东江河源段浮游植物时空分布特征及其与水质因子的关系OA

To further elucidate the spatiotemporal distribution characteristics of phytoplankton and water environmental factors in the Heyuan Section of the Dongjiang River,6 sampling sites(S1,S2,S3,S4,S5,and S6)were established in this section.Water quality parameters[e.g.,pH,water temperature(WT),dissolved oxygen(DO)]and phytoplankton community characteristics(species composition,abundance,biomass,and diversity)were monitored,and the relationship between phytoplankton and water quality factors was analyzed.The results showed that the water quality indicators of this river section,namely pH,NH3-N,TP and CODMn,meet the Class II standards for surface water environmental quality.However,water quality at sites S6,S5,and S1 was relatively poorer.A total of 301 phytoplankton species were identified,with Chlorophyta,Cyanophyta,and Bacillariophyta being the dominant groups.The abundance and biomass of phytoplankton were higher at the end of summer than at the end of winter.At the cross-section near the sluice gate(S1),phytoplankton abundance and biomass were significantly higher than at other sections.Correlation analysis indicated that pH,DO,and WT were important environmental factors regulating phytoplankton in the Heyuan Section of the Dongjinag River.This study provides a reference for the scientific conservation and management of this river section.