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This study on the basis of a comprehensive analysis of the situation in the ecological restoration of mangrove specific difficulties in Xiamen mangrove ecosystems recovery process from the perspective of tide, sediment, pest specific analysis of the difficulties faced Xiamen mangrove ecological restoration . Seize the key factors affecting mangrove plant seedlings survived: the shoals tide level is too low, survival, growth, photosynthesis, nutrient accumulation of secondary metabolites of the relationship between the the shoals elevation and mangrove plant seedlings growth; compared different cropping patterns (with tree species, planting density) and other effects of ecological restoration; explore the ecological function of the change in the mangrove ecosystem in the recovery process. 1 TFE ecological restoration of mangrove clear from the theory and practice of TFE is to determine the key to the success or failure of mangrove afforestation. 7 elevation transects in Xiang'an plots shoals set, different elevation Xiamen mangrove afforestation of native species candel. Candel forest survival rate, height, crown width and Yu shield degrees, as well as forest annual net biomass significant relationship with elevation. Clearly raised of the the Xiamen Xiang'an mangrove growth shoals elevation. The results show that: candel barren mudflat elevation to the elevation of more than 1.0 m in the Yellow Sea. With increasing elevation candel seedlings photosynthetic electron transport rate, maximum photosynthetic efficiency potential (Fv / Fm) showing a trend of increased non-photochemical quenching coefficient indicates (NPQ) decreased gradually. When the elevation lower than 0.6 m, candel seedlings photosynthetic efficiency is low, severely damaged light flooding seriously affected candel seedlings photosynthesis. Elevation higher than 0.6 m candel seedlings photosynthetic activity not been much affected photosynthesis normal. Measured shoals the elevation under 1 year old candel seedling leaf tannins, C, N, chlorophyll content, Waterlogging on the effect and mechanism of candel seedlings of secondary metabolites tannins. The results show that, with the reduction of the marsh surface elevation, the decline in photosynthetic capacity, by assimilation suppression, C / N and tannin content decreased candel seedlings leaves the content of C, N and tannin content of waterlogging stress response in line with carbon / nutrient balance hypothesis. 4 compares the different planting mode and with the effects of ecological restoration planting. First, the control by the close planting of mangrove mudflats thinning, 1 years old candel seedlings set four kinds of density: (1) 20 cm x 20 cm; (2) 30 cm x 30 cm; (3) 50 cm x 50 cm; (4) 100 cm × 100 cm, and three with planting: (I) candel Chunlin; (2) apetala Chunlin; (3) candel, apetala stylosa mixed species forest. Experimental results show that: the thinning density of 50 cm × 50 cm, best candel growth conducive to the rapid transformation of the arboreal community, and candel, apetala the stylosa hybrids forest grow best, help to improve seedling survival rate and recovery effects. 5. Mangrove ecosystem recovery process in a given area, the biological factors barnacles attached to the normal growth of K. candel seedlings, and comparative study of the hazards of artificial mangrove seedlings of different mangrove area Naito pot reveals barnacle attachment and distribution of mangrove areas in the number of plots elevation, ocean salinity and tidal speed close relationship. The research results show that the inundations depth, the salinity, smooth flow shoals barnacles serious harm, the mangrove seedlings lodging or mortality significantly increased.
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