Chamber measurements of total ecosystem respiration (TER) in a native Canadian grassland ecosystem were made during two study years with different precipitation. The growing season (April–September) precipitation during 2001 was less than one-half of the 30-year mean (1971–2000), while 2002 received almost double the normal growing …
Journal: Agricultural And Forest Meteorology, Volume 130 (3-4): 237-253 (2005). DOI: 10.1016/j.agrformet.2005.04.002 Sites: CA-Let
Models used to estimate net ecosystem productivity (NEP) during climate change should first be shown to simulate the effects on NEP of interannual variability in current climates. Energy and CO2 fluxes simulated by the ecosystem model ecosys were compared …
Journal: Agricultural And Forest Meteorology, Volume 126 (1-2): 99-116 (2004). DOI: 10.1016/j.agrformet.2004.06.005 Sites: CA-Let
We measured the molecular and carbon isotopic composition of major leaf wax compound classes in northern mixed mesic prairie species (Agropyron smithii, Stipa viridula, Bouteloua gracilis, …
Journal: Oecologia, Volume 135 (1): 67-77 (2003). DOI: 10.1007/s00442-002-1157-4 Sites: CA-Let
Net ecosystem carbon dioxide (CO2) exchange (NEE) was measured in a northern temperate grassland near Lethbridge, Alberta, Canada for three growing seasons using the eddy covariance technique. The study objectives were to document how NEE and its major component processes—gross photosynthesis (GPP) and total ecosystem …
Journal: Global Change Biology, Volume 8 (7): 599-615 (2002). DOI: 10.1046/j.1365-2486.2002.00491.x Sites: CA-Let
We measured the stable isotope ratio of respired carbon dioxide at two spatial scales in a black spruce forest in northern Canada: CO2 released from the forest floor and CO2 released from the entire ecosystem at night. Despite wide variation in the δ13C values of organic matter among above-ground plant species, …
Journal: Tellus Series B-Chemical and Physical Meteorology., Volume 51 (2): n/a-n/a (1999). DOI: 10.3402/tellusb.v51i2.16306 Sites: CA-Let
Our objective was to measure the carbon isotope ratio of CO2 released by respiration (δr) within forest canopies at different times during the growing season and to use this information to estimate forest ecosystem carbon isotope discrimination. We made measurements in the three major forest types (black spruce, …
Journal: Global Biogeochemical Cycles, Volume 10 (4): 629-640 (1996). DOI: 10.1029/96gb02345 Sites: CA-Let