The analysis on the reason of hermatypic coral degradation in Xisha
The analysis on the reason of hermatypic coral degradation in Xisha
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发表时间：
2011
影响因子：
1.4
通讯作者：
Zhang Guang-xing
中科院分区：
文献类型：
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作者：
Zhang Guang-xing
2005-2009年对永兴岛、石岛、西沙洲、招树岛、北岛5个站的造礁珊瑚种类、覆盖度、补充情况及主要环境因子进行了调查。结果表明，西沙生态监测区造礁珊瑚逐年退化，活造礁珊瑚覆盖度由2005年的65%下降到2005年的7.93%。 2009年，死珊瑚覆盖率从2005年的4.70%增加到2009年的72.90%，新珊瑚补充量也越来越少。2005年新珊瑚补充量为1.21 ind/m3，2009年仅为0.07 ind/m3。进一步分析表明，西沙生态监测区造血型珊瑚衰退的原因有很多，如生物侵蚀、海水变暖、海洋酸化和过度捕捞等，而食珊瑚棘冠海星(Acanthaster planci)的爆发是造成西沙生态监测区造血型珊瑚数量减少的主要原因。
Species,coverage and recruitment of hermatypic coral and mainly-related environmental factors were investigated at five stations(Yongxing Island,Shidao Island,Xishazhou,Zhaoshu Island and North Island) during 2005-2009.The results show that hermatypic coral has been degraded year by year in Xisha ecological monitoring area.The live hermatypic coral coverage decreases from 65% in 2005 to 7.93% in 2009.In contrast,the dead coral coverage increases from 4.70% in 2005 to 72.90% in 2009.A new coral recruitment also becomes less and less.In 2005 the new coral recruitment is 1.21 ind/m3 but only 0.07 ind/m3 in 2009.Further analysis indicates that the hermatypic coral declines for many reasons in Xisha ecological monitoring area,such as bioerosion,warm water,ocean acidification and overfishing,etc,while outbreaks of the coral-eating crown-of-thorns starfish(Acanthaster planci)are the main reason which causes the hermatypic coral to decline in Xisha ecological monitoring area.