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There is general agreement that terrestrial systems in the Northern Hemisphere provide a significant sink for atmospheric CO2; however, estimates of the magnitude and distribution of this sink varyExpand
Recent patterns and mechanisms of carbon exchange by terrestrial ecosystems
Knowledge of carbon exchange between the atmosphere, land and the oceans is important, given that the terrestrial and marine environments are currently absorbing about half of the carbon dioxide thatExpand
Consistent Land- and Atmosphere-Based U.S. Carbon Sink Estimates
For the period 1980–89, we estimate a carbon sink in the coterminous United States between 0.30 and 0.58 petagrams of carbon per year (petagrams of carbon = 1015 grams of carbon). The net carbon fluxExpand
Fate of soil‐applied black carbon: downward migration, leaching and soil respiration
Black carbon (BC) is an important pool of the global C cycle, because it cycles much more slowly than others and may even be managed for C sequestration. Using stable isotope techniques, weExpand
Is Nitrogen Deposition Altering the Nitrogen Status of Northeastern Forests?
Abstract Concern is resurfacing in the United States over the long-term effects of excess nitrogen (N) deposition and mobility in the environment. We present here a new synthesis of existing dataExpand
Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern U.S.A.
This work provides an understanding of the sources of N in landscapes, and highlights how human activities impact N cycling in the northeast region. Expand
Increased tree carbon storage in response to nitrogen deposition in the US
Spatially extensive evidence for nitrogen-induced stimulation of forest growth has been lacking. Analysis of forest inventory data from the northeastern and north-central US collected during theExpand
Sources of nitrate in rivers draining sixteen watersheds in the northeastern U.S.: Isotopic constraints
The feasibility of using nitrogen and oxygenisotope ratios of nitrate (NO3−) forelucidating sources and transformations ofriverine nitrate was evaluated in a comparativestudy of 16 watersheds in theExpand
Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern U.S.A.
Human activities have greatly altered the nitrogen (N) cycle, accelerating the rate of N fixation in landscapes and delivery of N to water bodies. To examine relationships between anthropogenic NExpand
Soil Carbon Dynamics after Forest Harvest: An Ecosystem Paradigm Reconsidered
In one of the most influential studies in the recent history of forest ecology, W. W. Covington (1981) described a pattern in organic matter storage in the forest floors of northern hardwood standsExpand