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Exploratory Tree Survey (2016 - Eel River Critical Zone Observatory - Sagehorn - Central Belt Melange, Franciscan Complex, Northern California Coast Ranges, USA)

Authors: W. Jesse Hahm · David N Dralle · Sky M Lovill · Jennifer Rose · Todd Dawson · William E Dietrich
Owners: W. Jesse Hahm
DOI:10.4211/hs.7881821a5c0e4ae3822b96a59f4bf8b6 How to Cite
Resource type:Composite Resource
Created:Sep 18, 2017 at 3:18 p.m.
Last updated: Oct 04, 2017 at midnight by W. Jesse Hahm


We surveyed more than 2,800 individual trees over an approximately 10 hectare area May 2-5, 2016 at the Eel River Critical Zone Observatory Sagehorn site in Mendocino County, California, USA. Trees species, size (height for juvenile and diameter for mature individuals), canopy position (for mature individuals), and location (meter-scale resolution GPS) were recorded. The survey area is a small portion of a 5,000 acre private cattle ranch that experienced a large fire in 1950 and some logging of Douglas fir in the first half of the twentieth century. The hilly landscape is part of the Central Belt Melange of the Franciscan Formation complex, and surveyed areas were underlain by sheared clay-rich melange matrix (dominant vegetation: annual herbaceous groundcover and Quercus garryana (Oregon White Oak)), as well as poorly sorted, immature sandstone blocks (greywacke; dominant vegetation: Arctostaphylos spp (Manzanita - not surveyed), Pseudotsuga menziesii (Douglas Fir) and Arbutus menziesii (Pacific Madrone)). Trees with diameters at breast height (1.4 m; DBH) greater than 5 cm (n = 313) were tagged for future surveys.

Subject Keywords

Central belt melange,Oak savanna,Sagehorn,Northern California,Eel River Critical Zone Observatory,Tree survey,Quercus garryana,Franciscan Complex

How to cite

Hahm, W. J., D. N. Dralle, S. M. Lovill, J. Rose, T. Dawson, W. E. Dietrich (2017). Exploratory Tree Survey (2016 - Eel River Critical Zone Observatory - Sagehorn - Central Belt Melange, Franciscan Complex, Northern California Coast Ranges, USA), HydroShare, https://doi.org/10.4211/hs.7881821a5c0e4ae3822b96a59f4bf8b6

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     Coordinate System/Geographic Projection:  WGS 84 EPSG:4326
     Coordinate Units:  Decimal degrees


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    The people or organizations that created the intellectual content of the resource.

    Name Organization Address Phone Author Identifiers
    W. Jesse Hahm UC Berkeley
    David N Dralle UC Berkeley
    Sky M Lovill UC Berkeley
    Jennifer Rose UC Berkeley
    Todd Dawson UC Berkeley
    William E Dietrich UC Berkeley


    This resource was created using funding from the following sources:
    Agency Name Award Title Award Number
    National Science Foundation The Eel River Critical Zone Observatory: exploring how the critical zone will mediate watershed currencies and ecosystem response in a changing environment 1331940
    University of California Natural Reserve System Mildred E. Mathias Graduate Student Research Grant


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