Sensitivity Assessment of Lawn Grasses to Salt Pollution of Moscow Soil-Like Grounds by Laboratory Phytotesting
摘要
Significant lawn coverage degradation in cities occurs due to the application of sodium chloride de-icing reagents. Despite the in-depth study of soil salinity that has taken place, research measuring the effect of sodium chloride on lawn grasses on soil-like grounds is insufficient. This study assessed the phytotoxicity of the most common grasses that form Moscow lawns—red fescue (Festuca rubra L.), bentgrass (Agrostis stolonifera L.), perennial ryegrass (Lollium perenne L.), as well as white clover (Trifolium repens L.) by laboratory phytotesting. The plants were exposed for 7 days on soil-like grounds with the addition of sodium chloride at concentrations of 0.1, 0.5, and 1.5 wt %. The observed parameters were “seedling root length,” “seedling stem length,” and “seed germination.” The studied crops were not characterized by the same sensitivity to salt contamination of soils, and the study showed the importance of simultaneous analysis of all plant growth parameters to make a reasonable decision on the choice of optimal crops for city landscaping. The greatest differences between plants were revealed in the parameter “root length” at high concentrations of de-icing reagent (1.5 wt %) and in the parameter “seed germination” over the entire range of salt pollution. As an algorithm for selecting optimal plants for salt-contaminated soils, it is proposed that the first step is to analyze the results of phytotoxicity determined by germination and selection of plants with minimal inhibition of this parameter. The next is to select those among them that simultaneously showed the least phytotoxicity in terms of root length and stem length. Based on the study’s results, we can recommend bentgrass as a universal salt-tolerant crop, as well as ryegrass at a sodium chloride concentration of 0.1 and 0.5%.