不同更新方式对常绿落叶阔叶混交林物种多样性的影响

作者就木林子自然保护区常绿落叶阔叶混交林4种更新方式对物种多样性的影响进行研究。结果表明:从人工柳杉林、人工杉檫混交林、人促更新林到天然更新林,多样性指数(SW)和均匀度指数(Jsw)逐渐增加,生态优势度指数(D)逐渐降低;随着高度级增加,各更新样地物种多样性指数(SW)表现出波动性下降趋势,生态优势度(D)呈波动性上升趋势,均匀度指数(Jsw)变幅不大;随着径级的增加,人工柳杉林多样性指数(SW)无明显变化,其他样地多样性指数(SW)逐渐减少,各更新样地生态优势度指数(D)逐渐增加,均匀度指数(Jsw)变幅不大。

Influence of Different Regeneration Modes on Species Diversity of Mixed Evergreen and Deciduous Broadleaved Forest

Influence of four regeneration modes on species diversity of mixed evergreen and deciduous broadleaved forest was studied.The results showed that the diversity indices and evenness indices increased gradually in Cryptomeria fortunei Hooibrenk plantation,the mixed plantation of Cunninghamia lanceolata (Lamb.) Hook. and Sassafras stumu (Hemsl.) Hemsl.,artificial regenerative forest and natural regenerative forest,the dominance index was in adverse. Along with level of tree height,the diversity indices in all decreased,the dominance index increased and evenness indices was lower in center and higher in edges . Along with level of DBH,the diversity indices of Cryptomeria fortunei Hooibrenk plantation was almost changeless and decreased gradually in other stands,the dominance indices in all increased gradually and evenness indices was changeless at the same time.