Occurrence of Arbuscular Mycorrhizal Herbs Decreases Selectively in Communities Dominated by Invasive Tree Acer negundo.

We tested whether one of the consequences predicted for alien plant invasion by the mutualism disruption hypothesis was true in the case of the ash-leaved maple Acer negundo L. The study aimed to determine whether the occurrences of mycorrhizal and nonmycorrhizal herbs varied similarly or differently in communities with varying degrees of A. negundo dominance.

Plants of Different Monocot Families Differ in Nitrogen and Phosphorus Contents in Leaves.

The folia content of nitrogen (N) and phosphorus (P) were studied in five monocot families: Amaryllidaceae, Cyperaceae, Iridaceae, Orchidacea, and Poaceae. The species of different monocot families were found to have different amount of N and P and their ratio in the leaves. The lowest N content was in Iridaceae and the highest was in Amaryllidaceae.

Root structure syndromes of four families of monocots in the Middle Urals.

The present article tests the following general assumption: plant taxa with different specializations towards mycorrhizal interactions should have different root syndromes. Roots of 61 species common in boreal zone were studied: 16 species of Poaceae, 24 species of Cyperaceae, 14 species of Orchidaceae, and 7 species of Iridaceae. Using a fixed material of 5 individuals of each species, the following was determined: number of orders of branching roots; transverse dimensions of root, stele and cortex; number of primary xylem vessels and exodermis layers; length of root hairs; abundance of mycorrhiza.

High canopy cover of invasive Acer negundo L. affects ground vegetation taxonomic richness.

We assessed the link between canopy cover degree and ground vegetation taxonomic richness under alien ash-leaved maple (Acer negundo) and other (native or alien) tree species. We investigated urban and suburban forests in the large city of Yekaterinburg, Russia. Forests were evaluated on two spatial scales.

The Natural Abundance of Heavy Nitrogen Isotope (15N) in Plants Increases near a Large Copper Smelter.

The ratio of stable isotopes of nitrogen (N and N) has been assessed in leaves of the forest plants from different functional groups (with ectomycorrhiza, ericoid, and arbuscular mycorrhiza; in a nitrogen-fixing symbiosis) under the conditions of strong transformation of ecosystems by the Karabashsky Copper-Smelting Plant effluents in the Southern Urals. The abundance of N in the plants generally increases in polluted habitats. The abundance of the heavy isotope N increases significantly with pollution in ericaceous dwarf shrubs (by 3.

Rapid use of resources as a basis of the Heracleum sosnowskyi invasive syndrome.

The functional properties of the invasive Heracleum sosnowskyi were compared with those of the native Heracleum sibiricum. The leaf and root traits, as well as those of a whole plant and of the mycorrhiza formation, were studied. H.