中文摘要：

选取深圳湾红树林的林缘、林窗及郁闭海桑Sonneratia caseolaris林和秋茄Kandelia obovata林等4种环境下自然生长的海桑幼苗，测其生物量、光合特性等指标。结果表明，林缘海桑幼苗生物量累积最大，叶片生物量所占比重最高，幼苗通过提高叶片面积和叶片数量，增加光合速率、水分利用率和光合氮利用率而加速生长。综合分析4种环境的环境因子发现，光照强度是决定幼苗速生并占领生态位的关键生态因子。该结果为研究深圳湾外来种海桑的危害及其防控和管理措施提供参考。

英文摘要：

This study aimed to discover the growth, photosynthetic traits of Sonneratia caseolaris seedlings to different environment in natural mangroves, which were four kinds of plots under dense canopy of Kandelia obovata forests and S. caseolaris forests, forest gaps, and mudflats. The results showed that the seedlings growing in mudflats had the largest total biomass and leaf biomass partitioning, attributing to their high photosynthetic rates, water use efficiency and photosynthetic nitrogen use efficiency. Light intensity was the key factor among the all environmental factors that contributing to the fast growing of S. caseolaris seedlings, which led to its competition for new habitats. The results provided a reference for the management of non-native species, and the control of its invasive potential in Shenzhen Bay.