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.

Summary: 

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

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

Contacts: 

Richard Norby

Nordbyrj@ornl.gov, Oak Ridge National Laboratory