摘要
通过样地调查，运用重要值、丰富度、多样性、均匀度等指标，研究玉林市福绵管理区大义林场马尾松人工林、杉木人工林、巨尾桉人工林和红椎人工林林下植物的物种多样性。结果表明：（1）人工林林下植物种类比较丰富，群落物种数为54～62种，平均为58±3．36，灌木层的物种数为39～51种，平均45±4．97，草本层的物种数为11～15种，平均13±2．31。（2）Shannon—Wiener指数的变化值在0．6915±2．9972之间，灌木层的物种多样性高于草本层的多样性；灌木层的多样性比较接近，变化在2．7985±3．3037之间；草本层的多样性变化较大，在0．2626±1．8930之间；多样性最大值出现在巨尾桉人工林，马尾松人工林最小；均匀度变化在0．1710±0．7318之间，均匀度的变化规律与Shannon—Wiener指数的变化规律相似。（3）各种人工林林下植物的相似程度比较高，共有种达37．78％～53．78％。（4）人工林林下植物多样性取决于环境条件、林分结构和人为干扰强度，与人工林树种无关。
An investigation was conducted on the species diversity of different plantations （including： Pinus massoniana, Cunninghamia lanceolata, Eucalyptus grandis X Eucalyptus urophyUa, and Castanopsis hystrix plantations） in Dayi Forest Farm, Yulin City of Guangxi. The results were as foUows： （1）The plant species of the plantations were rich, there were 54- 69 species in community （average was 58±3.36）, 39-51 species in shrub layer （average was 45±4.97） and 11-15 species in herb layer （average was 13±2.31）. （9.）The variation of Shannon-Wiener index among plantations was 0. 6915-2. 9979 in community,9. 7985~3. 3037 in shrub layer, 0.2626- 1. 8930 in herb layer. Eucalyptus grandis X Eucalyptus urophylla plantation had the biggest Shannon-Wiener index and Pinus massoniana plantation had the smallest index. The variation of evenness index among plantations was from 0. 1710 to 0. 7318 and similar to Shannon-Wiener index. （3）The plantations were high in similarity, and the species numbers in the two plantations mentioned above were from 37.78% to 53.78%. （4）The plant species diversity of plantations depended on environmental condition, structure of stand and disturbance, and had nothing to do with the tree species of plantation.
出处
《广西科学》
CAS
2006年第4期316-320,共5页
Guangxi Sciences
关键词
植被
物种多样性
植物相似性
人工林
vegetation,species diversity, plant similarity, plantation
