摘要
通过对崇明岛5年生人工马褂木林下草本植物分布及生长状况的调查,研究了不同郁闭度下草本植物物种多样性与林分郁闭度的关系。结果表明:在马褂木幼龄林中,随着林分郁闭度的增大,林下草本植物种数呈先增加后减少的趋势,郁闭度为0、(0,0.2]、(0.2,0.4]、(0.4,0.6]、(0.6,0.8]、(0.8,1.0]下的草本植物种数分别为16、16、19、15、9和7种;林下草本植物的平均盖度、平均密度与林分郁闭度在α=0.01水平上呈显著负相关(r盖度-郁闭度=-0.9643,r密度-郁闭度=-0.9815);林分郁闭度为(0.2,0.4]林下草本植物多样性指数最高,其中辛普森指数为0.7548,香农-威纳指数为1.3273,均匀度指数为0.8806。
Species, mean coverage, mean density and α-diversity index of the understory herbaceous plants were investigated in five-year-old Liriodendron chinense forest stands different in canopy density in Chongming Island of Shanghai. Resuits show that with canopy density increasing from 0, (0,0. 2], (0. 2,0. 4], (0. 4,0. 6], (0. 6,0. 8] and (0. 8,1.0], the number of understory herbaceous plant species displayed a rising-and-then-falling trend, like 16, 16, 19, 15, 9 and 7. Significant negative correlations were observed between the canopy density and the mean coverage of herbaceous plants ( r= -0. 964 3 ,P〈0. 01 ) and the mean density of herbaceous plants ( r= -0. 981 5 ,P〈0. 01 ) as well. The Simpson index, Shannon-Weiner index, and Pielou index peaked when the canopy density was (0. 2,0. 4] , being 0. 754 8, 1. 327 3, and 0. 880 6, respectively.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2009年第2期20-24,共5页
Journal of Ecology and Rural Environment
基金
上海市科委“科技创新行动计划”项目(07dz19601)
关键词
郁闭度
幼龄林
林下草本植物
物种多样性
马褂木
canopy density
young stand
understory herbaceous plant
species diversity
Liriodendron chinense