Related Experiment Videos
Aspect differences in above- and belowground carbon allocation: a Montana case-study.
1Arthur Temple College of Forestry, Stephen F. Austin State University, Nacogdoches, TX, 75962, USA. dcoble@sfasu.edu
Environmental Pollution (Barking, Essex : 1987)
|February 9, 2002
Summary
Aboveground net primary production (ANPP) and belowground gross primary production (BGPP) increased with leaf area index (LAI) and favored north-facing slopes. Differences in forest carbon allocation were due to both production and site factors.
Area of Science:
- Forest ecology
- Ecosystem productivity
- Carbon cycling
Background:
- Aboveground net primary production (ANPP) and belowground gross primary production (BGPP) are key ecosystem processes.
- Understanding factors influencing ANPP and BGPP is crucial for forest management and climate change research.
Purpose of the Study:
- To compare ANPP and BGPP in relation to leaf area index (LAI) and slope aspect.
- To investigate the relationship between ANPP and BGPP under varying forest conditions.
Main Methods:
- Field measurements of ANPP and BGPP in paired plots on north and south aspects.
- Comparison of forest stands with high and low overstory LAI.
- Analysis of carbon allocation patterns and soil CO2 flux.
Main Results:
- BGPP increased with ANPP, but not proportionally, with ranges of 1550–4400 kg C ha−1 year−1 for ANPP and 1360–3500 kg C ha−1 year−1 for BGPP.
- Both ANPP and BGPP were significantly higher on north aspects compared to south aspects for any given LAI.
- Litterfall constituted the largest portion of ANPP, followed by overstory biomass increases; soil CO2 flux was greater on north aspects.
Conclusions:
- Forest carbon allocation differences are not solely due to reallocation between root and aboveground production.
- Both carbon production and allocation patterns varied significantly among the studied sites.
- Aspect and LAI are critical factors influencing forest productivity and carbon dynamics.