Long-Term Effects of Soil Remediation with Willow Short Rotation Coppice on Biogeographic Pattern of Microbial...

Area of Science:

• Soil Science
• Microbiology
• Environmental Science

Background:

• Short rotation coppice (SRC) is utilized for bioenergy, land restoration, and pollution remediation.
• Long-term impacts of SRC on soil microbial communities remain under-characterized.

Purpose of the Study:

• To investigate the effects of SRC on soil microbial functional genes and biogeographic patterns.
• To compare soil microbial communities under SRC with willow trees versus permanent grassland.

Main Methods:

• GeoChip analysis was employed to assess microbial functional gene diversity and abundance.
• Measurements included microbial ATP, respiration, metal phytoavailability, and soil nutrient concentrations (TOC, NO3--N, P).

Main Results:

• SRC soil exhibited lower functional gene diversity but similar microbial ATP and respiration compared to grassland.
• SRC soil showed reduced microbial genes for metal/antibiotic resistance and stress proteins.
• Lower metal phytoavailability (As, Cd, Ni, Zn) and higher TOC, NO3--N, and P were observed in SRC soil.
• Higher microbial taxa-area relationship turnover rate was noted in SRC soil within 0.125 m².

Conclusions:

• SRC management acts as a phytotechnology, creating a more benign soil habitat for microorganisms.
• Long-term SRC practices lead to soil organic carbon and nutrient enrichment, ameliorating microbial conditions.