气候变化领域集成服务门户(CCPortal): Role of thinning intensity in creating mixed hardwood and conifer forests within a Cryptomeria japonica conifer plantation: A 14-year study

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DOI	10.1016/j.foreco.2020.118184
	Role of thinning intensity in creating mixed hardwood and conifer forests within a Cryptomeria japonica conifer plantation: A 14-year study
	Negishi Y.; Eto Y.; Hishita M.; Negishi S.; Suzuki M.; Masaka K.; Seiwa K.
发表日期	2020
ISSN	0378-1127
卷号	468
英文摘要	For managers of conifer plantations, conversion to mixed hardwood and conifer forests is an important management goal. However, the extent to which thinning intensity affects stand volume and timber quantity and quality remains unclear. We investigated the growth of conifer and hardwood trees over 14 years (at 5 and 9 years after the first and second thinning operations, respectively) under unthinned (Control), 33% thinned (Weak), and 67% thinned (Intensive) treatments in a Cryptomeria japonica plantation. The diameter growth of both conifers and hardwoods, stand volume of hardwoods, and relative increment of stand volume of conifers increased with greater thinning intensity in the order of Control < Weak < Intensive, whereas the reverse was observed for the stand volume of conifers, dead conifer trees, and total yield of stand volume (i.e., gross production). These results suggest that intensive thinning can create large conifers and hardwoods, but reduces gross production. Mean annual tree ring width (ATRW), consistency of ATRW value, and mean crown ratio increased with increasing thinning intensity in the order of Control < Weak < Intensive, while height-to-diameter ratio (i.e., slenderness) showed the opposite trend. These findings suggest that timber quality (e.g., wood density, stiffness, visual grading) was better under Weak than under Intensive thinning. However, the production of large conifer timbers with homogeneous ATRW may offset reductions in quality. This study suggests that intensive thinning is a reliable method for rapidly creating mixed hardwood–conifer forests at the canopy level and producing large timbers of both conifer and hardwood species, whereas weak thinning is suitable for producing high-quality conifer timbers and maintaining net primary production, although repeated thinning is necessary. © 2020 Elsevier B.V.
英文关键词	Diameter growth; Intensive thinning; Management goals; Stand volume increment; Timber quality
语种	英语
scopus关键词	Forestry; Grading; Timber; Conifer plantations; Cryptomeria japonica; Hardwood species; Height-to-diameter ratio; Management goals; Net primary production; Repeated thinning; Thinning intensity; Hardwoods; coniferous forest; coniferous tree; forest management; forestry production; net primary production; plantation forestry; stand structure; thinning; tree ring; wood quality; Forestry; Hardwoods; Intensity; Production; Quality; Softwoods; Stand Volume; Thinning; Coniferophyta; Cryptomeria japonica
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155241
作者单位	Laboratory of Forest Ecology, Graduate School of Agricultural Science, Tohoku University, Naruko-onsen, Miyagi, 989-6711, Japan; Faculty of Agriculture, Iwate University, Morioka, Iwate 020-8550, Japan
推荐引用方式 GB/T 7714	Negishi Y.,Eto Y.,Hishita M.,et al. Role of thinning intensity in creating mixed hardwood and conifer forests within a Cryptomeria japonica conifer plantation: A 14-year study[J],2020,468.
APA	Negishi Y..,Eto Y..,Hishita M..,Negishi S..,Suzuki M..,...&Seiwa K..(2020).Role of thinning intensity in creating mixed hardwood and conifer forests within a Cryptomeria japonica conifer plantation: A 14-year study.Forest Ecology and Management,468.
MLA	Negishi Y.,et al."Role of thinning intensity in creating mixed hardwood and conifer forests within a Cryptomeria japonica conifer plantation: A 14-year study".Forest Ecology and Management 468(2020).