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Full-Text Articles in Life Sciences
Forest Floor And Mineral Soil Respiration Rates In A Northern Minnesota Red Pine Chronosequence, Matthew Powers, Randall K Kolka, John Bradford, Brian Palik, Martin F. Jurgensen
Forest Floor And Mineral Soil Respiration Rates In A Northern Minnesota Red Pine Chronosequence, Matthew Powers, Randall K Kolka, John Bradford, Brian Palik, Martin F. Jurgensen
Michigan Tech Publications
We measured total soil CO2 efflux (RS) and efflux from the forest floor layers (RFF) in red pine (Pinus resinosa Ait.) stands of different ages to examine relationships between stand age and belowground C cycling. Soil temperature and RS were often lower in a 31-year-old stand (Y31) than in 9-year-old (Y9), 61-year-old (Y61), or 123-year-old (Y123) stands. This pattern was most apparent during warm summer months, but there were no consistent differences in RFF among different-aged stands. RFF represented an average of 4–13% of total soil respiration, and forest floor removal increased …
The Experimental Flow To The Colorado River Delta: Effects On Carbon Mobilization In A Dry Watercourse, Thomas S. Bianchi, David Butman, Peter A. Raymond, Nicholas D. Ward, Rory J. Kates, Karl W. Flessa, Hector Zamora, Ana Arellano, Jorge Ramirez, Eliana Rodriguez
The Experimental Flow To The Colorado River Delta: Effects On Carbon Mobilization In A Dry Watercourse, Thomas S. Bianchi, David Butman, Peter A. Raymond, Nicholas D. Ward, Rory J. Kates, Karl W. Flessa, Hector Zamora, Ana Arellano, Jorge Ramirez, Eliana Rodriguez
Marine Science Faculty Publications
Here we report on the effects of an experimental flood on the carbon cycling dynamics in the dry watercourse of the Colorado River in Mexico. We observed post-flood differences in the degree of decay, age, and concentration of dissolved organic carbon (DOC), as well as dissolved CH4 and CO2 concentrations throughout the study site. Our results indicate that this flooded waterway was a limited source of CH4 and CO2 to the atmosphere during the event and that DOC age increased with time of flooding. Based on our findings, we suggest that the interplay between storage and …
Permafrost Organic Carbon Mobilization From The Watershed To The Colville River Delta: Evidence From 14C Ramped Pyrolysis And Lignin Biomarkers, Xiaowen Zhang, Thomas S. Bianchi, Xingqian Cui, Brad E. Rosenheim, Chien-Lu Ping, Andrea J. M. Hanna, Mikhail Kanevskiy, Kathryn M. Schreiner, Mead A. Allison
Permafrost Organic Carbon Mobilization From The Watershed To The Colville River Delta: Evidence From 14C Ramped Pyrolysis And Lignin Biomarkers, Xiaowen Zhang, Thomas S. Bianchi, Xingqian Cui, Brad E. Rosenheim, Chien-Lu Ping, Andrea J. M. Hanna, Mikhail Kanevskiy, Kathryn M. Schreiner, Mead A. Allison
Marine Science Faculty Publications
The deposition of terrestrial-derived permafrost particulate organic carbon (POC) has been recorded in major Arctic river deltas. However, associated transport pathways of permafrost POC from the watershed to the coast have not been well constrained. Here we utilized a combination of ramped pyrolysis-oxidation radiocarbon analysis (RPO 14C) along with lignin biomarkers, to track the linkages between soils and river and delta sediments. Surface and deep soils showed distinct RPO thermographs which may be related to degradation and organo-mineral interaction. Soil material in the bed load of the river channel was mostly derived from deep old permafrost. Both surface and …