Vegetation composition shifts, and in particular, shrub expansion across the Arctic tundra
are some of the most important and widely observed responses of high-latitude ecosystems …

Research on the degree to which carbon (C) availability limits growth in trees, as well as
recent trends in climate change and concurrent increases in drought-related tree mortality …

Forests are chiefly responsible for the terrestrial carbon sink that greatly reduces the buildup
of CO 2 concentrations in the atmosphere and alleviates climate change. Current predictions …

Terrestrial net primary production (NPP) is sensitive to a number of controls, including
aspects of climate, topography, soils, plant and microbial characteristics, disturbance, and …

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 …

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 …

Each tree ring contains an image of the time when the ring formed, projected onto the ring's
size, structure, and composition. Tree rings thus are natural archives of past environments …

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 …

Temperate and boreal forest ecosystems contain a large part of the carbon stored on land, in
the form of both biomass and soil organic matter. Increasing atmospheric [CO2], increasing …

We proposed the hydraulic limitation hypothesis (HLH) as a mechanism to explain universal
patterns in tree height, and tree and stand biomass growth: height growth slows down as …