Now showing items 21-30 of 290
Eutrophication in Portuguese estuaries evidenced by δ15N of macrophytes
Terrestrial inputs of nitrogen in estuaries are increasing and altering salt marsh primary production, plant communities and associated biota. We used N isotope ratios and %N in Spartina maritima, Halimione portulacoides, ...
Residence time distributions in surface transient storage zones in streams : estimation via signal deconvolution
(American Geophysical Union, 2011-05-11)
Little is known about the impact of surface transient storage (STS) zones on reach-scale transport and the fate of dissolved nutrients in streams. Exchange with these locations may influence the rates of nutrient cycling ...
High particle export over the continental shelf of the west Antarctic Peninsula
(American Geophysical Union, 2010-11-24)
Drifting cylindrical traps and the flux proxy 234Th indicate more than an order of magnitude higher sinking fluxes of particulate carbon and 234Th in January 2009 than measured by a time-series conical trap used regularly ...
Biomass and toxicity responses of poison ivy (Toxicodendron radicans) to elevated atmospheric CO2 : reply
(Ecological Society of America, 2008-02)
Discharge–calcium concentration relationships in streams of the Amazon and Cerrado of Brazil : soil or land use controlled
Stream discharge-concentration relationships are indicators of terrestrial ecosystem function. Throughout the Amazon and Cerrado regions of Brazil rapid changes in land use and land cover may be altering these hydrochemical ...
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems
(Ecological Society of America, 2005-08)
Leaf area index (LAI) is a powerful diagnostic of plant productivity. Despite the fact that many methods have been developed to quantify LAI, both directly and indirectly, leaf area index remains difficult to quantify ...
Susceptibility of salt marshes to nutrient enrichment and predator removal
The sustainability of coastal ecosystems in the face of widespread environmental change is an issue of pressing concern throughout the world (Emeis et al. 2001). Coastal ecosystems form a dynamic interface between terrestrial ...
Soil hydraulic response to land-use change associated with the recent soybean expansion at the Amazon agricultural frontier
Clearing for large-scale soy production and the displacement of cattle-breeding by soybeans are major features of land-use change in the lowland Amazon that can alter hydrologic properties of soils and the runoff generation ...
Recent changes in nitrate and dissolved organic carbon export from the upper Kuparuk River, North Slope, Alaska
(American Geophysical Union, 2007-11-08)
Export of nitrate and dissolved organic carbon (DOC) from the upper Kuparuk River between the late 1970s and early 2000s was evaluated using long-term ecological research (LTER) data in combination with solute flux and ...
Soil warming accelerates decomposition of fine woody debris
Soil warming from global climate change could increase decomposition of fine woody debris (FWD), but debris size and quality may mitigate this effect. The goal of this study was to investigate the effect of soil warming ...