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杉木林林层指数及其与林下灌木物种多样性的关系

曹小玉,李际平**,周永奇,邓超   

  1. (中南林业科技大学林学院, 长沙 410004)
  • 出版日期:2015-03-10 发布日期:2015-03-10

Stand layer index and its relations with species diversity of understory shrubs of Cunninghamia lanceolata plantations.

CAO Xiao-yu, LI Ji-ping**, ZHOU Yong-qi, DENG Chao   

  1. (School of Forestry, Central South University of Forestry & Technology, Changsha 410004, China)
  • Online:2015-03-10 Published:2015-03-10

摘要:

基于湖南省福寿林场不同龄组杉木林(幼龄林、中龄林、近熟林)18个固定样地的实测数据,对比分析了3个龄组杉木林林层指数与林下灌木物种多样性的变化特征,并对其相关性进行了分析。结果表明:不同龄组杉木林林层指数为0.134~0.507,不同龄组的杉木林林层指数存在显著性差异(P<0.05);林层指数普遍较低,林木对林分垂直方向的空间利用不足,林木分化程度较弱。随着杉木的生长发育,林下灌木的物种丰富度、Simpson多样性指数、Shannon多样性指数表现出了先增大后减少的变化趋势,幼龄林与中龄林之间的丰富度指数存在显著性差异(P<0.05),林下灌木的Simpson均匀性指数和Pielou均匀度指数随着杉木年龄的增加变化不大。林层指数与物种丰富度指数存在极显著的正相关性,说明林层指数是影响杉木林林下灌木丰富度的主要因素。
 

关键词: 林龄, 黄土丘陵区, 刺槐, 叶功能性状, 土壤养分

Abstract:

The variation characteristics of stand layer index and the species diversity of understory shrubs in three age groups (juvenile, medium and near mature) of Cunninghamia lanceolata stands and their correlations were analyzed based on the observation of C. lanceolata stands in eighteen permanent plots in Fushou Forest Farm of Hunan Province. The results showed that there were significant differences in stand layer index among different age groups (P<0.05). The stand layer index of the three age groups ranged from 0.134 to 0.507, indicating that stand layer index was generally low, the tree’s vertical space was underutilized, and the differentiation between individuals was weak. As C. lanceolata trees grew, species richness, Simpson diversity index and Shannon index of understory shrubs increased first and then decreased. There were significant differences in richness between the juvenile and medium stands (P<0.05), while the Simpson evenness and Pielou index of understory shrubs varied insignificantly with the increase of tree age. The species richness index had a very significant positive correlation with the stand layer index, indicating that stand layer index was an important factor influencing the richness index of understory shrubs of C. lanceolata stands.
 

Key words: soil nutrient, Loess Plateau hilly region, stand ageRobinia pseudoacacia, leaf functional trait