Primary Productivity and Restricted Nutrients in Huanren Reservoir, Liaoning Province
YUAN Junjie1, ZHAO Wen1, WANG Anpu2, LIU Gang1, WEI Jie1, PANG Yujia1, WANG Zhe1, WANG Shengyun2
1.Key Laboratory of Hydrobiology in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China; 2.Liaoning Zhenghan Fisheries Groups Co, Ltd, Huanren 117200, China
Abstract：The restricted nutrients and physical and chemical indicators of water were determined in situ in water samples collected at three sampling sites in the upstream (Jiangnanjiudui), middle (Lalagangzi) and downstream (Sihedadi) of Huanren Reservoir, Liaoning Province, on April 10, June 11, and August 14, 2018 to understand the nitrogen and phosphorus distribution, nutrient limitation and primary productivity of Huanren Reservoir in Liaoning, and to protect the structure and functional integrity of ecosystem in Huanren Reservoir. Significant increase in dissolved oxygen levels in water was observed at 0.5 mg/mL of nitrogen and 0.3 mg/mL of phosphorus, and N/P value of 2∶1, and N/P value of 4∶1 in downstream was in upstream and middle reaches in nutrient enrichment experiment (P<0.05). It was found that the primary productivity was changed significantly with season, with the lower original P/R coefficient than that in experimental group.It is concluded that nutrient limiting factors in Huanren Reservoir are significantly affected by seasonal variation, with dual restrictions such as nitrogen and phosphorus. According to primary productivity, Huanren Reservoir is a self nourishment metabolic water body.
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2020, Vol. 39 
