Morphology of root systems and mycorrhiza formation in fir and spruce seedlings under the influence of emissions from a coopper-smelting plant

Veselkin, D.V.

Lesovedenie 4: 52-60

2006


ISSN/ISBN: 0024-1148
Accession: 012328105

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Abstract
The morphology of root systems and formation of mycorhiza in fir (Abies sibirica Ledeb.) and spruce (Picea obovata Ledeb.) seedlings were studied in conditions of technogenic heavy metal (Cd, Cu, Zn, and Pb) and SO2 pollution of southern taiga natural ecosystems (the Middle Urals). In the polluted environment, the development of the main root in seedlings was oppressed, but the growth of lateral conductiong roots was activated. At the same time, the absolute (the number of plant structures) and relative (the number of structures per 100 mm of conducting roots) number of absorbing organs (roots, mycorrhizas, and mycorrhiza tips) increased. The reasons for the branching of underground organs (roots and mycorrhiza) were related to both direct technogenic effects (elevated toxicity of soils)and indirect (changes in the phytocenotic regime of forest communities) ones.