Carbon Sequestration of ShortRotation Hybrid Poplar Plantations Compared with Agricultural Crops and

1
Carbon Sequestration of Short-Rotation Hybrid
Poplar Plantations Compared with Agricultural
Crops and Farm Woodlots

• by
• J.G. Isebrands
• USDA-Forest Service, Rhinelander, WI
• Mark D. Coleman
• USDA-Forest Service, New Ellenton, SC

2
Objective

• Compare soil carbon content of short rotation
  hybrid poplar(SRHP) stands with adjacent
  agricultural crops and farm woodlots in the North
  Central Region.

3
27 Locations

• 17 Minnesota
• 7 Wisconsin
• 2 Iowa
• 1 North Dakota

4
Variables

• Location
• Cover Type SRHP, Ag, Forest
• Topography Riparian, Upland
• Crop Trees, Hay, Other Crops
• Age SRHP2-15 yr
• Position
• Depth
• Bulk Density
• Soil Organic Carbon ()

5
Sampling Design

1 m
1 m
1 m
3 Positions/ Site
3 Depths/ Positions
0-8 cm
8-32 cm
32-128 cm
6
Depth of Soil Important

Upper Layer SOC ()-Forest gtSRHP and AG Bulk
Density- SRHP and AG gt Forest SOC (Vol.)- NS
Middle Layer SOC ()-SRHP and AG gt Forest Bulk
Density- SRHP and AG gt Forest SOC (Vol.)- SRHP
and Ag gt Forest
Lower Layer Low SOC () Lower Bulk Density for
Forest Similar SOC (Vol.)
7
SOC Conclusions

• Locations Different
• Crops Different
• Topography Important
• Soil Heterogeneous

8
Future Studies

• More Sites Needed
• More Riparian Sites
• Switchgrass Comparison
• Sampling Methods