Abstract
Abstract Seasonal shifts in microbial diversity of the rhizosphere in constructed wetlands were investigated to test the influence of the developmental stages of Lythrum salicaria. A 240-day study of microbial rhizosphere communities was undertaken under different total organic carbon levels in the influent water, while the influences of plant growth on microbial diversity were monitored in planted and unplanted wetlands. The community-level physiological profile (CLPP) was assessed using substrate utilization patterns that were gathered using Biolog Eco Plates™. The microorganism community structure and diversity at different season under different influent conditions demonstrated that the developmental stages of plant and water quality determined their own functional rhizosphere communities. Marked seasonal shifts in three diversity indices and relative activity were observed in microbial communities in the unplanted wetlands. While in the planted wetlands, the CLPP at different developmental stages were significantly different between the young plant and maturing plant at low or high TOC level. This detailed study suggested that wetland plant determined specialized microbial communities that change in response to plant growth.
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