REGROW: A Computer Model Simulating the Early Successional Process of a Disturbed Northern Hardwood Ecosystem

1993 ◽  
Vol 30 (4) ◽  
pp. 676 ◽  
Author(s):  
Pu Mou ◽  
Timothy J. Fahey
Keyword(s):  
Computer Model ◽  
Northern Hardwood ◽  
Successional Process ◽  
Northern Hardwood Ecosystem

The Northern Hardwood Ecosystem at Hubbard Brook in Relation to Other Forested Ecosystems in the World

1977 ◽  
pp. 103-112
Author(s):  
Gene E. Likens ◽  
F. Herbert Bormann ◽  
Robert S. Pierce ◽  
John S. Eaton ◽  
Noye M. Johnson
Keyword(s):  
Hubbard Brook ◽  
Northern Hardwood ◽  
The World ◽  
Forested Ecosystems ◽  
Northern Hardwood Ecosystem

Regional variability in nitrogen mineralization, nitrification, and overstory biomass in northern Lower Michigan

1989 ◽  
Vol 19 (12) ◽  
pp. 1521-1526 ◽  
Author(s):  
Donald R. Zak ◽  
George E. Host ◽  
Kurt S. Pregitzer
Keyword(s):  
N Mineralization ◽  
Hardwood Forests ◽  
Net N Mineralization ◽  
Northern Hardwood Forests ◽  
Northern Hardwood ◽  
Net Nitrification ◽  
Biomass Increment ◽  
Annual Biomass ◽  
Oak Ecosystem ◽  
Northern Hardwood Ecosystem

Potential net nitrogen (N) mineralization, potential net nitrification, and overstory (boles and branches) biomass were measured in nine forest ecosystems commonly found within the well-drained uplands of northern Lower Michigan. The ecosystem types ranged from oak-dominated forests on coarse-textured outwash sands to mesic northern hardwood forests on sandy glacial till. Overstory biomass was calculated using species-specific allometric equations developed for Lake States hardwood species. Potential net N mineralization and potential net nitrification were measured by a 30-day aerobic laboratory soil incubation. Analyses of (co)variance were used to determine differences in potential N mineralization, net nitrification, overstory biomass, and biomass increment among the nine ecosystem types. Linear and nonlinear regression analyses were used to predict overstory biomass and biomass increment using potential net N mineralization as the independent variable. Overstory biomass ranged from 92 t•ha−1 in a xeric oak ecosystem to 243 t•ha−1 in a northern hardwood ecosystem; annual biomass production ranged from 1.3 to 3.5 t•ha−1 year−1, respectively. Potential net N mineralization was lowest in the xeric oak ecosystem (52.0 μg N•g−1) and greatest in the mesic northern hardwood ecosystem (127.8 μg N•g−1). Potential net nitrification was 45.5 μg NO3−-N•g−1 in the northern hardwood ecosystem; 10 to 230 times greater than in other ecosystems. A saturating exponential model (y = a(1–e−kx) + c) produced the smallest residual mean squares in predicting overstory biomass (R2 = 0.822) and annual biomass increment (R2 = 0.847) from potential net N mineralization. Maximum overstory biomass and biomass increment predicted from this equation were 247 t•ha−1 and 3.7 t•ha−1, respectively. In addition, laboratory net N mineralization potentials were highly correlated with annual rates of N mineralization determined by insitu incubation (r2 = 0.849). Overstory biomass and woody biomass increment were poorly correlated with potential net nitrification. The exponential function used to predict biomass increment from N mineralization suggests that the productivity of some northern hardwood forests in northern Lower Michigan is not limited by N availability.

scholarly journals Anthropogenic N deposition and the fate of 15NO3- in a northern hardwood ecosystem

2004 ◽  
Vol 69 (2) ◽  
pp. 143-157 ◽  
Author(s):  
Donald R. Zak ◽  
Kurt S. Pregitzer ◽  
William E. Holmes ◽  
Andrew J. Burton ◽  
Gregory P. Zogg
Keyword(s):  
N Deposition ◽  
Northern Hardwood ◽  
Northern Hardwood Ecosystem

scholarly journals Simulated N deposition negatively impacts sugar maple regeneration in a northern hardwood ecosystem

2011 ◽  
Vol 49 (1) ◽  
pp. 155-163 ◽  
Author(s):  
Sierra L. Patterson ◽  
Donald R. Zak ◽  
Andrew J. Burton ◽  
Alan F. Talhelm ◽  
Kurt S. Pregitzer
Keyword(s):  
Sugar Maple ◽  
N Deposition ◽  
Northern Hardwood ◽  
Northern Hardwood Ecosystem
Sign in / Sign up

Export Citation Format

Share Document