Publisher Summary This chapter reviews the evidence for the pattern of growth decline with
age and discusses the evidence for the mechanisms that may be responsible. It begins with …

To grow, an organism must respire substrates to produce C-skeleton intermediates, usable
energy (ie ATP), and reducing power [ie NAD (P) H] to support biosynthesis and related …

This paper describes a stand growth model, based on physiological processes, which
incorporates a number of steps and procedures that have allowed considerable …

Michael G. Ryan and Barbara J. Yoder y do old trees stop grow-/ing in height? Trees seem
to have mechanisms that slow their growth as they age and prevent them from growing …

Here we present a new terrestrial biosphere model (the Integrated Biosphere Simulator‐
IBIS) which demonstrates how land surface biophysics, terrestrial carbon fluxes, and global …

A new model of global primary production (GLObal Production Efficiency Model, GLO-PEM),
based on the production efficiency concept, is decribed. GLO-PEM is the first attempt to …

Considerable progress has been made in our ability to model and measure annual gross
primary production (GPP) by terrestrial vegetation. But challenges remain in estimating …

While a new class of Dynamic Global Ecosystem Models (DGEMs) has emerged in the past
few years as an important tool for describing global biogeochemical cycles and atmosphere …

I t is well known to ecologists and forest managers that in mature forests aboveground
biomass production declines as trees age. Forest age-sequence studies reveal that …

The coupled carbon-climate models reported in the literature all demonstrate a positive
feedback between terrestrial carbon cycles and climate warming. A primary mechanism …