Bending of Pinus jeffreyi in response to wind | Zendy

Stephen H. Bullock | Zendy; Juan F. Martínez-Osuna | Zendy; Eulogio LópezReyes | Zendy; José Luis Rodríguez-Navarro | Zendy

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Bending of Pinus jeffreyi in response to wind

Author(s) -

Stephen H. Bullock,

Juan F. Martínez-Osuna,

Eulogio LópezReyes,

José Luis Rodríguez-Navarro

Publication year - 2015

Publication title -

forest systems

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.455

H-Index - 25

eISSN - 2171-9845

pISSN - 2171-5068

DOI - 10.5424/fs/2015243-08292

Subject(s) - zoology , wind speed , mathematics , physics , biology , meteorology

Aim of study: To evaluate the degree of trunk sway in relation to wind velocity, with varying temporal integration and to compare this relation among seasons.

Area of study: Sierra de Juárez, Baja California, México

Materials and Methods: Displacements of a 19 m tall Jeffrey pine tree were recorded at 6 m from a three dimensional digital compass during one year, at c. 4 Hz. Adjacent wind speed at 6 m was recorded at 1 Hz.

Main results: Sway was essentially unaffected by wind in the same second but increasing dependence of cumulative displacement on average sustained wind speed was found for intervals of 1 to 60 minutes (r² up to 0.89). The relation is generally log-linear but apparently differs in parameters between seasons.

Research highlights: Wind-sway relations are clear from integration of several-to-many minutes. However, to estimate cumulative stress, sub-second data on sway are essential. Sub-second, precision measurements of sway can be registered from small, inexpensive sensors.

Keywords: biomechanics; Pinus jeffreyi; seasonality; stress accumulation; time series; tree bending.

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