Stomatal control, tree water relations and photosynthesis modelling.

My PhD project focuses on the theory of stomatal control and gas exchange in trees. I've been developing a new theoretical framework for stomatal control functions and trying it out using the land surface model JSBACH. I'm also part of the micrometeorology group at INAR / Physics.


Ecosystem ecology, Carbon and Nitrogen budgets of forest - peatland ecotone, Tropospheric ozone

I am studying the effects of drought on CO2, CH4, and N2O dynamics along a boreal forest/mire ecotone. The ecotone is an ecological tension between habitats. In forest/mire transition, below-ground features of poorly drained peatlands overlap with the above-ground features of well drained forests.

Greenhouse gas dynamics of forest/mire transitions are poorly known, because of the relatively narrow extent between forests and peatlands. Although in the scale of boreal forest, the forest/mire transition covers large areas. For example in Finland the forest/mire transition covers approximately 3.1 Million ha, or 14 % of the total forest area.

  • +358 (0)45 1310 513
  • Viikki, B building room 441
  • ORCID: 
  • More information in research database TUHAT

Forest fires in the boreal zone

I am looking into the various short and long-term effects of forest fires on soil carbon and greenhouse gas fluxes in different regions of the boreal biome.

Xylem, nutrition, tree growth modelling

Focused on the height growth decline of old-growth trees, my research centralizes on the hydraulic dynamics and nutrition conditions of the predominant tree species of Finland. Both field measurements and laboratory means are employed in my studies, yet in mathematics I the most trust.

Tree ecophysiology, hydraulic conductance, root systems, drought stress

I am now focusing on the hydraulic conductance of the Scots pine root system, especially effects of the root length on hydraulic properties. In addition, i will cover the implication of hydraulic conductance of the root systems for the distribution of soil water and modeling draught.

My research project focuses on the biogeochemical and biophysical feedbacks from forest harvesting. More specifically I study the impact of forest management in tree physiology and the tree-soil interactions in different soil conditions. 


Leaf stress relations to optical properties

In my PhD thesis, I focus on improving ways of measuring plant physiological processes through optical means. More specifically the aim is to create a new low-cost sensor for fluorescence imaging and to link the leaf level measurements to canopy level measurements done with drones.


Nitrogen cycling in boreal forests, open science

My research interest is in the interactions between forest plants, forest soil and the atmosphere. Functional balance of trees and elemental mass balances are fundamental concepts in my research. As a special topic, I am working on how to improve the reliability of chamber measurement techniques. Recently, my work has been concentrating more and more on open science and the intersection between the Arts and Science.

Tree root carbon dynamics in boreal forests

My research interests are tree root carbon dynamics in boreal forest ecosystems. The aim of my research is to quantify and model carbon-related processes of Scots pine roots in the framework of whole tree carbon balance and estimate tree carbon dynamics in the chancing climate.



Forest Biomass and Carbon Sequestration, Forest ecosystem modelling

  • +358 (0)2 941 58647
  • kourosh.kabiri [at]
  • Viikki, B building room 321
  • ORCID:
  • More information in research database TUHAT and the Forest Modelling group page

Vegetation and nutrient cycling in subarctic forests

In my doctoral thesis, I study how forests vegetation in the northern latitudes responds to climate change. I approach the topic by analyzing the relationships that the forest vegetation has with a) soil nutrients, and b)  atmosphere.

Tree ecophysiology, xylem and phloem anatomy, tree hydraulics

I want to know, how trees can acclimate to drought and to gain new insight into tree hydraulic architecture. Therefore, I study xylem traits, especially pits, as well as phloem traits in trees grown on sites with different water availability. Also, I want to understand better how structure and function are coupled and will combine hydraulic and anatomical measurements. 


Forest modelling under climate change, remote sensing

My  thesis is working on the process-based modelling on forest under climate change, and also try to combine with remote sensing data to develop on a larger area.

  • Viikki, B building room 519
  • ORCID: 0000-0001-9633-7350
  • More information in research database TUHAT, and Forest Modelling Group page

Forest tree ecophysiology, nutrient balance

My main topic is to study carbohydrate relation with photosynthesis and water transport in boreal woody plants. I am also developing different laboratory protocols, mainly biochemical analyses woody plant material.


Leaf optical properties

During my PhD and as a member of FLUO-SYNTHESIS project, I study the variation in leaf optical properties (absorption, fluorescence and reflectance spectra) across species, light gradients and in response to multiple sources of stress.

Sources of methane emissions from trees in boreal forests

Working for the project From Processes to Modelling of Methane Emissions from Trees (MEMETRE).

  • salla.tenhovirta [at]
  • Biokeskus 1, room 4213 (Viikinkaari 9)
  • More information in the webpage of Methane exchange group 
  • +358 504485845
  • Department of Biosciences, Viikinkaari 1 room 6414

  • ORCID: 
  • More information in research database TUHAT

Water relations of coniferous trees, phloem transport, tree gas exchange

I study the tree water and sugar relations with tree gas exchange in my PhD thesis. Currently, with my collegues I study the influence of fungus infection on water transport in Norway spruce, and the progress of belowground hydraulic conductance and stomatal conductance during growing season in Scots pine.

  • +358 (0)50 430 8316
  • Viikki, B building room 521
  • ORCID: 0000-0002-3674-4904
  • More information in research database TUHAT

Drought impacts on plant phloem physiology

I am working as a doctoral student on the physiology of phloem transport. Particularly, I want to study how stress impact carbon and water fluxes inside plant individuals. Previously I worked on provenance/inheritance based plant trait variation and plant invasion physiology. I am generally interested in plant sciences, ecology, biogeography and paleontology.


Soil microbes in permafrost soil