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不同立地条件下杉木人工林材种结构 间伐效应的长期定位研究
杨桂娟,段爱国,邓伦秀,孙建军,相聪伟,张建国
0
(中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京 100091;贵州省林业科学研究院,贵阳 550011;中国林业科学研究院亚热带林业实验中心,分宜 336600)
摘要:
采用江西大岗山27年生不同间伐处理杉木人工林定位观测数据,研究了杉木林分活立木规格材材种结构间伐动态效应,得到3点主要结论:(1)不同间伐强度林分活立木规格材出材率随间伐强度和立地指数级的增大而增大;(2)林龄27年时,16立地指数级强度与中度间伐时大径材出材率较大,表现为中度间伐>强度间伐>对照>弱度间伐,分别为19.0%、17.1%、2.2%和1.8%,出材量分别为56.376、44.239、6.832和6.325 m3·hm-2;中径材出材率表现为对照>强度间伐>中度间伐>弱度间伐,分别为47.3%、42.3%、41.6%、24.2%,出材量分别为146.928、123.783、105.196和85.408 m3·hm-2;小径材出材率为弱度间伐>对照>中度间伐>强度间伐,分别为48.4%、25.9%、18.8%和17.8%,出材量分别为171.099、80.561、52.837 和47.121 m3·hm-2;(3)立地条件是杉木大径材培育的限制因子,而间伐可有效调控规格材出材比例,并提高规格材出材率。
关键词:  杉木  材种结构  间伐强度  立地指数  林龄
DOI:10.13610/j.cnki.1672-352x.20180619.008
基金项目:国家“十三五”重点研发计划课题“杉木速生材高效培育技术研究(2016YFD0600302)”和“十二五”国家科技支撑专题“杉木速生丰产林定向培育技术研究(2015BAD09B01)”共同资助。
Thinning effects on merchantable wood assortment structure of Cunninghamia lanceolata plantations with different site indices based on permanent data
YANG Guijuan,DUAN Aiguo,DENG Lunxiu,SUN Jianjun,XIANG Congwei,ZHANG Jianguo
(Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing?100091;Guizhou Academy of Forestry, Guiyang 550011;Experimental Center of Subtropical Forestry, Chinese Academy of Forestry,?Fenyi?336600)
Abstract:
The permanent data, originated from a 27-year-old Cunninghamia lanceolata plantation with different thinning treatments in Dagangshan Mountain, Jiangxi Province, was adopted to systematically study the dynamic change rules of wood assortment structure for the standing timber of Cunninghamia lanceolata stands. Three main conclusions were drawn: (1) the total wood assortment rates of standing timber in stands with different thinning intensities increased with the increase of thinning intensity and site index. (2) At the stand age of 27, the stand outturn rates of big-diameter timbers were relatively larger in the stands under intensive thinning and moderate thinning with 16-site-index class. The big-diameter timber outturn rates for different thinning intensities represented as moderate thinning > intensive thinning > control > slight thinning, and with the outturn rate of 19.0%, 17.1%, 2.2% and 1.8%,the outturn per hectare of 56.376 m3, 44.239 m3, 6.832 m3 and 6.325 m3, respectively. While the middle-diameter timber outturn rate represented as control > intensive thinning > moderate thinning > slight thinning, with the outturn rate of 47.3%, 42.3%, 41.6% and 24.2%,the outturn per hectare of 146.928 m3, 123.783 m3, 105.196 m3 and 85.408 m3, respectively. The small-diameter timber outturn rate represented as slight thinning > control > moderate thinning > intensive thinning, with the outturn rate of 48.4%, 25.9%, 18.8% and 17.8%,the outturn per hectare of 171.099 m3, 80.561 m3, 52.837 m3 and 47.121 m3, respectively; (3) the site index
Key words:  Cunninghamia lanceolata  wood assortment structure  thinning intensity  site index  stand age

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