Climatic Legacies Drive Spatial Aggregation of Plants in Drylands

Area of Science:

• Ecology
• Paleoclimatology
• Dryland Ecosystems

Background:

• Dryland vegetation typically forms spatial patches separated by bare soil.
• Research has primarily focused on current climate and herbivory's impact on these patterns.
• Past climate conditions (climate legacies) may also influence present-day vegetation patterns.

Purpose of the Study:

• To investigate the effects of past and current climates on plant spatial patterns in drylands.
• To compare the magnitude of past versus current climate influences on vegetation cover and aggregation.
• To explore potential mechanisms, such as soil properties, linking climate legacies to vegetation patterns.

Main Methods:

• Integrated datasets on plant spatial patterns with paleoclimate data (mid-Holocene, last glacial maximum).
• Analyzed the influence of past and current climate variables on vegetation cover and spatial aggregation.
• Examined relationships between climate legacies, soil multifunctionality, and soil sand content.

Main Results:

• Past climates exert influences on vegetation cover comparable to current climates.
• Climate legacies have a stronger effect on the spatial aggregation of dryland vegetation than current climates.
• Long-lasting effects of past climates on soil properties (multifunctionality, sand content) may mediate vegetation pattern legacies.

Conclusions:

• Climate legacies play a crucial role in shaping current dryland vegetation patterns, particularly spatial aggregation.
• Understanding these legacies is essential for accurately assessing dryland functioning and resilience.
• This research highlights the importance of considering long-term climate dynamics and their effects on soil when studying ecosystems.