Studies on the dry deposition of NO&lt;sub&gt;2&lt;/sub&gt; to coniferous
                        species at low NO&lt;sub&gt;2&lt;/sub&gt; concentrations

Rondôn, Alberto; Granat, Lennart

doi:10.3402/tellusb.v46i5.15809

Cited by 32 publications

(21 citation statements)

References 7 publications

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“…219 and Rennenberg 1996). The range of NO 2 compensation points measured for leaves in this study (0.52-1.60 ppbv) is comparable to the value of 1.15 ppbv reported in a past study of wheat leaves and 1.60-1.90 in beech trees (Gessler et al 2000;Kaplan et al 1988), but is somewhat higher than the range reported for coniferous trees (0.1-0.7 ppbv; Rondon et al 1993;Rondon and Granat 1994). NO 2 compensation points were generally related to leaf N concentration with the highest compensation points corresponding to the highest leaf N concentrations (Table 1).…”

Section: Discussionsupporting

confidence: 49%

“…1) that NO 2 uptake rates are substantial in tropical forest trees and that there is variation among species in their ability to take up or emit NO 2 . At NO 2 concentrations above the compensation point, the average uptake rate for NO 2 was similar in magnitude to that reported for other plant species (Hanson and Lindberg 1991;Okano et al 1986;Weber and Rennenberg 1996), but the maximum uptake rates we recorded (>1000 pmol m -2 s -1 ) were somewhat higher than those reported for temperate trees (Ammann et al 1995;Rondon et al 1993;Rondon and Granat 1994;Thoene et al 1996).…”

Section: Discussioncontrasting

confidence: 37%

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Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest: implications for tropospheric chemistry

et al. 2001

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Tropical forest soils are known to emit large amounts of reactive nitrogen oxide compounds, often referred to collectively as NO y (NO y = NO + NO 2 + HNO 3 + organic nitrates). Plants are known to assimilate and emit NO y and it is therefore likely that plant canopies affect the atmospheric concentration of reactive nitrogen compounds by assimilating or emitting some fraction of the soil-emitted NO y . It is crucial to understand the magnitude of the canopy effects and the primary environmental and physiological controls over NO y exchange in order to accurately quantify regional NO y inventories and parameterize models of tropospheric photochemistry. In this study we focused on nitrogen dioxide (NO 2 ), which is the component of NO y that most directly catalyzes the chemistry of O 3 dynamics, one of the most abundant oxidative species in the troposphere, and which has been reported as the NO y species that is most readily exchanged between plants and the atmosphere. Leaf chamber measurements of NO 2 flux were measured in 25 tree species growing in a wet tropical forest in the Republic of Panama. NO 2 was emitted to the atmosphere at ambient NO 2 concentrations below 0.53-1.60 ppbv (the NO 2 compensation point) depending on species, with the highest rate of emission being 50 pmol m -2 s -1 at <0.1 ppbv. NO 2 was assimilated by leaves at ambient NO 2 concentrations above the compensation point, with the maximum observed uptake rate being 1,550 pmol m -2 s -1 at 5 ppbv. No seasonal variation in leaf NO 2 flux was observed in this study and leaf emission and uptake appeared to be primarily controlled by leaf nitrogen and stomatal conductance, respectively. When scaled to the entire canopy, soil NO emission rates to the atmosphere were estimated to be maximally altered ±19% by the overlying canopy.

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Section: Discussionsupporting

confidence: 49%

Section: Discussioncontrasting

confidence: 37%

Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest: implications for tropospheric chemistry

et al. 2001

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“…This more comprehensive view intensified the impression that the NO 2 uptake rate of plants can be roughly estimated just by knowing the stomatal conductance. Rondón and Granat (1994) also conclude that the relationship between NO 2 needle conductance and stomatal conductance was close to 1 : 1.…”

Section: Deposition Velocities Of Nomentioning

confidence: 96%

“…The bi-variate regression is preferred to any standard forms of linear regression analysis, since (a) both concentrations, m a,NO 2 and m s,NO 2 , are measured with identical analyzers, (b) corresponding standard errors are of the same order of magnitude, and (c) errors are usually large (for m s,NO 2 and m a,NO 2 , as well as for F ex,NO 2 ) due to the fact that NO analyzers have in most cases measured at the lower end of their capabilities. In most of the previous studies simple linear regressions between exchange flux density F ex,i and the trace gas concentration at the outlet of the sample chamber m s,i were applied (Rondón et al, 1993;Rondón and Granat, 1994;Thoene et al, 1996;Sparks et al, 2001;Hereid and Monson, 2001), only Geßler et al (2000Geßler et al ( , 2002 applied a bi-variate algorithm.…”

Section: Compensation Point Concentrations Of Nomentioning

confidence: 99%

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Field investigations of nitrogen dioxide (NO<sub>2</sub>) exchange between plants and the atmosphere

2013

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Abstract. The nitrogen dioxide (NO 2 ) exchange between the atmosphere and needles of Picea abies L. (Norway Spruce) was studied under uncontrolled field conditions using a dynamic chamber system. This system allows measurements of the flux density of the reactive NO-NO 2 -O 3 triad and additionally of the non-reactive trace gases CO 2 and H 2 O. For the NO 2 detection a highly NO 2 specific blue light converter was used, which was coupled to chemiluminescence detection of the photolysis product NO. This NO 2 converter excludes known interferences with other nitrogen compounds, which occur by using more unspecific NO 2 converters. Photo-chemical reactions of NO, NO 2 , and O 3 inside the dynamic chamber were considered for the determination of NO 2 flux densities, NO 2 deposition velocities, as well as NO 2 compensation point concentrations. The calculations are based on a bi-variate weighted linear regression analysis (y-and x-errors considered). The NO 2 deposition velocities for spruce, based on projected needle area, ranged between 0.07 and 0.42 mm s −1 . The calculated NO 2 compensation point concentrations ranged from 2.4 ± 9.63 to 29.0 ± 16.30 nmol m −3 (0.05-0.65 ppb) but the compensation point concentrations were all not significant in terms of compensation point concentration is unequal to zero. These data challenge the existence of a NO 2 compensation point concentration for spruce. Our study resulted in lower values of NO 2 gas exchange flux densities, NO 2 deposition velocities and NO 2 compensation point concentrations in comparison to most previous studies. It is essential to use a more specific NO 2 analyzer than used in previous studies and to consider photo-chemical reactions between NO, NO 2 , and O 3 inside the chamber.

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Atmosphere — Surface Exchange of Nitrogen Oxides and Ozone

Fowler¹,

Meixner

Duyzer³

et al. 1997

Biosphere-Atmosphere Exchange of Pollutants and Trace Substances

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Studies on the dry deposition of NO<sub>2</sub> to coniferous species at low NO<sub>2</sub> concentrations

Cited by 32 publications

References 7 publications

Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest: implications for tropospheric chemistry

Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest: implications for tropospheric chemistry

Field investigations of nitrogen dioxide (NO<sub>2</sub>) exchange between plants and the atmosphere

Atmosphere — Surface Exchange of Nitrogen Oxides and Ozone

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Studies on the dry deposition of NO<sub>2</sub> to coniferous species at low NO<sub>2</sub> concentrations

Cited by 32 publications

References 7 publications

Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest: implications for tropospheric chemistry

Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest: implications for tropospheric chemistry

Field investigations of nitrogen dioxide (NO&lt;sub&gt;2&lt;/sub&gt;) exchange between plants and the atmosphere

Atmosphere — Surface Exchange of Nitrogen Oxides and Ozone

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Product

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Field investigations of nitrogen dioxide (NO<sub>2</sub>) exchange between plants and the atmosphere