Researches on Typhoon Damage to Mangroves and Preventive Measures

The effects of typhoons on the mangroves was studied in Shenzhen Mangrove Nature Reserve,the results showed that only force 11～12 wind and greater wind could damage the mangrove ecosystem.The damaged rate of typhoons to mangroves like Sonneratia species was up to 80%,heavely influencing the protection function and other effects.The destruction of typhoons to mangroves was correlated to the origin,density,and age of the forest stand:The Sonneratia plantation was destroyed severely by typhoons,while the natural forests were little influenced;The sparse Sonneratia plantations were destroyed by typhoons more seriously than denser plantations;Elder Sonneratia plantations were destroyed by typhoons more seriously than the younger.To improve the ability of mangroves to resist typhoons,some measures in planting mangrove trees were proposed as following:The mangroves should be rational close planted (The planting specification of the Sonneratia is 2 m×2 m.);The plantation belt should be of certain wideness (at least 50～100 m);The first planted seedlings should be fixed to increase their stability;The fast-growing and slow-growing mangrove species should be mixed planted in proper proporations;Fine mangrove species with great resistance to typhoons might be selected as well.