From Points to Landscapes: Measuring and Scaling Up Methane Emissions From Mound-Building Termites

Area of Science:

• Environmental Science
• Ecology
• Biogeochemistry

Background:

• Termites are a significant, yet poorly quantified, source of global methane (CH4) emissions.
• The "scaling paradox" describes how CH4 emission drivers change across different spatial scales (species, mounds, landscapes).

Purpose of the Study:

• To address the "scaling paradox" of termite methane emissions.
• To investigate CH4 emission heterogeneity within Macrotermes mounds and surrounding soils.
• To propose methods for accurately mapping and modeling termite CH4 dynamics.

Main Methods:

• Analysis of field data from large Macrotermes mounds in South Africa.
• Examination of spatial heterogeneity within termite mounds.
• Assessment of subterranean foraging network impacts on soil methane cycling.

Main Results:

• Macrotermes mounds exhibit complex internal spatial CH4 emission heterogeneity.
• Termite foraging networks can transform methane-absorbing soils into methane sources.
• CH4 emission drivers vary significantly across different spatial scales.

Conclusions:

• Resolving the termite CH4 "scaling paradox" requires accounting for spatial variation.
• Integrating traditional emission factors with multi-scale technologies is crucial.
• Accurate mapping and modeling of termite CH4 dynamics are essential for global budgets.