I am a plant ecophysiologist at The Department of Forestry and Wood Technology, where I hold an associated professorship (with tenure) in forestry. I have received a M.S. in Biology from Lund University, and a Ph.D. in Forest Management from Swedish University of Agricultural Sciences.
Currently, I am teaching (or co-teaching) the following undergraduate courses: Sustainable small-scale forestry I; Broadleaved and utilization; and Silviculture. Further, I am supervising B.S. and M.S theses within my research area.
In my research I use a variety of field and laboratory techniques to understand and predict how woody plants are impacted by changes in the environment. Specifically, I work at leaf-, shoot- and plant-level to investigate individual plants' capacity to tolerate abiotic and biotic stresses. It is thus directly linked to forest survival, growth and production. Currently, I am involved in several projects including (1) Leaf CO2 reassimilation as a function of mesophyll conductance; and (2) Management of deciduous forest stands for biodiversity and biofuel based at University of Gothenburg, where I study oak regeneration questions. For more information see below.
Reassimilation of CO2 in leaves across multiple woody species as a function of mesophyll conductance
Sequestration of carbon by forest trees is a significant process in mitigation of global climate change effects, caused by increased atmospheric CO2. It is also a necessity for production of woody biomass for the needs of the future bioeconomy. However, we still do not fully understand the fate of CO2 molecules inside the leaves. The purpose of this project is, to quantify effects of leaf mesophyll conductance (gm) on the internal CO2 reassimilation probability, across multiple woody species and forest ecosystems. In addition, we are exploring links between reassimilation, gm and abiotic/biotic processes that influence mesophyll structures and development (leaf developmental stage, canopy position and influence of fugal endophytes). 2016 - on-going Supported: VR
Effects of interspecific competition from surrounding mixed vegetation on growth, mortality and stem development in oaks
Indirect facilitation by neighboring woody understory may function as a cost-effective and sustainable way to regenerate oaks. However, we don't know if how this competition affects plant growth and quality. In this project, we look at competitive affects from herbaceous and woody vegetation on survival, growth, canopy development and stem quality in oak (Quercus robur) in an open-field experiment in southern Sweden. Oaks were grown in four different competition treatments: no competing vegetation, with herbaceous vegetation with woody vegetation, and with both herbaceous and woody vegetation. 2007 - on-going
Article in journal (Refereed)
- Jensen, A.M., Eckert, D., Carter, K.R., Persson, M., Warren, J.M. (2021). Springtime Drought Shifts Carbon Partitioning of Recent Photosynthates in 10-Year Old Picea mariana Trees, Causing Restricted Canopy Development. Frontiers in Forests and Global Change. 3. 1-15.
- Warren, J.M., Jensen, A.M., Ward, E.J., Guha, A., Childs, J., et al. (2021). Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland. Global Change Biology.
- Petersson, L., Löf, M., Jensen, A.M., Chastain, D.R., Gardiner, E. (2020). Sprouts of shoot-clipped oak (Quercus alba and Q. robur) germinants show morphological and photosynthetic acclimation to contrasting light environments. New forests. 51. 817-834.
- Eckert, D., Jensen, A.M., Gu, L. (2020). The maximum carboxylation rate of Rubisco affects CO2 refixation in temperate broadleaved forest trees. Plant physiology and biochemistry (Paris). 155. 330-337.
- Kumarathunge, D.P., Medlyn, B.E., Drake, J.E., Tjoelker, M.G., Aspinwall, M.J., et al. (2019). Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale. New Phytologist. 222. 768-784.
- Jensen, A.M., Warren, J.M., King, A.W., Ricciuto,, D.M., Hanson, P.J., et al. (2019). Simulated projections of boreal forest peatland ecosystem productivity are sensitive to observed seasonality in leaf physiology. Tree Physiology. 39. 556-572.
- Furze, M.E., Jensen, A.M., Warren, J., Richardson, R. (2018). Seasonal patterns of nonstructural carbohydrate reserves in four woody boreal species. Journal of the Torrey Botanical Society. 145. 332-339.
- Jensen, A.M., Löf, M. (2017). Effects of interspecific competition from surrounding vegetation on mortality, growth and stem development in young oaks (Quercus robur). Forest Ecology and Management. 392. 176-183.
