Quantitative Classification and Ordination of Wetland Vegetations in Oxbows,Yangtze River
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Abstract:
The classification and ordination of wetland vegetation in the Tian'ezhou Oxbows of the Yangtze River were studied using two-way indicator species analysis(TWINSPAN) and detrended correspondence analysis(DCA).A total of 234 samples collected from the wetland vegetation in the Tian'ezhou Oxbows were classified into 28 associations by TWINSPAN and the community characteristics of every association were described.The DCA ordination reflected the relationship between plant community type and the environmental gradient.The results showed that soil type and humidity were the main factors influencing the structure and distribution of wetland community.The TWINSPAN classification showed an explicit distribution scope in the DCA ordination plot,which better reflected the relationships between communities and environmental factors when combined with TWINSPAN quantitative classification.Keywords:
Detrended correspondence analysis
Canonical correspondence analysis
Vegetation types
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The classification and ordination of Populus euphratica Oliv.community on the banks of Ejina River in Inner Mongolia were studied by using the two-way indicator species analysis(TWINSPAN)and distended canonical correspondence analysis(DCA).Eight quadrats selected from the community were classified into four associations by TWINSPAN,and ecological environment of each association was discribed.The results of DCCA ordination were tested and verified by the results of TWINSPAN.The ordinate and abscissa of DCCA ordination indicates the gradi- ent variations of ground water level,air relative humidity,and soil humidity to elevation of each association.Fur- thermore,the results of DCCA ordination and environment factor correlation analysis showed that the ground water was the crucial environment factor among the all to the distribution of plant community.
Quadrat
Canonical correspondence analysis
Detrended correspondence analysis
Elevation (ballistics)
Populus euphratica
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The classification and ordination of the grassland vegetation in flood plain of the Fen river in Taiyuan were studied using two?way indicator species analysis(TWINSPAN) and detrended correspondence analysis(DCA). Sixty samples collected from in flood plain of the Fen river were classified into 17 associations by TWINSPAN. The community characteristics of every association were described. The result of DCA ordination indicated that there were obvious relationships between the distribution pattern of associations and soil water content, soil texture, artificial perturbation. Furthermore, the analysis of DCA proved the continuous change of vegetation and the environmental variation. DCA ordination of species showed that species acted as indicator for habitat factors and was impersonally reflected characteristics of biotope. Moreover, the dynamic succession tendency of the grassland vegetation in flood plain of the Fen river are discussed.
Detrended correspondence analysis
Canonical correspondence analysis
Gradient analysis
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Detrended correspondence analysis
Canonical correspondence analysis
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By using the combination of TWINSPAN and DCA,this paper classifies and ranks the plants in Zhangze Reservoir’s Wetland of Changzhi City into 8 associations that are located at different areas according to the moistures.The results of the classification and ordination reflect well the relationship between the types of plant associations and the environmental factors which are verified well in the two-dimension ordination diagram by DCA.The ordination axes of DCA reflect the gradient change of soil moisture,which shows that water condition is the main ecological factor that influences the plant association.
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Based on the field investigation,two-way indicator species analysis(TWINSPAN) and distended correspondence analysis(DCA) were applied to analysis on the artificial vegetation in sandy hill areas of northwest Shanxi.87 samples with 109 plant species were classified by TWINSPAN into 11 associations that were located at different altitudes.The characteristics of each association were described.The results of DCA ordination were consistent with TWINSPAN classification,and indicated that the altitude,slope and soil moisture were the dominant ecological factors responsible for the flora distribution in the research areas.
Detrended correspondence analysis
Canonical correspondence analysis
Flora
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Through field investigation,two-way indicator species analysis(TWINSPAN) and distended correspondence analysis(DCA) were adopted to conduct weed community classification and ordination in orchard in autumn in Institute of Pomology,Shanxi Academy of Agricultural Sciences.According to the results of TWINSPAN and in combination with the ecological characteristics of the region,69 quadrats were divided into 12 associations,and their community characteristics were described.The result of TWINSPAN reflects the relation between weed community types and environment gradient and was tested and verified in DCA.DCA ordination indicated the distribution pattern of weed community was closely related to soil nutrient,soil water and elevation.The results indicated weed community had indicating function to habitat that could objectively reflect the characteristics of habitat.
Quadrat
Detrended correspondence analysis
Orchard
Canonical correspondence analysis
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Danjiangkou Reservoir is the water supplying area of the Middle-Route of South-to-North Water Transfers Project.To serve that purpose,the existing Danjiangkou Dam will be elevated to the level of 176.6 m(above sea level) from 162 m,and the normal pool level will be 170 m instead of the present 157 m.Thus,analysis for the composition and distribution of existing vegetation in Danjiangkou Reservoir Region will provide data for wetland management and water environment maintenance of the future.The present paper detected the distribution patterns and species composition of the wetland vegetations using TWINSPAN and DCA in the Danjiangkou Reservoir Region.TWINSPAN classification divided the vegetation into 14 associations,and their community characteristics were described.DCA ordination of samples revealed that soil type and humidity were the main factors influencing the structure and distribution of wetland community.The current floodplain vegetation in Danjiangkou Reservoir was dominated by Cy-nodon dactylon,Rumex maritimus,Mazus gracili and Echinochloa crusgalli.
Canonical correspondence analysis
Vegetation types
Indicator species
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Classification and ordination of the plant community from the mouth of Fen River to the Yellow River were studied using field plots,and two-way indicator species analysis(TWINSPAN) and detrended correspondence analysis(DCA).A total of 78 samples were divided into 18 associations by TWINSPAN and their community characteristics are described below.The results of DCA ordination reflected the relationship between plant community type and the environment gradient and showed that the distribution patterns of the associations were mainly affected by the water gradient of the soil.
Detrended correspondence analysis
Gradient analysis
Canonical correspondence analysis
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Detrended correspondence analysis
Shrubland
Diversity index
Three gorges
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According to the data of a community survey in field plots,classification and ordination of the communities of the conservation plant Fagopyrum cymosum(Trev.) Meisn in eastern Chongqing were made using the two-way indicator species analysis(TWINSPAN) and detrended correspondence analysis(DCA).One hundred and sixteen samples were divided into 14 groups by TWINSPAN,which were classified into 14 associations based on the principle of vegetation classification,and their characteristics are described in this paper.The result revealed the relationship between plant community type and environment gradient,which was confirmed in the chart of DCA.The ordination of DCA,which reflects the gradient change of illumination and elevation,suggested that illumination and elevation are the main limiting factors which determine the composition and spatial distribution of the community.
Detrended correspondence analysis
Gradient analysis
Limiting
Elevation (ballistics)
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