Now showing items 21-30 of 295
Burn severity influences postfire CO2 exchange in Arctic tundra
(Ecological Society of America, 2011-03)
Burned landscapes present several challenges to quantifying landscape carbon balance. Fire scars are composed of a mosaic of patches that differ in burn severity, which may influence postfire carbon budgets through damage ...
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 ...
Modeling coupled biogeochemical cycles
(Ecological Society of America, 2011-02)
Organisms require about 30 essential elements to sustain life. The cycles of these elements are coupled to one another through the specific physiological requirements of the organisms. Here, I contrast several approaches ...
Biomass and toxicity responses of poison ivy (Toxicodendron radicans) to elevated atmospheric CO2 : reply
(Ecological Society of America, 2008-02)
Aggregate measures of ecosystem services : can we take the pulse of nature?
(Ecological Society of America, 2005-02)
National scale aggregate indicators of ecosystem services are useful for stimulating and supporting a broad public discussion about trends in the provision of these services. There are important considerations involved in ...
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 ...
Impacts of ozone on trees and crops
In this review article, we explore how surface-level ozone affects trees and crops with special emphasis on consequences for productivity and carbon sequestration. Vegetation exposure to ozone reduces photosynthesis, ...
Turnover rates of nitrogen stable isotopes in the salt marsh mummichog, Fundulus heteroclitus, following a laboratory diet switch
Nitrogen stable isotopes are frequently used in ecological studies to estimate trophic position and determine movement patterns. Knowledge of tissue-specific turnover and nitrogen discrimination for the study organisms is ...
Fate of nitrogen in riparian forest soils and trees : an N-15 tracer study simulating salmon decay
We introduced a 15N-NH4+ tracer to the riparian forest of a salmon-bearing stream (Kennedy Creek, Washington, USA) to quantify the cycling and fate of a late-season pulse of salmon-N, and, ultimately, mechanisms regulating ...
Soil respiration at mean annual temperature predicts annual total across vegetation types and biomes
(Copernicus Publications on behalf of the European Geosciences Union, 2010-07-09)
Soil respiration (SR) constitutes the largest flux of CO2 from terrestrial ecosystems to the atmosphere. However, there still exist considerable uncertainties as to its actual magnitude, as well as its spatial and interannual ...