A5033119496- Forest Management and Policy
- Forest ecology and management
- Plant Water Relations and Carbon Dynamics
- Remote Sensing and LiDAR Applications
- Peatlands and Wetlands Ecology
- Hydrology and Watershed Management Studies
- Atmospheric and Environmental Gas Dynamics
- Forest Ecology and Biodiversity Studies
- Tree-ring climate responses
- Fire effects on ecosystems
- Remote Sensing in Agriculture
- Land Use and Ecosystem Services
- Horticultural and Viticultural Research
- Soil Geostatistics and Mapping
- Species Distribution and Climate Change
- Environmental Impact and Sustainability
- Cryospheric studies and observations
- Social Acceptance of Renewable Energy
- demographic modeling and climate adaptation
- Statistical Methods and Bayesian Inference
- 3D Modeling in Geospatial Applications
- Urban Stormwater Management Solutions
- Soil Carbon and Nitrogen Dynamics
- Geological Modeling and Analysis
- Sustainability and Climate Change Governance
University of Helsinki
2015-2023
University of Central Oklahoma
2021
Oklahoma Biological Survey
2021
University of Oklahoma
2021
Oklahoma State University
2021
University of Lisbon
2012-2013
UK Centre for Ecology & Hydrology
2013
University of Edinburgh
2010
Forest Research
2010
Abstract Tree mortality is a key factor influencing forest functions and dynamics, but our understanding of the mechanisms leading to associated changes in tree growth rates are still limited. We compiled new pan‐continental tree‐ring width database from sites where both dead living trees were sampled (2970 4224 190 sites, including 36 species), compared early recent between that died those survived given event. observed decrease radial before death ca. 84% events. The extent duration these...
Accurate modelling of drought-induced mortality is challenging. A steady-state model presented integrating xylem and phloem transport, leaf-level gas exchange plant carbohydrate consumption during drought development. Bayesian analysis parameter uncertainty based on expert knowledge a literature review carried out. The tested by combining six data compilations covering 170 species using information sensitivities conductivity, stomatal conductance leaf turgor to water potential. possible...
The response of forest productivity to climate extremes strongly depends on ambient environmental and site conditions. To better understand these relationships at a regional scale, we used nearly 800 observation years from 271 permanent long-term monitoring plots across Switzerland, obtained between 1980 2017. We assimilated data into the 3-PG ecosystem model using Bayesian inference, reducing bias predictions 14% 5% for stem carbon stocks 45% 9% stock changes. then estimated forests...
Policy-relevant forest models must be environment and management sensitive provide unbiased estimates of predicted variables over their intended areas application. While empirical derive structure parameters from representative data sets, process-based model (PBM) should evaluated in ranges that have a biological meaning independently output data. At the same time PBMs calibrated against observations order to obtain an understanding predictive capability. By means assimilation, we Bayesian...
Forest models are instrumental for understanding and projecting the impact of climate change on forests. A considerable number forest have been developed in last decades. However, few systematic comprehensive model comparisons performed Europe that combine an evaluation modelled carbon water fluxes structure. We evaluate 13 widely used, state-of-the-art, stand-scale against field measurements structure eddy-covariance data over multiple decades across environmental gradient at nine typical...
Abstract Forest management methods and harvest intensities influence wood production, carbon sequestration biodiversity. We devised different scenarios by means of stakeholder analysis incorporated them in the forest growth simulator PREBAS. To analyse impacts intensity, we used constraints on total harvest: business as usual, low harvest, intensive no harvest. carried out simulations a wall-to-wall grid Finland until 2050. Our objectives were to (1) test how differed their projections, (2)...
The pressure to increase forest and land carbon stocks simultaneously with increasing based biomass harvest for energy materials emphasizes the need dedicated analyses of impacts possible trade-offs between these different mitigation options including also related biophysical factors, surface albedo formation biogenic Secondary Organic Aerosols (SOA). We analyzed change in global radiative forcing (RF) due changes climatic agents as affected by state Finnish forests under increased or...
