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논문 기본 정보

자료유형
학술저널
저자정보
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) 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)
저널정보
강원대학교 산림과학연구소 Journal of forest and environmental science Journal of forest and environmental science 제39권 제2호
발행연도
2023.6
수록면
81 - 95 (15page)

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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.

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