An analysis of the age-related decline in aboveground net primary production: Potential causes and stand-to global scale implications
- Stith T. Gower
- Ross McMurtrie
Application to GCTE
The Global Change and Terrestrial Ecosystems (GCTE) Core Research Project of IGBP maintains a portfolio of core research which is considered fundamental to current international research on global change impacts on terrestrial ecosystems. Each core research contribution is associated with one of GCTE's Core Research Projects. The DeCAF project has applied for recognition as GCTE core research within a Core Research Project entitled "Decline of Forest Productivity during Stand Development" under GCTE Activity 3.5 ("Effects of Global Change on Managed Forests").
* Information on Core Research Project 1 (corproj1.doc)
* DeCAF's application for registration as a GCTE core research contribution. (coreres1.doc)
|Center Associate||5th December 1997—2nd June 1998||Participant List|
|Working Group||7th—9th December 1997||Participant List|
|Working Group||19th—22nd April 1998||Participant List|
|Working Group||24th—27th January 1999||Participant List|
We propose to synthesize NPP data for forest age-sequence studies and use three ecosystem process-based models to determine the mechanisms(s) responsible for the age-related NPP decline for natural and plantation forests in contrasting climates. We will emphasize inter-ecosystem comparisons for a broad-range of forest biomes (tropical broad-leaved evergreen, sub-tropical broad-leaved evergreen, warm temperate needle-leaved evergreen, cold-temperate needle-leaved evergreen, broad-leaved evergreen, and broad-leaved deciduous and boreal needle-leaved evergreen forests) to examine the relative importance of three hypothesized mechanisms (an altered balance between photosynthetic and respiring tissue, decreasing soil nutrient availability, and increasing stomatal limitation leading to reduced photosynthetic rates) responsible for NPP decline in aging forests. A second objective is to develop physiology-based algorithms that simulate the mechanisms responsible for age-related NPP decline; these algorithms will be incorporated into ecosystem model (i.e. it simulates carbon, water and energy fluxes) to examine stand-age related effects on carbon dioxide and water vapor exchange between forest biomes and the atmosphere and potential feedbacks.
|Type||Product of NCEAS Research|
|Data Set||Gower, Stith T.; McMurtrie, Ross. 1999. Decline in Carbon assimilation of forests data set.|