摘要
以金洞林场杉木纯林、杉木-闽楠混交林为研究对象,对不同密度和混交比例的林分进行研究,将物种多样性指数作为衡量林分密度和混交比例是否合理的参考指标,为人工混交林的经营提供理论依据。采用典型抽样法,按其混交比例分为类型Ⅰ(10杉)、类型Ⅱ(9杉1楠)、类型Ⅲ(7杉3楠)、类型Ⅳ(5杉5楠)4种类型设置典型样地,同种类型林分设置3个密度等级,低密度(A:600~1000株/hm^2)、中密度(B:1200~1600株/hm^2)、高密度(C:2000~2400株/hm^2),对比分析其林下植被物种组成及多样性差异。结果表明:从类型Ⅰ至类型Ⅳ随着闽楠比例的增加其林下植被的物种数增加。林下灌木及草本Patrick丰富度指数、Shannon-Wiener多样性指数、Simpson优势度指数表现为类型Ⅳ>类型Ⅲ>类型Ⅱ>类型Ⅰ。林分密度及混交比例与林下灌木及草本层的物种多样性指数呈显著(P<0.05)或极显著相关关系(P<0.01);拟合曲线表明林下植被Shannon-Wiener多样性指数和Patrick丰富度指数达峰值时的闽楠比例为0.465~0.506,即闽楠比例在46.5%~50.6%之间其林下植被物种多样性达到最大值。物种多样性指数与密度及混交比例均具有显著或极显著相关关系,可将物种多样性作为确定杉木-闽楠混交林最适密度和混交比例的因子之一。当前阶段,金洞林场杉木-闽楠混交林最适密度为1200~1600株/hm^2,杉木与闽楠的株数比例控制在0.97~1.10之间。
Taking pure Chinese fir forest and mixed Chinese fir-Phoebe bournei forest in Jindong forest farm as the research objects, this paper studied the stands with different densities and mixed proportions, and took the species diversity index as a reference index to judge whether the density and mixed proportions were reasonable or not, which provide theoretical basis for the management of artificial mixed forest. Typical sampling method was used to divide the mixed proportion into four types: type Ⅰ(10 fir), type Ⅱ(9 fir 1 Nan), type Ⅲ(7 fir 3 Nan), type IV (5 fir 5 Nan).The same type of forest set three density grades, low density (A:600-1 000 plants/hm^2). Medium density (B: 1 200-1 600 plants/hm^2) and high density (C: 2 000-2 400 plants/hm^2) were used to compare and analyze the species composition and diversity of understory vegetation. Results showed that the species number of understory vegetation increased with the increase of the proportion of Phoebe bournei from type Ⅰ to type IV. Patrick richness index, Shannon-Wiener diversity index and Simpson dominance index of undergrowth shrubs and herbs were type Ⅳ> type Ⅲ> type Ⅱ> type Ⅰ. Species diversity index of shrubs and herbage layers was significantly (P < 0.05) or highly significant (P < 0.01) correlated with stand density and mixed proportion;the fitting curve indicates that Shannon-Wiener diversity index and Patrick richness index reached the maximum value when the proportion of Phoebe bournei were 0.465-0.506, that is, the proportion of Phoebe bournei was 46.5%-50.6% the species diversity reaches its maximum. Species diversity index has significant or extremely significant correlation with density and mixing proportion. Species diversity can be used as one of the factors to determine the optimum density and mixing proportion of Chinese fir-Phoebe bournei mixed forest. At present, the optimum density of the mixed forest of Chinese fir and Phoebe bournei in Jindong forest farm is 1 200-1 600 plants/hm^2, and the proportion of Chinese fir and
作者
王奕茹
李际平
曹小玉
唐涛
WANG Yiru;LI Jiping;CAO Xiaoyu;TANG Tao(College of Forestry, Central South University of Forestry and Technology, Changsha 410004, Hunan, China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2019年第6期30-37,共8页
Journal of Central South University of Forestry & Technology
基金
全国森林经营科技支撑科研专项(169201531-6)
湖南省研究生科研创新项目(CX2018B449)
中南林业科技大学研究生科技创新基金(20183004)
关键词
杉木-闽楠混交林
混交比例
林分密度
物种多样性
Mixed forest of Chinese fir and Phoebe bournei
mixed proportion
stand density
species diversity
