Long-Term Ecological Research (LTER)/AND002: Respiration Patterns of Logs in H.J. Andrews Experimental Forest

Periodically the cylinders are capped and CO2 evolved is trapped in 0.1 N NaOH solution. Because of the variation in respiration rate, the amount of solution has varied from 20 to 80 ml. Exposed solutions are then processed by first adding excess BaCl solution, filtering the precipitate and then titrating with 0.1 N HCl.

Solutions vary in the degree they absorb CO2. The final calculated value has been adjusted to reflect the changes in trap efficiency brought about by CO2-absorption. The Andrews Forest is in the western Cascade Range of Oregon in the 15,800-acre drainage basin of the Lookout Creek, a tributary of Blue River and the McKenzie River.

The area elevation ranges from 1350 feet to 5340 feet and contains excellent examples of Pacific Northwest conifer forests, wildlife, and ecosystems. Information about the Long-Term Ecological Research (LTER) Program can be obtained from: LTER Network Office College of Forest Resources AR-10 University of Washington Seattle, WA 98195 Phone: 206-543-4853 FAX: 206-685-0790 Email: office@lternet.edu "lternet.edu" or National Science Foundation Division of Environmental Biology Long-Term Projects in Environmental Biology Phone: 202-357-9596 Email: jcallaha@nsf.gov