Resistance and Resilience of Soil Nitrogen Cycling to Drought and Heat Stress in Rehabilitated Urban Soils

• DOI: 10.3389/fmicb.2021.727468
• Publication Date: 2021-12-22T06:02:05Z
• Authors: Mehdi Fikri; Catherine Joulian; Mikael Motelica-H...; Marie-Paule Norini; Jennifer Hellal
• Keywords: Cycling; Soil carbon; Nitrogen Cycle; Microcosm; Soil functions

In the context of climate change and biodiversity loss, rehabilitation degraded urban soils is a means limiting artificialization terrestrial ecosystems preventing further degradation soils. Ecological approaches are available to reinitiate soil functions enhance plant development. However, little known about long-term stability rehabilitated in terms when natural or anthropogenic perturbations occur. Based on soils, present study sought evaluate resistance resilience linked carbon cycling phosphate dynamics addition nitrogen related microbial communities after heat drought stress. A laboratory experiment was conducted microcosms under controlled temperature conditions, with four contrasted collected from brownfield; an initial, non-rehabilitated (IS), technosol high organic matter level (HO), two technosols less (LO1 LO2), together their respective controls (no stress). Changes potential denitrification (PDR), nitrification (PNR) rates, interactive relationships activities physicochemical properties were determined following combined (40°C) stress period 21 days. Measurements carried out immediately (resistance), then also 5, 30, 92 days rewetting at 60% water holding capacity (resilience). Microbial involved such as proved be low all except for IS; however, they resilient recovered rapidly rewetting. On other hand, gene abundances that measured relation processes showed denitrification, more than whereas same way. Results suggest that, unless contain amounts matter, imported can vulnerable environmental pressures already present. This should considered rehabilitating