Response of Phytoplankton to Land Use and Water Quality in Bailong River Basin During Wet Season
In this study,Bailong River basin in the Longnan region was selected for research,and we explored the response of the phytoplankton community to land use and water quality.We aimed to provide scientific evidence for protecting water quality and biodiversity in the basin.From June to August 2021(wet season),a phytoplankton and water quality investigation was conducted at 17 sam-pling sites in the Bailong River basin.Correlation analysis,principal component analysis(PCA)and redundancy analysis(RDA)were used to analyze the resulting data and identify key drivers of phyto-plankton community composition and the combined effects of land use and water quality parameters on changes in the phytoplankton community.A total of 73 phytoplankton species from 6 phyla were identified,with dominance by Bacillariophyta(33 species,45.21％)and Chlorophyta(24 species,32.88％).The Shannon-Wiener diversity(H'),Magalef richness(d)and evenness(J')indices of the phytoplankton community were in the respective ranges of 1.82-2.72,4.93-7.46,and 0.67-0.89,with average values of 2.32,6.02 and 0.79.Correlation and principal component analysis showed that the phytoplankton community was primarily affected by water temperature,dissolved oxygen,TN,TP,farmland,built-up land and forest land,and the explanatory power of water quality parameters on phytoplankton community composition was higher than that of land use.Bacillariophyta abundance was positively correlated with water temperature,TN,TP,and the correlation with TP was higher than that with TN.The abundances of Cyanophyta and Chlorophyta were positively correlated with dissolved oxygen,while Cyanophyta abundance was negatively correlated with TN and correlation with TP was not significant.Under the influence of human activities and non-point source pollution,Bacillariophyta and Crytophyta were positively correlated with built-up land and farmland.There was also a significant positive correlation between the area of built-up land,farmland and the concentra-tion of nitrogen and phosphorus.Land use type was the primary variable affecting nitrogen and phos-phorus concentrations in water,and the coupling effect of land use and nutrient concentration jointly affected phytoplankton community composition.
phytoplanktonland useprincipal component analysisredundancy analysisBailong River basin
万方数据
维普
