Anna Jensen

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.

Teaching

Currently, I am teaching (or co-teaching) the following undergraduate courses:

Further, I am supervising B.S. and M.S. theses within my research area.

Research

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.

Ongoing research

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

Anna M. Jensen

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

My research groups

My ongoing research projects

Publications

Article in journal (Refereed)

Eckert, D., Martens, H.J., Gu, L., Jensen, A.M. (2021). CO₂ refixation is higher in leaves of woody species with high mesophyll and stomatal resistances to CO₂ diffusion. Tree Physiology. 41 (8). 1450-1461.
Status: Published
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.
Status: Published
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. 27. 1820-1835.
Status: Published
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.
Status: Published
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.
Status: Published
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 (2). 768-784.
Status: Published
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 (4). 556-572.
Status: Published
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 (4). 332-339.
Status: Published
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.
Status: Published
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 (4). 1425-1437.
Status: Published
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 (6). 1668-1688.
Status: Published
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.
Status: Published
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 (5). 821-832.
Status: Published
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.
Status: Published
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 (9).
Status: Published
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 (4). 978-994.
Status: Published
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 (6). 758-765.
Status: Published
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.
Status: Published
Drößler, L., Attocchi, G., Jensen, A.M. (2012). Occurrence and management of oak in southern Swedish forests. Forstarchiv. 83 (5). 163-169.
Status: Published
Jensen, A.M., Löf, M., Witzell, J. (2012). Effects of competition and indirect facilitation by shrubs on Quercus robur saplings. Plant Ecology. 213 (4). 535-543.
Status: Published
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.
Status: Published
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 (3). 367-375.
Status: Published
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 (2). 136-145.
Status: Published

Book (Refereed)

Jensen, A.M., Malmqvist, C. (2019). Att mäta skog. Lund, Studentlitteratur AB.

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.

Article, review/survey (Refereed)

Ræbild, A., Anamthawat-Jónsson, K., Egertsdotter, U., Immanen, J., Jensen, A.M., et al. (2024). Polyploidy – A tool in adapting trees to future climate changes? A review of polyploidy in trees. Forest Ecology and Management. Elsevier. 560. 121767-121767.
Status: Published

Article in journal (Other academic)

Jensen, A.M. (2023). Pushing the thermal limit for cacao-will we have chocolate also in a warmer future?. Tree Physiology. 43 (12). 2047-2049.
Status: Published

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.