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The Effects of Precommercial Thinning on the Growth and Yield of Lodgepole Pine

其他書名	25-year Results
出版	Ministry of Forests & Range, 2011
URL	http://books.google.com.hk/books?id=5QVbywAACAAJ&hl=&source=gbs_api

註釋The effects of precommercial thinning 56-year-old lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) are reported 25 growing seasons after treatment. Four post-thinning stand densities of 500, 1000, 1500, and 2000 trees per hectare, plus unthinned controls, were established on plots in central British Columbia. Both individual-tree and per-hectare data were analyzed. With the exceptions of mean height and periodic height growth, thinning had a statistically significant effect on all of the characteristics examined. Although this report provides only short-term information on the effects of thinning on the growth and yield of lodgepole pine, it does indicate the need to optimize individual-tree growth rates with levels of growing stock to maximize yield per unit area.