TW003

Sap flow measurements to estimate overstory water use in Watersheds 1 and 2, Andrews Experimental Forest, 1999-2002

• Creator(s): Barbara J Bond, Georgianne W. Moore
• PI(s): Barbara J Bond
• Originator(s): Georgianne W. Moore
• Other researcher(s): Julia A. Jones, David A. Post, Nathan Phillips
• Dates of data collection: Jun 1 1999 - Sep 30 2002
• Data collection status: Study collection is completed and no new collection is planned
• Data access: Online
• Last update: Sep 7 2007 (Version 5)

<Citation>     <Acknowledgement>     <Disclaimer>    

Bond, B.; Moore, G. 2007. Sap flow measurements to estimate overstory water use in Watersheds 1 and 2, Andrews Experimental Forest, 1999-2002. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: http://andlter.forestry.oregonstate.edu/data/abstract.aspx?dbcode=TW003. Accessed 2024-05-07.

Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.

While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is". The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.

ABSTRACT:
	This study investigates how differences in tree age, stand structure and species composition between an old and young Douglas-fir/western hemlock forest impacts overstory transpiration. We measured sap flow (using constant-heat thermal dissipation sensors in g/m2) during the growing season in samples of trees in Watershed 1 (harvested in the 1960's) and Watershed 2 (last major disturbance approximately 450 ybp) at the HJ Andrews Forest in the Western Cascades of Oregon. The trees selected for these measurements differ somewhat each year but all are PSME. Sap flow was scaled to the whole tree level (per unit sapwood area) from measurements in outer and inner portions of the sapwood. We also surveyed vegetation in plots arrayed along transects in a 100 m swath centered on the streambed in each watershed, determining the species composition as well as the basal area (m2/ha) and sapwood basal area by species (m2/ha) . From the sap flow measurements in the sampled trees and the vegetation surveys, we estimated overstory water use within the 100 m swath. Data collection occurred between 1999-2002 and is now complete.

Study Description

Taxonomic Hierarchy

Download Study Location Information: (CSV) Ecological Metadata Language: (EML)

ENTITY TITLES:
1	Sapflow 1999-2000	METADATA	DATA
2	Time domain reflectometry (soil moisture) data	METADATA	DATA
3	Water content reflectometer (soil moisture) data	METADATA	DATA
4	Riparian vegetation survey	METADATA	DATA
5	Sapflow 2001 - 2002 (Apr 1 2001 - Aug 1 2002)	METADATA	DATA
	This file consists of sap flow data from the upper and lower replacement series plots for the period from April 2001 through August 2002. Note that all data after day 117 of 2002 are corrected for sensor degradation (see Ch.3 of dissertation Moore 2003).
6	Time domain reflectometry (soil moisture) data, 2001 - 2002 (May 1 2001 - Jul 1 2002)	METADATA	DATA
	This file consists of time domain reflectometry (soil moisture) data from the upper and lower replacement series sites for the period from May 2001 through July 2002
7	Vegetation Survey 2002	METADATA	DATA
	This file consists of vegetation survey data from the upper and lower replacement series sites taken in summer 2002.
RELATED PUBLICATIONS:
	Moore, Georgianne W., Bond, Barbara J., Jones, Julia A., Phillips, Nathan, Meinzer, Frederick C. 2004, Structural and compositional controls on transpiration in 40- and 450-year-old riparian forests in western Oregon, USA (Pub. No: 3772)
	Moore, Georgianne W. 2003, Drivers of variability in transpiration and implications for stream flow in forests of western Oregon (Pub. No: 3738)