中文摘要：

沉积挖出并且倾倒引起的一个高沉积事件在 Yulin 海湾在 Xiaodonghai 礁石上被记录，南部的海南岛，中国。显著地高的沉积和经常的轻 shading 在倾倒事件(SD 事件) 的沉积期间被观察。用长期的录像横断，我们确定了在 2008 和 2010 之间的 SD 事件的珊瑚社区变化和回答。SD 事件在 6 m 的深度在 Xiaodonghai 礁石上引起了严重珊瑚死亡，当在 3 m 的珊瑚少些被影响时。在 6 m 的全部的实时珊瑚盖子从 54.3% ～ 14.8% 减少了，并且 Diploastrea heliopora 在 6 和 9 m 作为主导的珊瑚种类代替了 Galaxea fascicularis。少年珊瑚的密度也在 SD 事件以后衰退了，特别为类 Galaxea 和 Platygyra。然而，少年 Porites 和 Pocillopora spp 的密度。稍微增加了。在 SD 事件以后监视 11 个月没在 Xiaodonghai 礁石上显示珊瑚社区的恢复。当在 Yulin 海湾的主导的珊瑚变了到更多的容忍的珊瑚种类时，长期的录像横断数据也在 2010 在 2008 ～ 9% 表明那个吝啬的实时珊瑚封面戏剧性地衰退了，从 30.5% ，例如巨大的 Porites spp。并且 D。heliopora。在在 2008 和 2010 之间的 Yulin 海湾的快速的珊瑚社区降级被高沉积免职源于集中的挖出和陆地空地活动可能引起。这些结果加亮必要性让一个综合分水岭管理在近岸的珊瑚礁石上控制沉积免职。

英文摘要：

A high sedimentation event caused by dredging and dumping of sediment was recorded on Xiaodonghai Reef in Yulin Bay, southern Hainan Island, China, Significantly high sedimentation and constant light shading were observed during the sediment dumping event （SD Event）. Using long-term video transects, we quantified coral community changes and responses to the SD Event between 2008 and 2010. The SD Event caused severe coral mortality on Xiaodonghai Reef at a depth of 6 m, while corals at 3 m were less affected. Total live coral cover at 6 m decreased from 54.3% to 14.8%, and Diploastrea heliopora replaced Galaxea fascicularis as the dominant coral species at 6 and 9 m, The density of juvenile corals also declined after the SD Event, especially for the genera Galaxea and Platygyra. However, the density of juvenile Porites and Pocillopora spp. slightly increased. Monitoring for 11 months after the SD Event indicated no recovery of coral communities on Xiaodonghai Reef. Long-term video transect data also revealed that mean live coral cover dramatically declined, from 30.5% in 2008 to 9% in 2010, while the dominant corals in Yulin Bay shifted to more tolerant coral species, such as massive Porites spp. and D, heliopora. The rapid coral community degradation in Yulin Bay between 2008 and 2010 was probably caused by high sediment deposition resulting from intensive dredging and land-clearing activities. These results highlight the necessity for an integrated watershed management to control sediment deposition on near-shore coral reefs.