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[ID: 346] Nordic-Baltic workshop on GHG fluxes from managed/restored peatlands

PI: Matthias Peichl

Boreal peatlands provide an important carbon sink and play a key role in the global carbon cycle and climate system. During the past century, >10 million ha of natural peatlands have been drained in the Nordic-Baltic countries with the purpose to increase tree biomass production. Presently, extensive efforts are being undertaken by governmental agencies and forest stakeholders to restore these ecosystems towards their natural state with the aims to enhance conservation values and to reduce greenhouse gas (GHG) emissions from these areas. Despite this high interest and activity level, the empirical knowledge for evaluating the implications on the GHG balance is scarce. As a result, the climate impact of drained and restored peatland areas is currently highly uncertain. This workshop has two main goals: 1) Gather and synthesize the current knowledge on the climate impact of drained and restored peatlands within the Nordic-Baltic domain; 2) Explore the possibilities for synthesis papers and common research proposals.

GHGpeatlandrestoration

[ID: 343] Forest management effects on mobilization of soil carbon to surface waters

PI: Alberto

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.

Forest managementcarbonisotopes

[ID: 336] Downstream propagation of clear cut effects

PI: Maria Myrstener

This project aims to evaluate downstream propagation of clear cut effects with a focus on metabolic rates. We ask whether physical and chemical effects on metabolic rates within clear cuts are propagated to downstream forest streams. We also evaluate whether larger buffer zones within clear cuts can mitigate downstream propagation of clear cut effects.

downstream propagationclear cutmetabolism

[ID: 320] Restored wetlands - Hotspots for methane emission and mercury methylation?

PI: Jacob Smeds

Wetlands are unique ecosystems delivering important ecosystem services to society. Due to extensive drainage only a minor fraction of the original wetland areas still remains in e.g. Europe. During the last decades, wetland restoration has become a prioritized environmental protection action in many European countries. Also the Swedish government has defined wetland restoration as major national undertaking, with numerous authorities and landowners actively involved. The major objectives behind wetland restoration are increased biodiversity, increased carbon sequestration, increased groundwater storage and improved surface water quality. However, wetland restoration also causes fundamental changes in biogeochemical properties and may result in undesired impacts and potential environmental threats. In addition, a century or more of drained conditions has drastically changed the soil properties in relation to natural wetlands and this is likely to profoundly influence the potential for various biogeochemical processes. This renders the impact of restoration on biogeochemical processes difficult to predict. Methane is the second most important green-house gas after carbon dioxide. Another process of grave concern is mercury (Hg) methylation. The overall aim of the project is to identify properties of rewetted wetlands that are critical for methane dynamics (including both production and consumption) and for the transformation of inorganic Hg to elemental gaseous Hg and the toxic MeHg molecule. We will the compare these properties and the associated biogeochemical pathways relative adjacent undisturbed natural wetlands. Understanding these biological systems will be fundamental for developing strategies to minimize emissions of the greenhouse gas methane and concentrations of methyl mercury in ground and surface waters of our landscape following wetland restoration.

WetlandrestorationmethaneHg

[ID: 249] Trollberget regular stream sampling

PI: Eliza Maher Hasselquist

Monitoring of water chemistry in several streams. Sampling twice per week with increased frequency during the spring flood.

stream waterchemistrycatchment

[ID: 240] CATCHMENT SCALE SUSPENDED SEDIMENT EXPORT

PI: Eliza Maher Hasselquist

Question: How does clear-cutting and subsequent ditch cleaning affect the quality and quantity of exported suspended solids (SS) at the catchment scale? Methods: 1. Turbidity logged every 15 minutes during the ice-free season 2. Suspended Sediment grab sample on average 2x per month all year round a. Use SS grab samples to correlate to turbidity and thus have continuous measurements during active times of the year. 3. Time Integrated Mass Flux Sampling (TIMS) during ice-free season – Integrated measure over 2 weeks 4. Ditch characteristics before and after cleaning a. bed material samples b. measurements of particle size distribution of the bed material c. ditch cross sections at 50 m intervals with high res GPS or total station d. ditch depth, bottom width

ditch cleaningdikesrensningwater qualityclear-cut

[ID: 228] Regular stream sampling

PI: Hjalmar Laudon

Monitoring of water chemistry in several streams. Sampling twice per week with increased frequency during the spring flood.

catchmentchemistrystream water

[ID: 221] Post-harvest ditch maintenance effects on the forest carbon balance

PI: Matthias Peichl

We will quantify the impact of post-harvest ditch cleaning on the CO2 exchange of forest clear cuts. Measurements are carried out using two parallel eddy covariance systems in control and treatment area. The study is conducted within the Trollberget clear-cut/DNM experimental sites.

ditch maintenance networkcarbon cycleforest clear cut

[ID: 218] Towards climate-responsible forestry: Assessing the greenhouse gas balances of drained and restored peatland forests in boreal Sweden

PI: Järvi Järveoja

The main goal of this project is to estimate and compare the GHG balances (including CO2 and CH4 exchanges) of drained and restored peatland forests in boreal Sweden. The specific project objectives are to: (1) obtain direct measurements of the full annual ecosystem-scale GHG balance of a drained nutrient-poor peatland forest, (2) determine the impact of restoration activities (i.e. rewetting) on the GHG balance of drained peatland forests, (3) identify the factors that govern the spatio-temporal dynamics of CO2 and CH4 exchanges in drained and restored peatland forests.

restoration of drained peatlandsgreenhouse gas emissionsmanual chambers

[ID: 217] How does rewetting affect the greenhouse gas balance of drained peatland forests in boreal Sweden?

PI: Järvi Järveoja

The overall aim of this project is to investigate how rewetting affects the GHG balance of drained peatland forests in boreal Sweden. This will be achieved by eddy covariance measurements of the ecosystem-scale CO2 and CH4 exchanges in work package 1 (WP1), combined with estimates of spatial variability from plot-scale GHG flux measurements across replicated sites in WP2. In WP3, the separate responses of the individual net CO2 exchange component fluxes will be determined.

eddy covariancegreenhouse gas emissionsrestoration of drained peatlands

[ID: 213] Wetland restoration and its effect on brownification of surface waters

PI: Marcus Wallin

The focus is on the wetland restoration project at Trollberget. Monitoring of ground and stream water will start prior to the operations and last for the full project period. The restored wetlands will be compared with two non-restored wetland catchments in order to detect any effects on water quality. The spatial dimension of the project will be explored by additional sampling (synoptic surveys) of restored and non-restored wetlands over large geographical regions of Sweden. The results will be fundamental for future management and conservation strategies of boreal wetlands and for keeping good water quality of water resources in Sweden.

Water qualityforest managementaquatic carbon export