Abstract
On the basis of the “Environmental quality standard for surface water” (GB 3838-2002) in China, eight water quality indexes were measured in M River, including pH, water temperature (T), transparency (SD), dissolved oxygen (DO), chemical needs Oxygen (COD), ammonia nitrogen (NH3-N), total nitrogen (TN), total phosphorus (TP). Using the single factor index method, it is concluded that the water pollution of M River is serious and the water quality is beyond Grade V of water environment standard. Moreover some indexes of the water quality meet with the standard level, including COD, NH3-N, TN and TP. The Pearson correlation analysis is conducted between water quality indexes and phytoplankton community parameters. After phytoplankton qualitative and quantitative analysis, the phytoplankton community characteristics in Minxin River were analyzed by Dominance index (Y), Shannon-Wiener diversity index (H’), Margalef Species diversity index (d) and Pielou evenness index (J). H’ and TN was a significant positive correlation (r = 0.923, P <0.05); J and COD was a significant positive correlation (r = 0.918, P <0.05); There was a very significant negative correlation between d and water temperature (T), COD, NH3-N, TN (r =-0.881, P <0.01; r =-0.983, P <0.01; r =-0.893, P <0.01; r=-0.962, P<0.01). The result of the research indicates that T, COD, NH3-N and TN are main water quality indexes affecting phytoplankton community structure.
Highlights
At present, most physical and chemical indexes and biological indexes are used to evaluate surface water quality at home and abroad
S3 and S4 is close to the public, there are domestic waste and sewage discharged into the M River
Some indexes of the water quality are beyond the standard level, including COD, NH3-N, total nitrogen (TN) and total phosphorus (TP)
Summary
Most physical and chemical indexes and biological indexes are used to evaluate surface water quality at home and abroad. To understand the phytoplankton community structure and the water quality state in Huaihe River Basin, phytoplankton samples were collected in the basin in May 2013, the result showed that the phytoplankton diversity index was low and most sites were in a medium-heavy pollution state (Zhu Weiju et al, 2017). There is little research on water quality evaluation for the M River. The phytoplankton community constitute and water quality evaluation in M River were carried out in December 2019. Results of phytoplankton composition together with water quality parameters are reported, which provided the basic data for the ecological environment management
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