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Tytuł pozycji:

Precision and accuracy of three alternative instruments for measuring soil water content in two forest soils of the Pacific Northwest.

Tytuł:
Precision and accuracy of three alternative instruments for measuring soil water content in two forest soils of the Pacific Northwest.
Autorzy:
Czarnomski, Nicole M.
Moore, Georgianne W.
Pypker, Tom G.
Licata, Julian
Bond, Barbara J.
Temat:
SOIL moisture
REFLECTOMETER
SOIL infiltration
TEMPERATURE
FORESTS & forestry
Źródło:
Canadian Journal of Forest Research; Aug2005, Vol. 35 Issue 8, p1867-1876, 10p, 3 Charts, 3 Graphs
Abstract (English):
We compared the accuracy and precision of three devices for measuring soil water content in both natural and repacked soils and evaluated their temperature sensitivity. Calibrations were developed for a capacitance instrument (ECH2O), a time domain reflectometry cable tester (CT), and a water content reflectometer (WCR) in soils collected from the Wind River and H.J. Andrews Experimental Forests. We compared these calibrations with equations suggested by manufacturers or commonly used in the literature and found the standard equations predicted soil moisture content 0%–11.5% lower (p < 0.0001) than new calibrations. Each new calibration equation adequately predicted soil moisture from the output for each instrument regardless of location or soil type. Prediction intervals varied, with errors of 4.5%, 3.5%, and 7.1% for the ECH2O, CT, and WCR, respectively. Only the ECH2O system was significantly influenced by temperature for the range sampled: as temperature increased by 1 °C, the soil moisture estimate decreased by 0.1%. Overall, the ECH2O performed nearly as well as the CT, and thanks to its lower cost, small differences in performance might be offset by deployment of a greater number of probes in field sampling. Despite its higher cost, the WCR did not perform as well as the other two systems. [ABSTRACT FROM AUTHOR]
Czasopismo naukowe
Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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