摘要
调查分析了黔西市北部地区杉木生长状况,探究了杉木的天然更新情况。设定黔西市北部地区为研究地点,所有林分均是天然更新,根据不同林龄将杉木分为0~10 a(T1)、10~20 a(T2)、20~30 a(T3)3组样地,调查样地杉木生长情况,对不同林龄下幼苗更新情况进行了分析。结果表明:①幼苗生长:T2林龄下,杉木平均树高最高、平均胸径和平均冠幅最大,和其他样地对比差异明显(P<0.05)(P表示组间对比情况,P<0.05说明组间对比差异明显,P>0.05,说明组间对比无差异),整体呈T2>T3>T1的趋势;②杉木多样化分析:Simpson指数、Shannon-Wiener指数、Pielou均匀度指数表示植物多样性,T2样地的Simpson指数、Shannon-Wiener指数、Pielou均匀度指数明显高于T1样地和T3样地(P<0.05);③幼林蓄积量、单株材积:同林龄的杉木幼林蓄积量差异比较大,10~20 a林龄蓄积量达到最高,和其他2组对比差异明显(P<0.05),T2样地的单株材积高于其他2组(P<0.05);④更新树种数量、更新新增株数:T2样地的更新树种数量、更新新增株数多于其他2块样地(P<0.05);⑤天然更新:T2样地的天然更新动态最佳,其次是T1,最后是T3。T2样地生长繁育能力好,枯枝落叶对土壤起到改良的作用,可促进林间天然更新。杉木在10~20 a林龄下,幼苗长势良好,幼林蓄积量、单株材积较高,林间天然更新动态最佳。
This paper investigates and analyzes the growth status of Cunninghamia lanceolata in the northern area of Qianxi city,and explores the natural renewal of Cunninghamia lanceolata.The northern area of Qianxi City was set as the research site,and all stands were naturally regenerated.Cunninghamia lanceolata were divided into three groups according to different forest ages:0~10 a(T1),10~20 a(T2)and 20~30 a(T3).The growth of Cunninghamia lanceolata in the sample areas was investigated,and the regeneration of seedlings under different forest ages was analyzed.The results show that①Seedling growth:at T2 stand age,the average tree height,average DBH and average crown width of Cunninghamia lanceolata were the highest,and the difference was significant compared with other plots(P<0.05).(P indicates the comparison between groups;P<0.05 indicates the obvious difference between groups;P>0.05 indicates no difference between groups)The overall trend was T2>T3>T1.②Diversity analysis of Cunninghamia lanceolata:Simpson index,Shannon-Wiener index and Pielou evenness index indicated plant diversity,and Simpson index,Shannon-Wiener index and Pielou evenness index of T2 plots were significantly higher than those of T1 plots and T3 plots(P<0.05).③Stock volume of young stands and individual tree volume:the stock volume of young stands of Cunninghamia lanceolata of the same age was significantly different,and the stock volume of 10~20 a stood reached the highest,which was significantly different from that of the other two groups(P<0.05).The stock volume per tree of T2 plot was higher than that of the other two groups(P<0.05).④The number of renewed tree species and the number of renewed new trees:The number of renewed tree species and the number of renewed new trees in the T2 plot were more than those in the other two plots(P<0.05).⑤Natural regeneration:The natural regeneration dynamic of T2 sample was the best,followed by T1,and finally T3.The growth and reproduction ability of T2 plots is good,and the dead branches and leaves
作者
张静
Zhang Jing(Qianxi Forestry Bureau,Qianxi 551500,Guizhou,China)
出处
《绿色科技》
2024年第7期107-110,共4页
Journal of Green Science and Technology
关键词
杉木
生长状况
天然更新
Cunninghamia lanceolata
growth status
natural regeneration
