Now showing items 41-50 of 262
Effect of historical changes in land use and climate on the water budget of an urbanizing watershed
(American Geophysical Union, 2006-03-25)
We assessed the effects of historical (1931-1998) changes in both land-use and climate on the water budget of a rapidly urbanizing watershed, Ipswich River basin (IRB), in northeastern Massachusetts. Water diversions and ...
Importance of carbon-nitrogen interactions and ozone on ecosystem hydrology during the 21st century
(American Geophysical Union, 2009-03-18)
There is evidence that increasing CO2 concentrations have reduced evapotranspiration and increased runoff through reductions in stomatal conductance during the twentieth century. While this process will continue to counteract ...
Correction to “Importance of carbon-nitrogen interactions and ozone on ecosystem hydrology during the 21st century”
(American Geophysical Union, 2009-08-22)
N budgets and aquatic uptake in the Ipswich River basin, northeastern Massachusetts
(American Geophysical Union, 2004-11-05)
We calculated N budgets and conducted nutrient uptake experiments to evaluate the fate of N in the aquatic environment of the Ipswich River basin, northeastern Massachusetts. A mass balance indicates that the basin retains ...
Seasonal use of a New England estuary by foraging contingents of migratory striped bass
(American Fisheries Society, 2009-12-10)
Using acoustic telemetry on migratory striped bass Morone saxatilis in Plum Island Estuary (PIE), Massachusetts, we found that striped bass (335–634 mm total length) tagged in the spring and summer of 2005 (n = 14) and ...
Objective indicators of pasture degradation from spectral mixture analysis of Landsat imagery
(American Geophysical Union, 2008-07-23)
Degradation of cattle pastures is a management concern that influences future land use in Amazonia. However, “degradation” is poorly defined and has different meanings for ranchers, ecologists, and policy makers. Here we ...
A pan-arctic evaluation of changes in river discharge during the latter half of the 20th century
(American Geophysical Union, 2006-03-30)
Several recent publications have documented changes in river discharge from arctic and subarctic watersheds. Comparison of these findings, however, has been hampered by differences in time periods and methods of analysis. ...
CO2 and CH4 exchanges between land ecosystems and the atmosphere in northern high latitudes over the 21st century
(American Geophysical Union, 2006-09-15)
Terrestrial ecosystems of the northern high latitudes (above 50oN) exchange large amounts of CO2 and CH4 with the atmosphere each year. Here we use a process-based model to estimate the budget of CO2 and CH4 of the region ...
Decreased mass specific respiration under experimental warming is robust to the microbial biomass method employed
Hartley et al. question whether reduction in Rmass, under experimental warming, arises because of the biomass method. We show the method they treat as independent yields the same result. We describe why the substrate-depletion ...
The regional and global significance of nitrogen removal in lakes and reservoirs
Human activities have greatly increased the transport of biologically available N through watersheds to potentially sensitive coastal ecosystems. Lentic water bodies (lakes and reservoirs) have the potential to act as ...