Studies on the dry deposition of NO2 to coniferous species at low NO2 concentrations

Abstract

Measurements of the deposition of NO2 to seedlings of Scots pine and Norway spruce at ppbv and sub ppbv levels were made in the laboratory using a flow through chamber technique. The results show that NO2 deposition at air concentrations above 1 ppbv was governed by stomatal uptake. The possible influence of other factors controlling the NO2 deposition was also explored. Mean NO2 compensation points for both Scots pine and Norway spruce were lower than 0.2 ppbv, which can be considered negligible. Throughout the experiments, there was no evidence of internal resistance to NO2 uptake by the seedlings. At low NO2 concentrations (0.2–1 ppbv), the NO2 flux was generally below the detection limit of the technique.

Stomatal uptake and cuticular adsorption contribute to dry deposition of NH3 and NO2 to needles of adult spruce (Picea abies) trees

“…0.9 nmol mol −1 Hereid & Monson, 2001) and for Scots pine and Norway spruce at less N exposed sites in Sweden ( c . 0.1–0.7 nmol mol −1 ; Rondón et al ., 1993; Rondón & Granat, 1994). This difference between individuals of the same species growing at different sites can be due to the excess N supply of the spruce at the field site studied, as indicated by high leaf N contents (Geßler et al ., 1998a), which are known to increase NO 2 compensation point (Sparks et al ., 2001).…”

Stable isotope analysis reveals differential effects of soil nitrogen and nitrogen dioxide on the water use efficiency in hybrid poplar leaves

“…Other studies report values between < 0.1 nl l −1 for young beech seedlings (Gessler et al . 2000) and 0.2 nl l −1 for pine and spruce seedlings (Rondon & Granat, 1994), up to 1.6 nl l −1 for Picea abies (Thoene et al. , 1996) and 1.8 nl l −1 for Fagus sylvatica (Gessler et al .…”

Estimating the uptake of traffic-derived NO 2 from 15 N abundance in Norway spruce needles

“…NO 2 taken up by the needles is transformed into amino acids Nussbaum et al 1993). The total uptake rates are linearly related to stomatal conductance, although there is still some discussion about possible internal resistance to NO 2 uptake at very low concentrations (Thoene et al 1991;Ramge et al 1993;Rondon and Granat 1994).…”