Ecological Study on the Small Mangrove Communities Established by Partial Artificial Method——The Suitability of the Entire Environment of Shrub Community to the Arbor Populations and the Strategy on Community Rehabilitat

By means of the composite indexes of population survival and growth, and by using arbor populations introduced into a secondary Aegiceras corniculatum+Ceriops tagal shrub community thinned in a certain extent as a contrast and those introduced directly as the main objects of the study in Dongzhai National Mangrove Reserve, Hianan Province, the paper conducted the comparison and analysis on the suitability of the entire environment of the shrub community (not thinned) to the arbor populations;and by the theory and method of gray strategic decision, the better arbor species and method for rehabilitating the secondary A.corniculatum+C.tagal shrub communities existing commonly in south China were determined from the overall considerations on the dominance of the arbor populations and a good community appearance, to bring the effect of preventing wind and controlling wave as soon as possible, the reasonable proportion between arbors and shrubs and utmost productivity, rational arbor population structure, the sustainable regeneration of the rehabilitated community and long term ecological effect.The results showed that the suitability of the entire environment of the shrub community to the arbor populations was as the following: Rhizophora stylosaBruguiera gymnorrhizaB.sexangula;and that the method of introducing arbors into the shrub community thinned in square way can increase their survival rate and growth compared with that of introducing the arbors directly;and the arbor species to be used in rehabilitating the secondary A.corniculatum+C.tagal shrub community by the method of introducing directly can be queued in order as the following in terms of what was good and what was bad: Rhizophora stylosa→R.apiculata→B.gymnorrhiza→B.sexangula.