[논문]Effects of Thinning and Climate on Stem Radial Fluctuations of Pinus ponderosa and Pinus lambertiana in the Sierra Nevada

Andrew Hirsch; Sophan Chhin; Jianwei Zhang; Michael Premer

doi:10.7747/jfes.2023.39.2.81

Effects of Thinning and Climate on Stem Radial Fluctuations of Pinus ponderosa and Pinus lambertiana in the Sierra Nevada 원문보기

Journal of forest and environmental science, v.39 no.2, 2023년, pp.81 - 95

Andrew Hirsch (Division of Forestry and Natural Resources, West Virginia University) , Sophan Chhin (Division of Forestry and Natural Resources, West Virginia University) , Jianwei Zhang (United States Department of Agriculture Forest Service, Pacific Southwest Research Station) , Michael Premer (School of Forest Resources, University of Maine)

Abstract ▼ AI-Helper

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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표/그림 (9)

그림 Fig. 1. Map of study area—located in the southern portion of Lassen National Forest in northern California, just southwest of Lake Almanor. Map courtesy of Johnson et al. (2017).
표 Table 1. Summary table of trees that were measured with dendrometers
표 Table 2. General descriptive statistics of the combined species-treat-ment groups
그림 Fig. 2. Flow chart showing key stages of field data collection and data analysis steps. Close-up of point dendrometer (A) and HOBO data logger (B). Photos in A) and B) taken by Sophan Chhin.
그림 Fig. 3. Example output of the actual dendrometer data stem cyclic phases for an individual sugar pine tree, 126R30 (A), and for a portion of the normalized dendrometer data showing stem cyclic phases of the PILA_R30C0 treatment group (B). Yellow indicates contraction (phase 1), orange indicates expansion (phase 2), and red indicates stem radial increment (phase 3). Stem radial increment occurs when the stem expands further than the previous maximum.
그림 Fig. 4. Chester RAWs weather station for the measurement period. Data shown here is from the time of the first dendrometer measurement to the last dendrometer measurement.
표 Table 3. Significant correlations between growth variables
표 Table 4. Daily approach analysis
표 Table 5. Stem cycle approach analysis

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