Tree mortality is a key process shaping forest dynamics. Thus, there growing need for indicators of the likelihood tree death. During last decades, an increasing number tree-ring based studies have aimed to derive growth-mortality functions, mostly using logistic models. The results these studies, however, are difficult compare and synthesize due diversity approaches used sampling strategy (number characteristics alive death observations), type explanatory growth variables included (level,...
Boreal forests provide an array of ecosystem services. They regulate climate in relation with carbon, water and nutrient fluxes. Forests renewable raw material, food, recreational possibilities. Rapid warming projected for the boreal zone may change provision these We demonstrate model based estimates present future services related to carbon cycling forests. The were derived from biophysical variables calculated by two dynamic models. Future changes driven scenarios obtained as results a...
Abstract Key message Tree structure equations derived from pipe model theory (PMT) are well-suited to estimate biomass allocation in Scots pine ( Pinus sylvestris L.) and Norway spruce Picea abies [L.] Karst.). However, age dependence of parameters should be accounted for when applying the equations. Context Pipe theory-based (PMT-based) have been incorporated many process-based models. more data concerning old-growth trees is needed test reliability generality Aims This study (1) tested...
The EU aims at reaching carbon neutrality by 2050 and Finland 2035. We integrated results of three spatially distributed model systems (FRES, PREBAS, Zonation) to evaluate the potential reach this goal both national regional scale in Finland, simultaneously considering protection targets biodiversity (BD) strategy. Modelling anthropogenic emissions forestry measures were carried out, forested areas important for BD identified based on spatial prioritization. used scenarios until mitigation...
The challenges posed by climate change and biodiversity loss are deeply interconnected. Successful co-managing of these tangled drivers requires innovative methods that can prioritize target management actions against multiple criteria, while also enabling cost-effective land use planning impact scenario assessment. This paper synthesises the development application an integrated multidisciplinary modelling evaluation framework for carbon in forest systems. By analysing spatio-temporally...
Bayesian statistics is becoming increasingly common in the environmental sciences because of developments computers and sampling-based techniques for parameter estimation. However, use approach still limited forest research, especially models with many parameters. Some studies have used screening to make calibration a computationally expensive model possible. In this paper we introduce new methodology screening, based on canonical correlation analysis. Furthermore show how impacts...
Abstract Applications of ecosystem flux models on large geographical scales are often limited by model complexity and data availability. Here we calibrated evaluated a semi‐empirical model, PREdict Light‐use efficiency, Evapotranspiration Soil water (PRELES), for various forest types climate conditions, based eddy covariance from 55 sites. A Bayesian approach was adopted calibration uncertainty quantification. We applied the site‐specific calibrations multisite to nine plant functional...
Adding nitrogen to boreal forest ecosystems commonly increases gross primary production (GPP). The effect of addition on ecosystem GPP is convoluted due the impacts and interactions among leaf scale photosynthetic productivity, canopy structure, site fertility, environmental constraints. We used a unique controlled fertilisation experiment combined with eddy covariance measurements calibration LUE-based (light use efficiency) model in order reveal differences capacity addition.A...
Uncertainties are essential, yet often neglected, information for evaluating the reliability in forest carbon balance projections used national and regional policy planning. We analysed uncertainties net biome exchange (NBE) stocks under multiple management climate scenarios with a process-based ecosystem model. Sampled initial state values, model parameters, harvest levels global models (GCMs) served as inputs Monte Carlo simulations, which covered forests of 18 regions mainland Finland...
Abstract. Forest ecosystems are already responding to changing environmental conditions that driven by increased atmospheric CO2 concentrations. These developments affect how societies can utilise and benefit from the woodland areas in future, be it for example climate change mitigation as carbon sinks, lumber wood industry, or preserved nature tourism recreational activities. We assess effect relative magnitude of different uncertainty sources ecosystem model simulations year 1980 2100 two...