Preliminary Report on Introduction of Several Superior Mangroves

Superior and fast growing mangrove species Bruguiera sexangula, Sonneratia caseolaris, Rhizophora apiculata, etc.were introduced to Shenzhen Bay and North Bay mangrove zones (21°30′～22°32′ N,109° 41′～114°03′ E) in Guangdong Province of China from Dongzhai Harbor of Hainan Island (19°56′ N,110°34′ E) since 1993 and the results showed:mangrove B.sexangula grows and develops well in these mangrove zones with medium to increasingly strong cold resistant ability from seedling period to young trees of 3-year-old. The mean height of 1-year-old seedlings is 0.5 m,3 year old ones 0.71 m and the height of the superior individual is up to 1.5 m. Its propagules can exist about 3～6 days under 5 ℃ condition,otherwise too long in time and too low in temperature is not suitable to them. The cold resistance of mangrove S.caseolaris is slightly weak but in specific warm habitat it can also pass the cold winter smoothly without any cold harm and grows well. The mean height of 2 year old young trees is 2.30 m,the mean diameter at ground 4.8 cm and the height of the superior individual up to 3.00 m,the diameter at ground 7.7 cm. Of which six individuals are in blossom at Shenzhen Bay mangrove zone. R.apiculata does not adapt to above mentioned introducing zones with high latitude and low temperature.