- Norby, R.J., Gu, L., Haworth, I.C., Jensen, A.M., Turner, B.L., et al. (2017). Informing models through empirical relationships between foliar phosphorus, nitrogen and photosynthesis across diverse woody species in tropical forests of Panama. New Phytologist. 215. 1425-1437.
- Griffiths, N.A., Hanson, P.J., Ricciuto, D.M., Iversen, C.M., Jensen, A.M., et al. (2017). Temporal and Spatial Variation in Peatland Carbon Cycling and Implications for Interpreting Responses of an Ecosystem-Scale Warming Experiment. Soil Science Society of America Journal. 81. 1668-1688.
- Götmark, F., Götmark, E., Jensen, A.M. (2016). Why Be a Shrub? : a Basic Model and Hypotheses for the Adaptive Values of a Common Growth Form. Frontiers in Plant Science. 7.
- Warren, J.M., Jensen, A.M., Medlyn, B.E., Norby, R.J., Tissue, D.T. (2015). Carbon dioxide stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment. AoB Plants. 7.
- Hao, M., Jensen, A.M., Boquist, A., Liu, Y., Rasmusson, A.G. (2015). The Ca2+-Regulation of the Mitochondrial External NADPH Dehydrogenase in Plants Is Controlled by Cytosolic pH. PLoS ONE. 10.
- Jensen, A.M., Warren, J.M., Hanson, P., Childs, J., Wullschleger, S. (2015). Needle age and season influence photosynthetic temperature response and total annual carbon uptake in mature Picea mariana trees. Annals of Botany. 116. 821-832.
- Sun, Y., Gu, L., Dickinson, R.E., Pallardy, S.G., Baker, J., et al. (2014). Asymmetrical effects of mesophyll conductance on fundamental photosynthetic parameters and their relationships estimated from leaf gas exchange measurements. Plant, Cell and Environment. 37. 978-994.
- Löf, M., Bolte, A., Jacobs, D.F., Jensen, A.M. (2014). Nurse Trees as a Forest Restoration Tool for Mixed Plantations: Effects on Competing Vegetation and Performance in Target Tree Species. Restoration Ecology. 22. 758-765.
- Jensen, A.M., Götmark, F., Löf, M. (2012). Shrubs protect oak seedlings against ungulate browsing in temperate broadleaved forests of conservation interest : a field experiment. Forest Ecology and Management. 266. 187-193.
- Drößler, L., Attocchi, G., Jensen, A.M. (2012). Occurrence and management of oak in southern Swedish forests. Forstarchiv. 83. 163-169.
- Jensen, A.M., Löf, M., Witzell, J. (2012). Effects of competition and indirect facilitation by shrubs on Quercus robur saplings. Plant Ecology. 213. 535-543.
- Jensen, A.M., Gardiner, E., Vaughn, K.C. (2012). High-light acclimation in Quercus robur L. seedlings upon over-topping a shaded environment.. Environmental and Experimental Botany. 78. 25-32.
- Jensen, A.M., Löf, M., Gardiner, E. (2011). Effects of above- and below-ground competition from shrubs on photosynthesis, transpiration and growth in Quercus robur L. seedlings. Environmental and Experimental Botany. 71. 367-375.
- Götmark, F., Schott, K.M., Jensen, A.M. (2011). Factors influencing presence-absence of oak (Quercus spp.) seedlings after conservation-oriented partial cutting of high forests in Sweden. Scandinavian Journal of Forest Research. 26. 136-145.
Chapter in book (Refereed)
- Löf, M., Brunet, J., Hickler, T., Birkedal, M., Jensen, A.M. (2012). Restoring broadleaved forests in southern Sweden as climate changes. A Goal-Oriented Approach to Forest Landscape Restoration. Springer. 373-391.
Doctoral thesis, comprehensive summary (Other academic)
- Jensen, A.M. (2011). Effects of facilitation and competition on oak seedlings : Using shrubs as nurse-plants to facilitate growth and reduce browsing from large herbivores. Doctoral Thesis. Alnarp, Sveriges Lantbruksuniversitet. 42.