Field performance of the Walker Branch throughfall displacement experiment

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Description

The authors are conducting a large-scale manipulative field experiments in an upland oak forest on the Walker Branch Watershed in eastern Tennessee USA to identify important ecosystem responses that might result from future precipitation changes. The manipulation of soil moisture is being implemented by a gravity-driven transfer of throughfall precipitation from one treatment plot to another. Throughfall is intercepted in {approx} 2,000 subcanopy troughs (0.3 x 5 m) suspended above the forest floor of the dry plots ({approx} 33% of the ground area is covered) and transferred by gravity flow across an ambient plot for subsequent distribution onto the wet ... continued below

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12 p.

Creation Information

Hanson, P. J.; Todd, D. E.; Edwards, N. T. & Huston, M. A. October 6, 1994.

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Description

The authors are conducting a large-scale manipulative field experiments in an upland oak forest on the Walker Branch Watershed in eastern Tennessee USA to identify important ecosystem responses that might result from future precipitation changes. The manipulation of soil moisture is being implemented by a gravity-driven transfer of throughfall precipitation from one treatment plot to another. Throughfall is intercepted in {approx} 2,000 subcanopy troughs (0.3 x 5 m) suspended above the forest floor of the dry plots ({approx} 33% of the ground area is covered) and transferred by gravity flow across an ambient plot for subsequent distribution onto the wet treatment plot. Percent soil water is being monitored with time domain reflectometers at 310 sampling locations across the site. The experimental system is able to produce statistically significant differences in soil water content in years having both extremely dry and extremely wet conditions. Furthermore, comparisons of pre- and post-installation soil temperature measurements have documented the ability of the experimental design to produce these changes without changing the microclimate of the forest understory.

Physical Description

12 p.

Notes

OSTI as DE95008677

Source

  • International symposium on ecosystem manipulation, Bowness-on-Windermere (United Kingdom), 19-21 Oct 1994

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  • Other: DE95008677
  • Report No.: CONF-9410327--1
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/41269 | External Link
  • Office of Scientific & Technical Information Report Number: 41269
  • Archival Resource Key: ark:/67531/metadc677020

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Creation Date

  • October 6, 1994

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 19, 2016, 1:41 p.m.

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Hanson, P. J.; Todd, D. E.; Edwards, N. T. & Huston, M. A. Field performance of the Walker Branch throughfall displacement experiment, report, October 6, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc677020/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.