The Quantity Characteristics And Degradation Mechanism Of Mangrove In FuJian Zhangjiangkou

Fujian Zhangjiangkou mangrove reserve has been concerned aroused by many scholars,with the sharp decline of mangrove populations by the crisis of mangrove system,the protection has became a pressing task.According to the Fujian Zhangjiangkou geographic features,visiting the community on the basis of comprehensive,soil conditions and matrix-oriented factors,beaching along the river direction,the sample of the community was,Kandelia candel population, Aegiceras corniculatum community,Aegiceras corniculatum + Avicennia marina community,and Avicennia marina community.Plots methods used for field surveys and analysis community characteristics of environmental factors on mangrove species diversity.And use of multi-species model anthropogenic interference with competition under mangrove species proportion of the trend for sustainable management of mangrove forests,and provide a scientific basis for the protection of great theoretical and practical significance.Main results as follows:(1)Based on the important value indicators,four kinds of indicators gathered in Fujian Community Zhangjiangkou lipstick tree species composition,type,structure,and distribution pattern of conduct,the result was 1)Zhangjiangkou mangrove nature reserve component dominant mangrove species was Aegiceras corniculatum,Kandelia candel,Avicennia marina,which was the main advantage of Aegiceras corniculatum species;2)the principal types of communities Aegiceras corniculatum community,Avicennia marina community and Aegiceras corniculatum-Avicennia marina community,and other three formations;3)Community structure is relatively simple,mostly shrubs;4)Kandelia candel,Aegiceras corniculatum,Avicennia marina populations showed cluster distribution.(2)Using four kinds of quantitative indicators of Fujian Zhangjiangkou mangrove communities species diversity,Aegiceras corniculatum+Avicennia marina community in the highest species diversity index,resulting in mangrove Zhangjiangkou community the reasons for the differences in species diversity is the type of community composition,structure and the different habitat conditions.(3)Using three kinds of niche bread formula and three kinds of Niche overlap measurement formula to study the niche breadth and overlap of mangrove communities in Zhangjiangkou,the results showed that:1)Niche bread rank was Kandelia candel＞Aegiceras corniculatum＞Avicennia marina＞Bruguiera conjugate, Kandelia candel population's niche bread was the largest,it indicated that the Kandelia candel using of resources was the fullest and the ability of using resources was most capable;2)The niche overlap of Kandelia candel and Avicennia marina were the highest value,Kandelia candel and Avicennia marina were quite competitive in the same place,them had the similar capacity on using the resourses,but the niche overlap between Avicennia marina and Bruguiera conjugate were no exist,it indicated that Avicennia marina and Bruguiera conjugate adaptting to the environment in different ways.(4)Environmental factors in forming patterns of biological diversity is the role of people one of the issues of common concern,like using sampling methods to study various environmental factors and mangrove Zhangjiangkou diversity relations.Habitat factor analysis of the correlation between that,salinity and organic matter were significantly correlated,and Cr,pH was significantly positively correlated,and the remaining correlation is not significant.Principal component analysis that affect Zhangjiangkou mangrove communities spatial pattern of the integrated factor of organic matter,Cu ion content and salinity,the important rank was organic＞Cu ion content＞salinity.Diversity and habitat factor analysis showed that the most important factor affecting diversity was organic matter,and the influence of the dominant species is the chance encounter Cu ion content.The two major factors impactting mangrove species diversity were organic matter and Cu ion content.Kandelia candel niche width and environmental factors had no significant correlation,and the lower correlation coefficient,the environmental factors on the Kandelia candel niche width less affected,Avicennia marina niche width and environmental factors lower correlation coefficient,and environmental factors in a pH value significant negative correlation(-0.70),showed that pH is affected Avicennia marina niche width of the main factors, Aegiceras corniculatum niche width and salinity were significantly correlated,but not the correlation coefficient(0.68),and organic matter was very significant positive related,and the greater the correlation coefficient(0.93),indicating that Aegiceras corniculatum niche width greater impact on the environment,especially the organic matter and salinity,and that Aegiceras corniculatum grows more dependent on environmental conditions.(5)Research on human activities,and the destruction of wetlands and wetland species diversity has become the impact of the current wetland biodiversity conservation of the important content,the use of multi-species Tilman competitive model under the conditions of human interference Zhangjiangkou mangrove species abundance changes likely trends,the results show that with the habitat area Kandelia candel reduce the number of sharp decline,but with the habitat area increased,the number has increased.the main growth area is the limiting factor.With habitat loss Aegiceras corniculatum sharp decline in the number of trees,but with the increase in habitat area,Aegiceras corniculatum volume has increased,and faster to achieve a stable state and that Aegiceras corniculatum growing their own growth characteristics and environmental conditions common role Results.With habitat reduction sharp decline in the number of Avicennia marina, after a stage adaptation,habitat increase,the number was still less Avicennia marina and the longer time required to achieve a stable state and that growth is Avicennia marina own growth characteristics and environmental conditions common role Results.With the number of wood rugby reduced habitat area decreased,but the wood is still the dominant species rugby,rugby describes the wood species become rare human deforestation is the main reason..(6)With the development of economy and the constant interference of human activities,the area of mangrove forests gradually reduced,in order to protect mangroves,mangroves play better ecological benefits,social benefits and economic benefits to achieve the sustainable development of mangrove forests,red Sustainable forest management is the most effective way,and indicators of sustainable management system is the establishment of sustainable management of mangrove on the premise.According goals combined with expert advice and build up a set of four levels from 21 specific indicators of the composition of mangrove forests along the coast of Fujian Sustainable Management index system,the adoption of the system of Fujian Zhangjiangkou mangrove nature reserve evaluation of the operation of the status,Sustainable Management comprehensive for evaluation index 0.797 the overall operation of the weak sustainable.(7)Integrated mangrove community characteristics,human interference,the sustainable management of the main conclusions from the evaluation of resource protection and development of the two proposed mangrove Zhangjiangkou sustainable management proposals.