福建明溪丝栗栲次生林高径结构分析

Analysis of Height Diameter Structure of Castanopsis fargesii Secondary Forest in Mingxi Fujian

本文报导以丝栗栲为优势树种的天然次生林,在两次弱度间伐(TCR处理)、两次强度间伐(TCQ处理)和不间伐(TCK处理)不同经营措施下,林木径级结构和高度级结构特征及差异,分析了林木径级(高度级)与株数分布曲线。分析结果表明:TCK处理无论是径级结构还是高度级结构,林木都比较集中在低级别范围分布,林木径级(高度级)与株数分布均呈倒"J"型,具有充沛的后备资源。TCQ处理林木径级结构和高度级结构趋向于高级别分布,保留木径向生长和纵向生长都得到提高,林木径级(高度级)与株数关系呈正态分布,单峰偏右,适合大径级用材林的培育方向。TCR处理林木径级结构和高度级结构介于TCK和TCQ处理之间,较适合培育中小径级食用菌专用材。

This paper reports the characteristics and differences of diameter-grade structure and height-grade structure of natural secondary forests with Castanopsis fargesii as dominant species under different management measures of two weak thinning(TCR),two intensive thinning(TCQ)and no thinning(TCK),and analyses the curve of diameter-grade(height-grade)and tree number distribution.The results showed that both diameter-grade structure and height-grade structure of TCK treatments were concentrated in the low-level range,and the diameter-grade(height-grade)distribution of TCK treatments was inverted“J”type with abundant reserve resources.The diameter-grade structure and height-grade structure of trees treated with TCQ tended to concentrate on the high-level distribution,and the radial and vertical growth of retained trees were improved.The relationship between diameter-grade(height-grade)and tree number was normal distribution,and the single peak was on the right,which was suitable for the cultivation direction of large-diameter timber forests.The diameter-grade and height-grade structure of trees treated with TCR were between those treated with TCK and TCQ,which was more suitable for cultivating edible fungi forests of small and medium size.