Earticle

초록

영어

Due to the multiple ecosystem benefits that iconic large, old growth trees provide, forest managers are applying thinning treatments around these legacy trees to improve their vigor and reduce mortality, especially in the face of climate change and other forest health threats. One objectives of this study was to analyze sub-hourly stem fluctuations of legacy ponderosa (Pinus ponderosa Dougl. Ex P. & C. Laws) and sugar pines (Pinus lambertiana Dougl.) in the mixed-conifer forests of the Sierra Nevada in multiple different radius thinning treatments to assess the short-term effects of these treatments. Thinning treatments applied were: R30C0 (9.1 m radius), R30C2 (9.1 m radius leaving 2 competitors), and RD1.2 (radius equaling DBH multiplied by 1 ft/in multiplied by 1.25). The other objective was to assess climatic drivers of hourly stem fluctuations. Using the dendrometeR package, we gathered daily statistics (i.e. daily amplitude) of the stem fluctuations, as well as stem cycle statistics such as duration and magnitude of contraction, expansion, and stem radial increment. We then performed correlation analyses to assess the climatic drivers of stem fluctuations and to determine which radial thinning treatment was most effective at improving growth. We found an important role that mean solar radiation, air temperature, and relative humidity play in stem variations of both species. One of the main findings from a management perspective was that the RD1.2 treatment group allowed both species to contract less on warmer and higher solar radiation days. Furthermore, sugar pine put on more stem radial increment on higher solar radiation days. These findings suggest that the extended radius RD1.2 thinning treatment may be the most effective at releasing legacy sugar and ponderosa pine trees compared to the other forest management treatments applied.

목차

Abstract
Introduction
Materials and Methods
Study site
Site selection & field methods
Analysis methods
Results
Climate data
Growth variable relationships
Daily perspective
Stem cycle perspective
Discussion
Growth variables
Daily perspective
Stem cycle perspective
Conclusions
Acknowledgements
References

키워드

저자

• Andrew Hirsch [ Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV 26506, USA ]
• Sophan Chhin [ Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV 26506, USA ] Corresponding Author
• Jianwei Zhang [ United States Department of Agriculture Forest Service, Pacific Southwest Research Station, Redding, CA 96002, USA ]
• Michael Premer [ School of Forest Resources, University of Maine, Orono, ME 04469, USA ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  Journal of Forest and Environmental Science [산림과학연구]

• 간기

  계간

• pISSN

  2288-9744

• eISSN

  2288-9752

• 수록기간

  1981~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 526 DDC 634