carbon source. By comparing the scenarios of wood energy use we conclude that the amount of carbon emissions avoided by replacing fossil fuels with stemwood is outweighed by the loss in carbon sequestration.

Viittaukset

LIITTYVÄT TIEDOSTOT

We then outline the mechanistic Munch theory of carbon translocation and formulate a simpler mechanistic model of allocation in three stages: for a simple plant without stem, for a

The objective is to estimate the carbon reservoirs of trees, of the soil of closed forests growing on inorganic soils (here referred to as "forest soil"), and of peat- lands;

In European forests, carbon storage has increased uninterruptedly during the last 60 years, but the contribution of multiple factors affecting the carbon dynamics is not clear.

In this study, 1) a model to estimate soil carbon dioxide (CO 2 ) balance for forestry-drained peatlands was tested on site and countrywide levels in Finland. 3) The current

The main goal of this study is to evaluate a climate-sensitive process-based summary model approach for estimating forest growth and carbon fluxes in the Finnish

Model parameterisation and testing the total carbon stock estimates of the YASSO model in Study I used total soil carbon measurements of the carbon in the organic layer

The increase in global temperature has been attributed to increased atmospheric concentrations of greenhouse gases (GHG), mainly that of CO 2. The threat of severe and complex

Estimates of carbon stores for individual bogs Using the mean carbon density for 50 cm layers and the surface area for each layer, derived from the 3-D model of peat depth, the