中文摘要：

调查分析了蓝桉人工林中入侵种群紫茎泽兰的相关生物学指标（密度、高度、生物量）的空间变化.结果显示：（1）紫茎泽兰植株因受蓝桉人工林影响而出现部分死亡.从蓝桉人工林边缘地带至其纵深部位,存活紫茎泽兰植株密度逐渐下降,而死亡紫茎泽兰植株密度逐渐增大.（2）紫茎泽兰植株高度因受蓝桉人工林影响而下降.越向蓝桉人工林纵深部位扩散的紫茎泽兰,其植株（较高、次高、较矮植株）高度越小.（3）紫茎泽兰植株生物量因受蓝桉人工林影响而出现波动.从蓝桉人工林边缘地带向其纵深部位延伸,存活紫茎泽兰植株生物量逐渐下降,而死亡紫茎泽兰植株生物量先缓慢下降后又缓慢上升.预示蓝桉人工林对紫茎泽兰入侵种群扩散具有一定的屏障作用.该研究对紫茎泽兰的预防控制、桉属植物资源的开发利用等均具有重要启示意义.

英文摘要：

In Eucalyptus globulus plantation spatial variation of biological indexes （density, height, and biomass） of invasive Ageratina adenophora population was investigated and analyzed. The results showed ： （ 1 ） A. adenophora plants were affected by E. globulus plantation and part of them died. From the edge to the depth position of E. globulus plantation, density of survived A. adenophora plants decreased gradually while density of dead A. adenophora plants increased gradually. （2） Height of A. adenophora plants declined for being affected by E. globulus plantation. Height of A. adenophora （ Height of the higher, the secondary and the shorter plant） was smaller with A. adenophora spreading to the depth position of E. globulus plantation. （3） Biomass of A. adenophora plant fluctuated for be- ing affected by E. globulus plantation. From the edge to the depth position of E. globulus plantation, biomass of survived A. adenophora plant decreased gradually, while biomass of dead A. adenophora plant firstly decreased gradually and then increased slowly. This study showed that E. globulus planta-tion might have some barrier effect on diffusion of invasive A. adenophora population, have important enlightenment significance for prevention and control of A. adenophora, ment and utilization of plant resources from Eucalyptusspp. which would develop-ment and utilization of plant resources from Eucalyptusspp.