You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Factors Controlling Sediment Community Respiration in Woodland Stream Ecosystems
Lars O. Hedin
Vol. 57, No. 1 (Feb., 1990), pp. 94-105
Stable URL: http://www.jstor.org/stable/3565742
Page Count: 12
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
In shaded woodland streams, sediment community respiration is an important measure of decomposition of organic matter. In situ rates of community respiration were measured in sediments from shaded woodland streams at the Hubbard Brook Experimental Forest (HBEF), USA, by estimating rates of CO2 production in low-disturbance benthic chambers. Rates of sediment community respiration (range: 26-340 mg C· m-2· d) were closely correlated with amounts of sediment organic matter, but not with water column DOC or sediment size structure. Analysis of literature data indicated similar couplings between community respiration and sediment organic matter in other streams and in lakes and marine systems. However, respiration per unit organic matter was 23-fold higher in lakes and marine systems than in woodland streams, apparently due to differences in quality of organic matter (algae and macrophytes vs terrestrial detritus). In HBEF streams, community respiration was elevated in sediments of organic debris dams, suggesting that organic debris dams are focal sites of metabolism and nutrient regeneration in the stream channel.
Oikos © 1990 Nordic Society Oikos