【摘要】 桉树林下植被有灌木一草本型和纯草本型2种类型，共有植物种类18种，出现最多的样地仅11种。灌木一草本型植被分布于离地面150cm范围，纯草本型植被分布于离地面40cm范围。随林龄增大，林下植被物种丰富度降低，多样性下降，生物量减少。造林密度增加，物种丰富度降低，多样性下降。随这栽代次增加，林下植被生物量和物种多样性下降，但不能成为林分生产力下降的理由。轮作西瓜可增加林下植被生物量和物种多样性，这对桉树林下植被的恢复与重建提供了可能性。更多还原

【Abstract】 There were two patterns of understorey vegetation in Eucalyptus plantations:shrub/herb and pure herb, and a total of 18 species of Plants were found underthe plantstions. As many as 11 species of the undergrowth were found in one sample plot. The shrub/herb vegetation was distributed within 150 cm from the groundand pure herb vegetation within 40 cm. The abundance and diversity of the speciesof the undergrowth decreased with the age and stand density. The biomass of theundergrowth decreased with the age. The biomass and species diversity of the undergrowth decreased with continuous rotation, which was, however, not considered as acause to low stand productivity. Rotation by watermelon increased the biomass andspecies diversity of the undergrowth, indicating some possibility of restoration and reestablishment of understorey vegetation.更多还原