Applying plant disturbance indicators to reveal the hemeroby of soil macrofauna species

Abstract

Hemeroby is an integrated indicator for measuring human impacts on environmental systems. Hemeroby has a complex nature and a variety of mechanisms to affect ecosystems. Hemeroby is often used to assess disturbances in different vegetation types but this concept has seldom been evaluated for animals. The role of the hemeroby gradient in structuring the soil macrofauna community was investigated. The experimental polygon was located in Botanical Garden of the Oles Honchar Dnipro National University (Dnipro City, Ukraine). There were 20 sites within the polygon. On each of them at 105 points samples of soil macrofauna were taken, soil penetration resistance, electrical conductivity of soil, depth of litter, height of grasses were measured. Within each site, a description of the vegetation cover was made. Based on the description of the vegetation, an indication of the level of ecosystem hemeroby within the polygons was conducted. In total, 48,457 invertebrate (Annelida, Arthropoda, and Mollusca) individuals of 6 classes, 13 orders, 50 families and 83 species or parataxonomic units were recorded. Phytoindication reveals that the level of hemeroby within the studied polygons varies from 34.9 to 67.2. The model V and VI from the HOFJO-list were the most optimal model of the species response to hemeroby gradient. The weighted average factor value was used to assess the optimal factor level for the species in a symmetrical bell-shaped response model. The optimal factor level of the hemeroby for the soil macrofauna species ranges from 34.9 to 66.0. Species also differ in degree of specialization to the factor of hemeroby. There was a regular change in the soil macrofauna community size and diversity in the hemeroby gradient. The limiting influence of anthropogenic transformation of the environment on the abundance of soil macrofauna community is clearly marked at the level of hemeroby above average. Species diversity of the community is greatest at moderate hemeroby level. Both relatively little transformed habitats and strongly transformed ones are characterized by lower species richness of the soil macrofauna community. The Shannon index shows a clear upward trend with increasing hemeroby. The Pielou index indicates that the main reason for this trend is an increase in community evenness with increasing hemeroby. The intermediate disturbance hypothesis was fully supported with respect to species richness. For the number of species, there is indeed a certain level of heterogeneity at which the number of species is highest. For another aspect of diversity, evenness, this pattern is not true. The evenness increases with increasing habitat disturbance. This result is due to a decrease in the abundance of dominant species.

Active garden therapy for the elderly and people with disabilities

“…All the necessary research has been performed to develop a project to create a location for active garden therapy. Inventory of existing plantations was carried out in accordance with the Instruction on inventory of green plantations in settlements of Ukraine [17][18][19]. Recommendations for the establishment of therapeutic gardens in Singapore were chosen as the basis for the future project [20].…”

Temporal Dynamics of the Terrestrial Invertebrate Community Under Conditions of Land Reclamation

“…Але в реальності характер відгуку видів на вплив екологічних факторів надзвичайно різноманітний, тому метод середнього зваженого або регресійний підхід дають адекватні оцінки оптимуму тільки для обмеженої кількості випадків (Pakhomov et al, 2019). Серед моделей з HOFJO-переліку концепція єдиного оптимуму представлена тільки моделями IV та V (Yorkina et al, 2020). Для інших моделей оцінка оптимуму може бути зроблена тільки умовно здебільшого на основі припущень зручності.…”

Effect of recreation on the spatial variation of soil physical properties

“…Organic horizons are generally less susceptible to erosion than mineral soil, but if organic matter is crushed by trampling, it can also be eroded, exposing the mineral soil beneath it [21][22][23]. When trampling compacts the mineral soil, which does not have the physical elasticity of organic matter, the particles are pressed tightly together, dramatically reducing the number of pores between the particles [24][25][26].…”

“…The soil penetration resistance along with other morphological and physical properties is used to diagnose urban soils [4,27] and is a reliable indicator of recreational load [4,25]. The soil compaction modifies the soil moisture regime and can inhibit root growth if certain boundary levels are exceeded, resulting in the plant not being able to obtain water or nutrients at depth [28,29].…”