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Content archived on 2024-06-10

Quantification of the chronic phytoxicity of no2 and nh3 to forest ecosystems

Objective



There is NH3- and N02-dependent nitrogen deposition on forest canopies. Generated ions (NH4+, N02-, N03-) dissolve in the canopy throughfall and can be taken up from the soil by trees and competitive organisms. Partially they also leak into the subsoil water. Gaseous N02 and NH3 diffuse into needles via open stomata. In trees, airborne reduced or oxidized nitrogen is incorporated into organic compounds. Resultant nitrogen compounds may stimulate tree growth. Alternatively, they may accumulate. Nitrogen fluxes can be accompanied by mineral cation fluxes. Cations balance the charge of N03- or organic nitrogen-containing anions (e.g. proteins). There is also NH4+ - cation exchange at root surfaces and in the soil matrix. Field measurement of cation flux changes and integration of obtained parameters into an available canopy growth model is expected to quantify nitrogen-caused canopy thinning or cation deficiency, and the separate derivation of N02-tolerance limits for different forest ecosystems.

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Coordinator

Aristotle University of Thessaloniki
EU contribution
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Address
Analytical Chemistry Lab
54006 Thessaloniki
Greece

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