Reverse diversity-biomass patterns in grasslands are constrained by climates and stoichiometry along an elevational...

Area of Science:

• Ecology
• Environmental Science
• Plant Science

Background:

• Grassland ecosystem functions depend on plant diversity and biomass.
• Environmental changes significantly impact grassland diversity and biomass variability.
• Understanding these impacts and their drivers is crucial for grassland management.

Purpose of the Study:

• To investigate patterns of plant diversity and biomass along an elevational gradient in southwest China.
• To identify the key climatic, soil, and plant drivers influencing these patterns.
• To re-evaluate the relationship between diversity and biomass under environmental change.

Main Methods:

• Intensive fieldwork across a 1000 km transect.
• Data collection on plant diversity, biomass, climate, soil properties, and plant stoichiometric traits.
• Analysis of elevational patterns (50-4000 m) and driver influences.

Main Results:

• Grassland biomass significantly decreased with increasing elevation.
• Grassland diversity significantly increased with increasing elevation.
• A reverse pattern between biomass and diversity was observed, driven by climate (temperature, precipitation), leaf N:P ratio, and soil N content.

Conclusions:

• The study reveals a reverse diversity-biomass pattern in grasslands, contrary to previous findings.
• Climatic factors, soil properties, and plant stoichiometry are key drivers of this pattern.
• Findings offer new insights into grassland responses to environmental change and climate change predictions.