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John D Marshall
Carbon and water flow through forests, through physiological branchpoints, which determine how soils form, how trees grow, and the chemistry of the atmosphere. We study photosynthesis, respiration, and how sugars move around inside the tree. Likewise, the movement of water, its evaporation from the leaves, and its uptake by the root system, are all important as we try to understand the "mechanics" of trees. These measurements become really powerful when they are used to build budgets, which provide us with a clear vision of the invisible processes that control how forests work.
Teaching
Guest lectures
Research
Nitrogen effects on the carbon budget of a boreal Scots pine forest
Pulse-labelling of soil water and its flux through a Scots pine forest
Compartmental fluxes of carbon in a boreal Scots pine forest
Seasonal variation in Scots pine mesophyll conductance in mature, field-grown, Scots pine trees
Estimation of canopy photosynthesis from stable carbon isotopes and sap flow
Use of eddy covariance and stable isotope analysis to infer the components of canopy gas-exchange in a boreal Scots pine forest
Background
B.S. Forestry, Michigan State University, 1978
M.S. Forest Soils, Michigan State University, 1980
Ph.D. Tree Physiology, Oregon State University, 1984
Selected publications
103. Du, E., Link, T.E., Wei, L., Marshall, J.D., 2016. Evaluating hydrologic effects of spatial and temporal patterns of forest canopy change using numerical modelling. Hydrol. Process. 30:217-231.
104. Henriksson, N., Tarvainen, L., Lim, H., Tor-Ngern, P., Palmroth, S., Oren, R., Marshall, J., Näsholm, T., 2015. Stem compression reversibly reduces phloem transport in Pinus sylvestris trees. Tree Physiol. 35:1075-1085.
105. Hasselquist, N.J., Metcalfe, D.B., Marshall, J.D., Lucas, R.W., Högberg, P. 2016. Seasonality and nitrogen supply modify carbon partitioning in understory vegetation of a boreal coniferous forest. Ecology 97:671-683.
106. Voelker, S.; Brooks, R.; Meinzer, F.; Anderson, R.; Bader, M.; Battipaglia, G.; Becklin, K.; Beerling, D.; Bert, D.; Betancourt, J.; Dawson, T.E.; Domec, J.-C.; Guyette, R.; Koerner, C.; Leavitt, S.W.; Linder, S.; Marshall, J.D.; Mildner, M.; Ogée, J.; Panyushkina, I.; Plumpton, H.; Pregitzer, K.; Saurer, M.; Smith, A.; Siegwolf, R.; Stambaugh, M.; Talhelm, A.; Tardif, J.; Van de Water, P.; Ward, J.; Wingate, L.. 2016. A dynamic leaf gas-exchange strategy is conserved in woody plants under changing ambient CO2: evidence from carbon isotope discrimination in paleo and CO2 enrichment studies. Global Change Biology 22:889-902.
107. Ehlers, I., Augusti, A., Betson, T., Nilsson, M.B., Marshall, J.D., Schleucher, J. 2016, Detecting long-term metabolic shifts using isotopomers: CO2-driven suppression of photorespiration in C3 plants over the 20th century. Proc. Nat. Acad. Sci. 112:15585–15590.
108. Pinto, J.R., Marshall, J.D., Dumroese, R.K., Davis, A.S., Cobos, D.R., 2016. Seedling establishment and physiological responses to temporal and spatial soil moisture changes. New For. 47, 223–241. doi:10.1007/s11056-015-9511-7.
109. Jocher, G., Ottosson Löfvenius, M., De Simon, G., Hörnlund, T., Linder, S., Lundmark, T., Marshall, J.D., Nilsson, M.B., Näsholm, T., Tarvainen, L., Öquist, M., and Peichl, M. . 2017. Apparent winter CO2 uptake by a boreal forest due to decoupling. Ag. For. Meteorol. 232:23-34.
110. Wei, L., Link, T.E., Hudak, A.T., Marshall, J.D., Kavanagh, K.L., Abatzoglou, J.T., Zhou, H., Pangle, R.E., and Flerchinger, G.N. 2016. Simulated water budget of a small forested watershed in the continental/maritime hydroclimatic region of the United States. Hydrol. Process. 30:2000-2013.
111. Tarvainen,, L., Wallin, G., Lim, H. Linder, S., Oren, R., Ottosson Löfvenius, M., Räntfors, M., Tor-ngern, P.,Marshall, J. In press. Photosynthetic refixation varies along the stem and reduces CO2 efflux in mature boreal Pinus sylvestris trees. Tree Physiology.