Biochar-macrofauna interplay: Searching for new bioindicators

Area of Science:

• Agricultural Science
• Soil Science
• Ecology

Background:

• Biochar application in soils is a climate change mitigation strategy that enhances crop productivity through various mechanisms.
• Soil property alterations from biochar impact soil biota, influencing biochar aging.
• Limited research exists on biochar's effects on soil meso- and macrofauna, particularly in the crucial topsoil layer (0-30 cm).

Purpose of the Study:

• To investigate the interactions between biochar soil amendments and aboveground soil macro-meso fauna in a field crop setting.
• To assess the short-term ecological effects of different biochar types on soil fauna communities.

Main Methods:

• A randomized-block experiment was conducted on a processing tomato crop in Northern Italy.
• Three distinct biochar types were applied.
• Soil parameters and fauna abundances were periodically monitored throughout the crop growing cycle (Summer 2013).

Main Results:

• Biochar application had a minor overall impact on soil fauna compared to agricultural management practices.
• No significant short-term ecological interferences were observed from biochar amendments.
• Ant populations (Formicidae) showed variations in abundance and distribution linked to soil temperature, pH, and humidity.

Conclusions:

• Biochar amendments appear to be ecologically safe in the short term regarding soil fauna.
• Ants can serve as a valuable indicator group for studying biochar-soil biota interactions due to their sensitivity to altered soil conditions.
• Further research can explore long-term effects and specific mechanisms driving faunal responses to biochar.