UPTAKE AND ASSIMILATION OF ATMOSPHERIC NO2-N BY SPRUCE NEEDLES (PICEA-ABIES) - A FIELD-STUDY

NO2 enters spruce needles by gas exchange through the stomata. Nitrate formed from NO2 is reduced in the cytosol by nitrate reductase (NR), the rate limiting enzyme of the nitrogen assimilatory pathway. A linea r relationship was found between the nitrate reductase activity (NRA) NO2 concentration and the amount of N incorporated into amino acids an d proteins, so that NRA was suggested as an estimate of NO2-uptake. In the present field study, 50 spruce trees (Picea abies) have been sele cted, 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 o f the sites, the microclimatic conditions have been recorded, so that common models of local gas exchange of the needles could be used to es timate stomatal uptake of NO2. NRA was investigated as a function of r adiation 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 t he physiological reactions of spruce needles on a local level and ther efore contribute to the validation of calculations of NO2 dry depositi on to spruce forests.