Uptake and assimilation of atmospheric NO2 — N by spruce needles (Picea abies): A field study

Ammann, Markus; von Ballmoos, Peter; Stalder, Michael; Suter, Marianne; Brunold, Christian (1995). Uptake and assimilation of atmospheric NO2 — N by spruce needles (Picea abies): A field study. Water, Air, & Soil Pollution, 85(3), pp. 1497-1502. Springer 10.1007/BF00477193

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NO2 enters spruce needles by gas exchange through the slomata. Nitrate formed from NO2 is reduced in the cytosol by nitrate reductase (NR), the rate limiting enzyme of the nitrogen assimilatory pathway. A linear relationship was found between the nitrate reductase activity (NRA), NO2 concentration and the amount of N incorporated into amino acids and proteins, so that NRA was suggested as an estimate of NO2-uptake. In the present field study, 50 spruce trees (Picea abies) have been selected, which grow in a natural habitat in a NO2 concentration gradient in a forest crossed by a highway which is a major NO source. At part of the sites, the microclimatic conditions have been recorded, so that common models of local gas exchange of the needles could be used to estimate stomatal uptake of NO2. NRA was investigated as a function of radiation and stomatal uptake on the day before needle sampling. Close to the highway NRA was permanently elevated with a maximum in summer. As with the laboratory results, a linear relationship between stomatal uptake and NRA was found. Total N — content of current year shoots was not affected by the additional N-source provided by airborne NO2. The present study shows that the gas exchange models are consistent with the physiological reactions of spruce needles on a local level and therefore contribute to the validation of calculations of NO2 dry deposition to spruce forests.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Stress Physiology (discontinued)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Ammann, Markus; von Ballmoos, Peter; Suter, Marianne and Brunold, Christian

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0049-6979

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

16 Nov 2016 12:22

Last Modified:

14 Nov 2017 16:30

Publisher DOI:

10.1007/BF00477193

Uncontrolled Keywords:

NO2, dry deposition, gas exchange, picea abies, spruce forests, nitrate reductase, nitrogen assimilation

BORIS DOI:

10.7892/boris.89782

URI:

https://boris.unibe.ch/id/eprint/89782

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