小陇山林区锐齿栎原始林群落的空间结构特征

Spatial structure characteristics of Quercus aliena var.acuteserrata primeval forest in Xiaolongshan forest area

【目的】研究甘肃小陇山林区锐齿栎原始林群落的空间结构特征,为小陇山林区锐齿栎次生林的经营提供参考。【方法】在小陇山林区选择锐齿栎原始林建立100m×100m的固定样地,运用每木定位调查数据和林分空间结构分析软件,分析锐齿栎原始林群落的林木分布格局、树种隔离程度和大小分化程度。【结果】锐齿栎原始林群落的平均角尺度为0.531,建群种锐齿栎种群的平均角尺度为0.526,主要伴生树种鹅耳枥、地锦槭、光叶泡花树、鄂椴、小叶鹅耳枥、川鄂鹅耳枥、水榆花楸的平均角尺度依次为0.586,0.535,0.604,0.556,0.604,0.634和0.559;该群落平均混交度为0.71,修正混交度为0.475;群落中主要树种的平均大小比数排序为辽东栎<锐齿栎<桦椴<鄂椴<鹅耳枥<地锦槭<水榆花楸<小叶鹅耳枥<川鄂鹅耳枥<光叶泡花树;树种优势度排序为锐齿栎>辽东栎>鹅耳枥>桦椴>地锦槭>鄂椴>小叶鹅耳枥>川鄂鹅耳枥>水榆花楸>光叶泡花树。【结论】锐齿栎原始林群落林木分布格局为轻微的团状分布,林内各树种高度混交,锐齿栎在林分中占绝对优势,该群落的空间结构特征可作为小陇山林区锐齿栎次生林目标林分的参考依据。

【Objective】This study investigated the spatial structure characteristics of Quercus aliena var.acuteserrataprimeval forest in Xiaolongshan forest area to provide reference for management of Q.aliena var.acuteserratasecondary forest.【Method】A fixed plot with area of 100m×100mwas established in Q.alienavar.acuteserrataprimitive forest in Xiaolongshan forest area,and per wood investigation data and software for stand spatial characteristics analyses were used to analyze the spatial distribution pattern,tree species isolation degree and size differentiation of Q.aliena var.acuteserrataforest community.【Result】Average uniform angle index of Q.alienavar.acuteserrataprimitive forest community was 0.531,and that of constructive species was 0.526.The average uniform angle indexes of main associated tree species Carpinus turczaninowii Hance,Acer mono Maxim,Meliosma cuneifolia Franch.var.glabriusculaCufed,Tilia oliveri Szyszyl,Carpinus turczaninowii Hance var stpulata winkl,Carpinus henryana.(Winkl)Win,and Sorbus alnifolia were 0.586,0.535,0.604,0.556,0.604,0.634 and 0.559,respectively.The average community mingling was 0.71,and that of the modified stand was 0.475.The community size of maincomposition species of was in an increasing order of Quercus liaotungensis Koidz<Q.alienavar.acuteserrata Maxim<Tilia chinensis Maxim<T.oliveri Szyszyl<C.turczaninowii Hance<A.mono Maxim<S.alnifolia<C.turczaninowii Hance var stpulata Winkl<C.henryana.(Winkl)Win<M.cuneifolia Franch.var.glabriuscula cufed.The dominance of tree species was in a descending order of Q.alienavar.acuteserrata Maxim>Q.liaotungensis Koidz >C.turczaninowii Hance>T.chinensis Maxim>A.mono Maxim>T.oliveri Szyszyl>C.turczaninowii Hance var stpulata Winkl>C.henryana.(Winkl)Win>S.alnifolia>M.cuneifolia Franch.var.glabriusculacuffed.【Conclusion】Q.aliena var.acuteserrata virgin forest trees had a slight clumped distribution with highly mixed tree species and Q.alienavar.acuteserratahad the absolute superiority.The spatial structure characteristics of Q.alienavirgin forest in Xiaolongshan forest area could be used as a reference for the management of Q.alienasecondary forest.