Grassland Management Affects Plant Leaf Nutrients Under Ambient and Future Climate

Area of Science:

• Ecology
• Plant Science
• Environmental Science

Background:

• Central European grasslands are influenced by climate change and agricultural management.
• Understanding the interaction between these drivers on plant nutrients is crucial for ecosystem health.
• Species-rich, non-fertilized grasslands are sensitive indicators of environmental change.

Purpose of the Study:

• To investigate the interactive effects of climate change and grassland management on plant and soil nutrient concentrations.
• To determine how different management types (mowing vs. grazing) affect nutrient dynamics under altered climate conditions.
• To assess nutrient variations across plant functional groups (grasses, legumes, forbs).

Main Methods:

• Field experiment in Central Germany simulating future climate (higher temperature, altered precipitation).
• Comparison of two management types: two-time mowing (meadow) and three-time sheep grazing (pasture).
• Analysis of plant leaf and soil nutrient concentrations (N, P, K, Ca, Mg, S) and ratios during peak growth.

Main Results:

• Plant functional groups showed distinct nutrient profiles, except for sulfur.
• Future climate treatment led to lower leaf nitrogen:phosphorus (N:P) ratios.
• Pasture management resulted in higher leaf and soil potassium (K) and lower leaf calcium (Ca) compared to meadows.
• Grasses had higher leaf N, legumes higher leaf S and lower N:P ratios, and forbs lower leaf S in pastures versus meadows.

Conclusions:

• Grassland management (mowing vs. grazing) significantly modifies plant and soil nutrient concentrations, even at low intensity.
• Observed effects of management were more pronounced than the impacts of the moderate climate change treatment.
• Future research should focus on the long-term consequences of management-driven nutrient shifts in grassland ecosystems.