中文摘要：

结合野外调查及实验室分析对下沙新城区城市化进程中典型生境斑块内野生荠菜种群的数量特征、生殖分配及生活史对策进行研究,旨在揭示伴人植物成功入侵城市斑块生境的机制.研究表明：斑块间种群数量特征发生明显的变异（p〈0.01）,月份间也存在着极显著的差异（p〈0.01）;同一时间水平上种群所处的物候期不一致,生殖分配也有所不同.正是由于这些变化,荠菜这类伴人植物才能成功入侵到城市化的斑块生境中;同时这些变异在一定程度上也反映了城市化过程中的环境变化和人为干扰.

英文摘要：

In order to reveal the successful invasion mechanisms to urban patchy habitats of companion plants during the processes of urbanization,the experiment has researched on the quantitative characteristics,reproductive allocation and life history strategy of Capsella bursapastoris population in typical patchy habitats in new district of Xiasha,Hangzhou,using the methods of field investigation and lab analysis.The results have showed that the quantitative characteristics in different patchy habitats varied significantly（p〈0.01）,and there were significant differences between months（p〈0.01）.In the same time,the phenological phase of Capsella bursapastoris population has showed differently,and accordingly,the reproductive allocation has reflected the differences.Because of these,Capsella bursapastoris and maybe other companion plants can successfully invade the patchy habitats during the urbanization,meanwhile,these variations can also reflect the environmental changes and human activities to some extent during the urbanization.