Crop rotational diversity can mitigate climate-induced grain yield losses

Area of Science:

• Agricultural Science
• Climate Change Adaptation
• Agronomy

Background:

• Climate change poses risks to global food security through increased extreme weather events.
• Crop yield losses are a major concern, necessitating adaptive strategies in agriculture.
• The role of crop rotational diversity (CRD) in climate change adaptation is not fully understood.

Purpose of the Study:

• To quantify the impact of climatic conditions on crop yields under varying levels of CRD.
• To determine the potential of CRD as a climate change adaptation strategy for small grains and maize.
• To identify optimal levels of CRD for maximizing yield benefits under different climatic scenarios.

Main Methods:

• Analysis of 32 long-term field experiments across Europe and North America (10-63 years).
• Quantification of yield responses of small grains and maize to climatic variations (temperature, precipitation, dry spells) under different CRDs.
• Statistical modeling to assess the relationship between CRD, functional richness, and crop yield.

Main Results:

• Species-diverse and functionally rich rotations significantly compensated for yield losses caused by anomalous warm, dry, or wet conditions.
• Even adding a single functional group or crop species to monocultures mitigated yield losses from significant climatic changes.
• Increased crop functional richness improved yields under high temperatures, independent of precipitation.
• Optimal yield benefits were observed with two to four crop species in rotation, with diminishing returns at higher diversity.

Conclusions:

• Diversifying crop rotations with functionally distinct species is a viable adaptation strategy for cropping systems facing global warming and altered precipitation patterns.
• Adjusting crop species diversity within rotations can maximize yield benefits under specific climatic conditions.
• CRD offers a promising approach to enhance agricultural resilience and mitigate climate change impacts on crop production.