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《Wetland Science》 2009-03
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Relations between Plant Community Characteristic and Soil Physicochemical Factors in Natural Wetlands of Binhai New District,Tianjin

HAO Cui1,LIANG Yao-Yuan1,MENG Wei-Qing2,LI Hong-Yuan1,Ma Chun1(1.Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education of the People's Republic of China,College of Environmental Science and Engineering,Nankai University,Tianjin 300071,P.R.China;2.College of Urban and Environmental Science,Tianjin Normal University,Tianjin 300387,P.R.China)  
In recent years,research on the connection between plant community and soil factors have become the hot pot because of its important ecological significance.Most of the studies focused on mountainous Districts and forests,little has been conducted on wetlands.The wetlands of Binhai New District were studied in this paper because of its unique environmental characteristics.High salt content in the soil and plentifuls are the most important properties of this District.With large-scale development and construction,the natural wetlands of Binhai New District were decreased largely and rapidly,the survival of salt plants has been threatened.The research on salt plant community and local soil physicochemical factors has significant importance for wetland protection and restoration.The wetlands of Binhai New District were divided into four types:coastal wetland,river wetland,lake wetland and constructed wetland.Researches were focused on natural wetlands,especially river and lake wetlands,natural salt plants could hardly be seen in these Districts.Based on the investigation on plant community and soil physicochemical factors of Binhai New District using transects methods between July and September,2008,the relationship between plant community and soil factors in Binhai New District had been researched.Plant collection were adopted by important values,which were measured by 1 m×1 m quadrats.Soil physicochemical factors were measured by titrimetric methods,flame luminosity methods,alkaline hydrolysis diffusion methods,lixiviating methods and heating methods.Canonical Correspondence Analysis(CCA) was applied to draw and analyze the species-environment and samples-environment two-dimensional ordination diagrams.46 families,135 genera,232 species had been investigated,including 61 salt-tolerant species.According to water ecological type,the wetland plants divided into 4 subtypes:aquatic plants,humidogene plants,meso-xerophytism and xerophytism.Soil physicochemical factors could affect the characteristic of plant community in a complicated way in the analysis of the relationship between soil factors and plant community.The sorting among the 23 quadrates demonstrated that the position of different populations had close relations with soil physicochemical factors.Disparities between water content and salt content in the soil implied the most important factors in the formation of vegetation pattern of Binhai New District,available N content showed the second important factor,while pH,orgnic matter,available K and N were not so related with the vegetation pattern.The population positions and characteristic were determined by all these factors.The sorting of dominant species had similar results with quadrates,which proved that the dominant species patterns could decide patterns of population on some extent.
【Fund】: 天津市科技支撑计划重点项目(08ZCGYSF00200)资助
【CateGory Index】: Q948
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