不同林龄马尾松人工林林下植物多样性研究

A Study on Species Diversity of Undergrowth Vegetation in Different Age Masson Pine Plantation

为了探明马尾松人工林林下植物多样性,在广西田林县乐里林场境内选择4、6、14年生马尾松人工林设置样地,研究了林下植物多样性的变化规律。结果表明:①3种林龄马尾松林林下灌木层种类显示4年生(47)>6年生(38)>14年生(30);而草本层种类则显示6年生(32)>4年生(30)>14年生(23)的规律。②林下灌木层的丰富度指数、Shannon-Wiener指数分别为30～47、2.4989～3.1513,随着林龄的增加而递减,而Simpon指数、Jsw指数和Jsi指数则依次为0.8901～0.9387、0.7230～0.8135和0.9096～0.9521,变化规律为4年生>14年生>6年生。③林下草本层的丰富度指数为6年生>4年生>14年生;而Shannon-Wiener指数、Simpon指数、Jsw指数和Jsi指数的变化规律为6年生>14年生>4年生。

In order to ascertain the species diversity of undergrowth vegetation in different age masson pine plantation,the variation of the species diversity of undergrowth vegetation in 4,6 and 14 years growth masson pine plantation in Leli Forest Farm,Tianlin County,Guangxi was researched.The results were as follows：（1）The change trend of undergrowth vegetation species in 3 kinds of different age masson pine plantation showed 4a（47species）6a（38species）14a（30 species）in shrub layer;while 6a（32species）4a（30species）14a（23species）in herb layer.（2） The species richness index and Shannon-Wiener Index were 30 ～47,2.4989～3.1513 respectively,both of them decreased with the increase of stand age.The Simpson’s diversity index,Pielou index（Jsw）and Pielou index（Jsi）were 0.8901～0.9387,0.7230～0.8135 and 0.9096～0.9521,the related statistics in 4a masson pine plantation was the highest while in 6a was the lowest in shrub layer.（3） The species richness index in 6a masson pine plantation was the highest while in 14a was the lowest in herb layer.The Shannon-Wiener Index,Simpson＇s diversity index,Pielou index（Jsw） and Pielou index（Js）i in 6a masson pine plantation was the highest while in 4a was the lowest in herb layer.