| The Kandelia candel in east part of Fujian provience(Fuding),which locate in the northernmost part of china,plays an important role in the mangrove study. The structure characteristics,life table,species spatial distribution,biomass,carbon stock,calorie value etc.of the Kandelia candel were studied in this paper,the results showed that:(1)Height structure indicated that there was variation existed in different origin plantation and natural forest .The height of individual of natural forest distributed at the range of 0～0.5m,which of plantation scattered in 1.5～2m.The difference of diameter structure in different origin plantation and natural forest were obvious. The diameter structure was focused on 0～2cm.When the diameter structure grew,the number of individual dropped.For short of 0～2cm,the plantation assumed highly basically being scattered very much.(2)The Kandelia candel had two deaths peak during its development and succession,that is one in the stage of seedings into young seedings,and the other of adult stage. The most of Kandelia candel died at the age ofⅧ.The survival curve of population trended to typical type of deevey-Ⅲ.The population survives drop fast in the earlier stage.In the later stage,the survivals did not fluctuate largely.(3)The concerntration class index,Iwao M*- x and Taylor principle were used to research spatial distribution pattern of the Kandelia candel populations at different origin plantation and natural forest in Fuding.With the development of the population of seedlings,young tree,adult tree to old tree,the population distribution pattern changed as followed:(1)natural Kandelia Candel populations: contagious pattern→random pattern→random pattern→random pattern; ( 2 ) plantion: 0→uniform distribution→contagious pattern.Natural regeneration and dispersal of artificial Kandelia candel population had more or less occured,which may increase the structure complexity and stability of the artificial population.(4)The total biomass of the natural Kandelia candel forest were 58.305t? hm-2with the aboveground for 32.919t? hm-2and underground part for 25.386t? hm-2;the total biomass of plantation were 25.359 t? hm-2,among which the aboveground part were14.711 t? hm-2and underground part were 10.648t? hm-2respectively.Using the biomass data of of fowers,leaves,stems,twigs,trunk,the biomass allocation were as follows:twigs>stems>macroroots>leaves>mid roots>trunk>micro roots>flowers.(5)The carbon stock of the Kandelia candel forest ecosystem were mainly consisted three sections,which were the trees,the litter and soil.The order of those carbon stock could be ranked as followed:the soil> the trees> the litter.The carbon stock of the natural Kandelia candel were 221.505t? hm-2,with the aboveground for 28.732t? hm-2and the underground part for 192.782t? hm2;carbon stock of the Kandelia candel plantation ecosystem were154.739t?hm-2,among which the aboveground part were 10.271t?hm-2and underground part were 144.468t? hm-2respectively.(6)The calorie values in various component of the Kandelia candel can be ranked in the decreasing order as follows:leaves>flower>twigs>stems>trunk>macroroots>mid roots>micro roots,for plantation,the order isleaves>stems>twigs>trunk>flower>macro roots>micro roots>mid roots.The calorie values of natural various plant parts rang from12kJ/g～18kJ/g for gross calorie values.The same highest value is leaves,above 17kJ/g,and the lowest one is root,under 13kJ/g.The calorie values increased as the trees growed. The calorie values also varied with latitude of the areas,genenrally.The gross calorie value were the higher in lower latitude.
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