Reproductive allocation in plants as affected by elevated carbon dioxide and other environmental changes: a synthesis...

Area of Science:

• Plant Ecology
• Global Change Biology
• Reproductive Biology

Background:

• Reproduction is a key factor in plant population dynamics.
• Elevated atmospheric carbon dioxide (CO2) enhances plant biomass but its effect on reproductive allocation (RA) is unclear.

Purpose of the Study:

• To investigate the overall effect of elevated CO2 on RA in herbaceous plants.
• To analyze how environmental factors like low nutrients, drought, and ozone interact with elevated CO2 to affect RA.

Main Methods:

• Meta-analysis
• Graphical vector analysis
• Examination of herbaceous plants under various environmental conditions.

Main Results:

• Elevated CO2 had a minor overall effect (-0.9%) on RA.
• RA responses to elevated CO2 varied by plant species, reproductive strategy, and functional group.
• Elevated CO2 decreased RA in wild iteroparous species (-8%) but increased it in crop iteroparous species (+14%).
• RA was unaffected by CO2 under no stress or low-nutrient conditions.
• Elevated CO2 and ozone decreased RA, while elevated CO2 ameliorated drought stress effects on RA.

Conclusions:

• Elevated CO2's impact on RA is species-specific and context-dependent.
• Differential effects of elevated CO2 on RA can alter plant community composition.
• Global environmental changes may significantly impact natural and agricultural ecosystems through altered plant reproduction.