The Key Environmental Facors of Vegetation Degraded in the Yellow River Delta
Using abundance matrix method of 18 plant species in 41 samples in bulrush wetland of Yellow River Delta for TWINSPAN (Two-way Indicators Species Analysis). We combine the Yellow River Delta ecological effect, use the resnlt of third compartmentalizeion and divide the communities in Yellow River Delta into 7 styles. Through analyzing the correlations between the different environmental factor, show that the soil salt is mainly made up by Na+, Cl-, K+ and Mg2,+. From the result of CCA (Canonical Correspondence Analysis) analysis shows the degradation of Yellow River Delta has two orientations: ① Because of lacking fresh water, xerophytes are abundant, which usually could resist against drought, but could not resist salt. ② Caused by sea-erosion, the plants usually halophyte types, growing in inundation high salt or drought high salt environment. These different condition influence the vegetation distribution, then lead to the degradation of wetland communities. From this paper we can conclude that the key factors causing communities degradation are lack of fresh water and sea-erosion, it also shows that the ecology of wetland needs control the inflow of seawater and bring in fresh water.
TWINSPAN CCA degraded environmental gradient the Yellow River Delta wetland
Zhao Xinsheng Cui Baoshan Yang Zhifeng He Qiang
State Key Joint Laboratory of Environmental Simnlation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China
国际会议
山东东营
英文
121-130
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）