A review on invasive false indigo bush (Amorpha fruticosa L.): Nuisance plant with multiple benefits.

Increased mobility of people around the globe has facilitated transferring species to new environments, where some have found suitable conditions and even become invasive. False indigo-bush (Amorpha fruticosa L.) is a plant native to North America but has intentionally or unintentionally spread over the Northern Hemisphere, where it often becomes invasive. The plant is especially easily dispersed within the watersheds of large rivers, where seasonal flooding is regular. Seeds and other propagules are buoyant, and when the water recedes, new plants emerge, forming dense thickets where only a few other species can co-exist. In order to sustain native biodiversity, spread control is needed. However, mechanical control and eradication measures currently in use are labor demanding and costly, while application of herbicides is limited. On the other hand, the plant possesses a number of beneficial properties, such as phytochemical applications (medical and insecticidal effects), biocoenotic uses (honey plant, ornamental features), and ecosystem services (soil stabilization, provision of food for animals, and fiber and biomass for industry, e.g., nanocellulose). For the reasons above mentioned, the plant is considered quite controversial, and the paper discusses both aspects: potential detrimental effects when introduced to new habitats and its beneficial uses for human society. In addition, the paper presents alternative measures of spreading control (e.g., grazing) and argues that exploiting it for beneficial purposes might help spread control, thus covering the expenses of controlling its distribution.

Potential of urban trees for mitigating heavy metal pollution in the city of Novi Sad, Serbia.

The current study analyzed heavy metal (HM) concentrations in the urban soil and tree leaves in the city of Novi Sad, Serbia, with the aim to identify specific tree species with good HM bioaccumulative abilities that can mitigate HM pollution in urban areas. Zinc (Zn), copper (Cu) and lead (Pb) were selected for the analysis of tree leaves and soil at 16 locations close to urban roads, main boulevards and high-traffic streets. Leaf material of four most common tree species: Platanus × acerifolia (Aiton) Willd., Celtis occidentalis L., Tilia argentea L. and Quercus robur L. and soil samples were analyzed with the aim to identify the potential hotspots and sources of pollution. Analysis of variance (ANOVA) and t test was applied to the available data sets to find differences between the HM concentrations in the analyzed trees and soil samples. Geographic information system (GIS) mapping was used for visualization of the concentration distributions and illustration of the HM contaminated hotspots. Bioconcentration factors (BCF) were calculated and they showed that the plants of the species Celtis occidentalis L. have the ability to retain Cu, the species Quercus robur L. retains mostly Zn, Tilia argentea L. accumulates Pb, while Platanus x acerifolia (Aiton) Willd. retains the smallest amount of the tested HMs.