Summary
Young saplings of Pinus sylvestris were fumigated for 3 months with ammonia in concentrations ranging from 0 to 240 μg m-3. Despite the much higher concentrations than normal in the field, no visible damage occurred. Photosynthesis, dark respiration, transpiration and biomass production were stimulated. At 240 μg m-3 with high irradiance (PAR: 950 μmol m-2 s-1), net photosynthesis was stimulated by 24% and dark respiration by 76%. Intitial light use efficiency was not significantly affected. Transpiration increased, both in the dark and at 950 μmol m-2 s-1 by 40% and 57%, respectively. In the presence of ammonia, stomatal control was less efficient. Though growth of roots was not affected by NH3, that of current year needles was stimulated, resulting in an increased mass ratio of needles to roots. The nitrogen content of the needles increased, but the contents of other mineral components did not change significantly. Due to increased transpiration per unit of needle area and increased mass of needles per tree, water loss per tree was about twice as high in the treatment with 240 μg m-3 as in the control. Towards the end of fumigation, a 10-day period without water supply followed and then the water potential of the shoots was measured as an indicator of water demand. This demand was higher with higher concentrations of NH3, suggesting a higher risk of injury from drought.
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Van der Eerden, L.J.M., Perez-Soba, M.G.F.J. Physiological responses of Pinus sylvestris to atmospheric ammonia. Trees 6, 48–53 (1992). https://doi.org/10.1007/BF00224499
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DOI: https://doi.org/10.1007/BF00224499