摘要
为简化杉木块状整地提供依据,采用分层抽样法,调查黎平县立地指数18以上的采用暗穴和明穴块状整地方式造林的26 a生杉木纯林。结果表明:(1)26 a生杉木纯林的年均蓄积生长量为15.3 m^(3)/hm^(2),暗穴和明穴块状整地方式造林的杉木纯林年均蓄积生长量为16.1 m^(3)/hm^(2)和14.5 m^(3)/hm^(2);明穴和暗穴块状整地方式造林的杉木胸径、树高和单株材积的变异系数接近,变异系数呈单株材积>胸径>树高的趋势。(2)林分平均胸径、树高和单株材积呈现下坡>上坡>中坡的趋势;同一坡向的上坡和下坡林分平均胸径差异显著,树高差异极显著而单株材积不显著。(3)暗穴块状整地在南向的林分蓄积量最大为538.9 m^(3)/hm^(2),明穴块状整地在西北向的林分蓄积量最大为434.4 m^(3)/hm^(2),明穴块状整地东向的林分蓄积量最小为340.6 m^(3)/hm^(2);阴坡及半阴坡暗穴块状整地的林分胸径、树高和单株材积与明穴整地的差异不显著,阳坡及半阳坡暗穴块状整地的林分生长表现大于明穴块状整地的,且差异极显著。最佳立地选择是保障良种壮苗培育杉木商品林速生高产高效的关键,立地指数18以上的林地采用暗穴块状整地可有效降低造林成本和提高林分经济效益。
Chinese fir(Cunninghamia lanceolata)is one of the main afforestation tree species in Guizhou Province of China.A simple procedure of spot soil preparation can greatly contribute to the afforestation project.In this study,stratified sampling method was used to investigate the 26-years-old Chinese fir pure forest using spot soil preparation with the hidden and open holes.The site index above 18 was selected in the forest of Liping County,Guizhou Province,China.The results showed that:(1)The average annual volume growth was 15.3 m^(3)/hm^(2) for the pure Chinese fir forest.In terms of the spot soil preparation with the hidden and open holes,the average annual volume growth were 16.1 and 14.5 m^(3)/hm^(2),respectively.The similar variation coefficients were found in the diameter at breast height(DBH),tree height and volume of individual tree after spot soil preparation with the hidden and open holes.Specifically,the variation coefficients were ranked in the order of the individual volume>DBH>tree height.(2)The average DBH,tree height and volume of the individual tree shared the trend of the lower slope>upper slope>middle slope.There was the significance in the average DBH of the upper and lower slopes.The tree height was extremely significant correlation in the same slopping,whereas,there was no significance of the individual volume.(3)The maximum volume growth of tree forest was 538.9 m^(3)•/hm^(2) in the south after the spot soil preparation with the hidden hole.The maximum volume growth was 434.4 m^(3)/hm^(2) in the northwest after the spot soil preparation with the open hole.By contrast,the minimum volume growth was 340.6m^(3)/hm^(2) in the east after the spot soil preparation with the open hole.There were no significant differences in the DBH,tree height and volume of individual trees in the shady or semi-shady slope using the spot soil preparation with the hidden and open hole.But,the growth performance of individual trees in the sunny and semi-sunny slope with the hidden hole was greater than that with the open hole,indicating extremely significant difference.The optimal site selection is great guarantee for the fine breed and strong seedling with the fast growth,the high yield and efficiency of the commercial forest of Chinese fir.In the forest with more than 18 site index,the spot soil preparation with the hidden hole can outstandingly promote the afforestation quality and efficiency with the cost saving.
作者
龙永光
付品
陈波涛
LONG Yong-guang;FU Pin;CHEN Bo-tao(The Forest Bureau of Liping County,Liping,Guizhou 557300;Guizhou Walnut Research Institute,Guiyang,Guizhou 550005;Guizhou Academy of Forestry,Guiyang,Guizhou 550005)
出处
《贵州林业科技》
2022年第4期14-21,共8页
Guizhou Forestry Science and Technology
基金
贵州省科技计划项目(合同编号:黔科合成果[2019]4239号)
《黎平杉木育种国家长期科研基地》资助。
关键词
杉木
块状整地
暗穴
明穴
立地条件
生长效应
Chinese Fir
Spot soil preparation
Hidden hole
Open hole
Site condition
Growth effect
