Now showing items 31-40 of 321
Net exchanges of CO2, CH4, and N2O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming
(American Geophysical Union, 2011-05-13)
China's terrestrial ecosystems have been recognized as an atmospheric CO2 sink; however, it is uncertain whether this sink can alleviate global warming given the fluxes of CH4 and N2O. In this study, we used a process-based ...
The application of δ18O and δD for understanding water pools and fluxes in a Typha Marsh
The δ18O and δD composition of water pools (leaf, root, standing water, and soil water) and fluxes (transpiration, evaporation) were used to understand ecohydrological processes in a managed Typha latifolia L. freshwater ...
Biomass and toxicity responses of poison ivy (Toxicodendron radicans) to elevated atmospheric CO2 : reply
(Ecological Society of America, 2008-02)
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 ...
Root standing crop and chemistry after six years of soil warming in a temperate forest
Examining the responses of root standing crop (biomass and necromass) and chemistry to soil warming is crucial for understanding root dynamics and functioning in the face of global climate change. We assessed the standing ...
Is the northern high-latitude land-based CO2 sink weakening?
(American Geophysical Union, 2011-08-30)
Studies indicate that, historically, terrestrial ecosystems of the northern high-latitude region may have been responsible for up to 60% of the global net land-based sink for atmospheric CO2. However, these regions have ...
Historical carbon emissions and uptake from the agricultural frontier of the Brazilian Amazon
(Ecological Society of America, 2011-04)
Tropical ecosystems play a large and complex role in the global carbon cycle. Clearing of natural ecosystems for agriculture leads to large pulses of CO2 to the atmosphere from terrestrial biomass. Concurrently, the remaining ...
NLOAD : an interactive, web-based modeling tool for nitrogen management in estuaries
(Ecological Society of America, 2007-07)
Eutrophication of estuaries is an increasing global concern that requires development of new tools to identify causes, quantify conditions, and propose management options that address this environmental problem. Since ...
Nitrous oxide nitrification and denitrification 15N enrichment factors from Amazon forest soils
(Ecological Society of America, 2006-12)
The isotopic signatures of 15N and 18O in N2O emitted from tropical soils vary both spatially and temporally, leading to large uncertainty in the overall tropical source signature and thereby limiting the utility of isotopes ...
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 ...