Spatial and temporal controls on nitrogen availability in polygonal tundra landscapes

September 12th, 2018
The Science: 

Quantify nitrogen availability across polygonal tundra and assess how biogeochemical cycling of nitrogen can be scaled for purposes of regional modeling

The Impact: 

Spatial variation in nitrate and ammonium concentrations were determined using a network of ion exchange resins. Soil moisture and temperature were major determinants of nitrogen availability. Nitrogen availability, and nitrate and ammonium concentrations, covaried with landscape position.


Several scaling strategies based on geomorphology were evaluated for complex polygonal landscapes.

Productivity of vegetation is linked to spatial position across the tundra landscape.


Richard Norby, Oak Ridge National Laboratory