Concurrent anthropogenic stressors affect plant-soil systems with different plant diversity levels

Area of Science:

• * Ecology
• * Environmental Science
• * Soil Science

Background:

• * Ecosystem functioning is critically dependent on plant diversity.
• * Anthropogenic pressures threaten ecosystems, but their combined effects and the role of plant diversity remain understudied.
• * Understanding plant-soil system responses to multiple stressors is crucial for global change research.

Purpose of the Study:

• * To investigate the impact of increasing anthropogenic stressors on plant-soil systems with varying plant diversity.
• * To determine the role of plant diversity in mediating ecosystem responses to multiple co-occurring stressors.
• * To assess how plant diversity effects change under a gradient of anthropogenic pressures.

Main Methods:

• * Experimental manipulation of plant diversity (3 vs. 9 species) in plant-soil systems.
• * Application of an increasing number of anthropogenic stressors (0, 1, 2, 5, and 8).
• * Monitoring of soil properties, soil functions, and plant functional group evenness.

Main Results:

• * Soil properties and functions were primarily driven by the number of stressors, regardless of plant diversity.
• * Plant functional group evenness decreased consistently with an increasing number of stressors.
• * Higher plant diversity led to more complex interactions among stressors, but the overall effect of increasing stressors diminished plant diversity's influence.

Conclusions:

• * The number of anthropogenic stressors significantly impacts soil properties and functions, often overriding plant diversity effects.
• * Management strategies for plant-soil ecosystems should focus on reducing the cumulative number of coacting stressors.
• * This research underscores the importance of considering plant-soil interactions within the context of multifactorial global change.