Publications

The proliferation of digital cameras co-located with eddy covariance instrumentation provides new opportunities to better understand the relationship between canopy phenology and the seasonality of canopy photosynthesis. In this paper we analyze the abilities and limitations of canopy color metrics measured by digital repeat photography …

Disturbance-induced tree mortality is a key factor regulating the carbon balance of a forest, but tree mortality and its subsequent effects are poorly represented processes in terrestrial ecosystem models. It is thus unclear whether models can robustly simulate moderate (non-catastrophic) disturbances, which tend to increase biological …

Although it may be difficult for us to observe in our short lifetimes, the composition of trees in a forest can be a very variable thing. When a forest is clear-cut or thinned by fire, the first trees to rebound are often the fastest growing—those that can sprout quicker than their competitors. However, over time, these speedy …

Carbonyl sulfide (OCS), the most abundant sulfur gas in the
atmosphere, has a summer minimum associated with uptake by
vegetation and soils, closely correlated with CO 2 . We report the
first direct measurements to our knowledge of the ecosystem flux
of OCS throughout an annual cycle, at a mixed temperate forest.
The forest …

With an increasing fraction of the world’s forests being intensively managed for meeting humanity’s need for wood, fiber and ecosystem services, quantitative understanding of the functional changes in these ecosystems in comparison with natural forests is needed. In particular, the role of managed forests as long-term carbon …

Throughout the southern US, past forest management practices have replaced large areas of native
forests with loblolly pine plantations and have resulted in changes in forest response to extreme
weather conditions. However, uncertainty remains about the response of planted versus natural
species to drought across the geographical …

Global-scale studies indicate that semiarid regions strongly regulate the terrestrial carbon sink.
However, we lack understanding of how climatic shifts, such as decadal drought, impact carbon sequestration across the wide range of structural diversity in semiarid ecosystems. Therefore, we used eddy covariance measurements to quantify …

Peatlands are a type of wetland characterized by the accumulation of organic matter, called peat, and are important carbon reservoirs. In areas with poor drainage, human-induced forest fires and logging can produce flooded conditions and organic matter accumulation, which generates an ecosystem called anthropogenic peatland. Productive …