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- W2134375180 abstract "Trace gas exchange of NO 2 and O 3 at the soil surface of the primary rain forest in Reserva Biológica Jarú (Rondônia, Brazil) was investigated by chamber and gradient methods. The ground resistance to NO 2 and O 3 deposition to soil was quantified for dry and wet surface conditions using dynamic chambers and was found to be fairly constant at 340 ± 110 and 190 ± 70 s m −1 , respectively. For clear‐sky conditions, the thermal stratification of the air in the first meter from the forest floor was stable during daytime and unstable during nighttime. The aerodynamic resistance to NO 2 and O 3 deposition to the ground in the first meter above the forest floor was determined by measurements of 220 Rn and CO 2 concentration gradients and CO 2 surface fluxes. The aerodynamic resistance of the 1‐m layer above the ground was 1700 s m −1 during daytime and 600 s m −1 during nighttime. The deposition flux of O 3 and NO 2 was quantified for clear‐sky conditions from the measured concentrations and the quantified resistances. For both trace gases, deposition to the soil was generally observed. The O 3 deposition flux to the soil was only significantly different from zero during daytime. The maximum of −1.2 nmol m −2 s −1 was observed at about 1800 and the mean daytime flux was −0.5 nmol m −2 s −1 . The mean NO 2 deposition flux during daytime was −1.6 ng N m −2 s −1 and during nighttime −2.2 ng N m −2 s −1 . The NO x budget at the soil surface yielded net emission day and night. The NO 2 deposition flux was 74% of the soil NO emission flux during nighttime and 34% during daytime. The plant uptake of NO 2 and O 3 by the leaves of Laetia corymbulosa and Pouteria glomerata , two typical plant species for the Amazon rain forest, was investigated in a greenhouse in Oldenburg (Germany) using branch cuvettes. The uptake of O 3 was found to be completely under stomatal control. The uptake of NO 2 was also controlled by the stomatal resistance but an additional mesophyll resistance of the same order of magnitude as the stomatal resistance was necessary to explain the observed uptake rate." @default.
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- W2134375180 date "2002-09-04" @default.
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- W2134375180 title "Exchange fluxes of NO<sub>2</sub>and O<sub>3</sub>at soil and leaf surfaces in an Amazonian rain forest" @default.
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- W2134375180 doi "https://doi.org/10.1029/2001jd000654" @default.
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