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Growth Monitoring of Korean White Pine (Pinus koraiensis) Plantation by Thinning Intensity

간벌강도에 따른 잣나무 인공림의 생장변화 모니터링

  • Received : 2014.01.15
  • Accepted : 2014.07.10
  • Published : 2014.09.30

Abstract

This study was conducted to investigate growth changes of DBH, height, crown width, volume, stem biomass, and dead trees after thinning treatments with different thinning intensity for Korean white pine (Pinus koraiensis) plantation. First thinning was applied with 29~69% intensity based on number of trees in 19-yearold plantation, and trees were measured three times: right after thinning (19-year-old), 5 years later (24-yearold), 12 years later (29-year-old). In the case of DBH growth, average DBH growth of heavily thinned plots was 19.6~19.9% higher 5 years later, and 13.3~24.7% higher 12 years later, compared to that of unthinned plots. Initial diameter growth rate was higher than late growth rate. The proportion of large pole candidates ($DBH{\geq}25cm$) was 31% in heavily thinned plot while only 2% was shown in unthinned plot. No difference was shown in height growth depending on plots, and average crown width growth in heavily thinned plots was 30.6~33.3% higher, 5 years later, and 35.0~40.0% higher, 12 years later, compared to that of unthinned plots. Average volume growth of individual trees in heavily thinned plots was 39.8~46.8% higher, 5 years later, and 23.0~52.0% higher, 12 years later, compared to unthinned plots. The maximum volume and biomass per unit area were shown in unthinned plot; the volume and biomass 5 and 12 years later after thinning were $133m^3/ha$ (51 kg/ha) and $344m^3/ha$ (132 kg/ha), respectivily. The significant difference appeared in crown width, volume, and biomass depending on thinning intensity. No dead trees occurred in heavily thinned plots for 12 years after thinning, while mortality rate in unthinned plots was 27.9~37.8%. As a result of analyzing annual increment using cores to determine the timing of second thinning, it suggested that second thinning be suitable around 10 years after first thinning.

Keywords

DBH growth rate;volume growth;stem biomass;mortality;second thinning

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  1. A Meta-analysis on the Effect of Forest Thinning on Diameter Growth and Carbon Stocks in Korea vol.104, pp.4, 2015, https://doi.org/10.14578/jkfs.2015.104.4.527
  2. Effect of thinning intensity on tree growth and temporal variation of seed and cone production in a Pinus koraiensis plantation pp.1993-0607, 2018, https://doi.org/10.1007/s11676-018-0690-x