Response of organic phosphorus in lake water to environmental factors: A simulative study

Xiuling Bai; Yunkai Zhou; Wenna Ye; Hongyan Zhao; Jiehua Wang; Wenchao Li

doi:10.1016/j.scitotenv.2021.147275

Response of organic phosphorus in lake water to environmental factors: A simulative study

Sci Total Environ. 2021 Sep 1:785:147275. doi: 10.1016/j.scitotenv.2021.147275. Epub 2021 Apr 23.

Authors

Xiuling Bai¹, Yunkai Zhou², Wenna Ye¹, Hongyan Zhao¹, Jiehua Wang¹, Wenchao Li¹

Affiliations

¹ College of Environment and Planning, Henan University, Kaifeng 475004, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China; National Demonstration Center for Environment and Planning, Henan University, Kaifeng, 475004, China.
² College of Environment and Planning, Henan University, Kaifeng 475004, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China; National Demonstration Center for Environment and Planning, Henan University, Kaifeng, 475004, China. Electronic address: ykzhou@henu.edu.cn.

PMID: 33940417
DOI: 10.1016/j.scitotenv.2021.147275

Abstract

Transformation of organic phosphorus (P) is directly related to a range of environmental factors, therefore exploring their relationships is vital to understanding the biogeochemical cycling of P and its significance in eutrophication of lake waters. In this study, a series of experiments were conducted to simulate the organic P transformation in the water under the influence of dissolved oxygen (DO), temperature and phytoplankton growth. Results showed that the transformation rate of total organic P increased with temperature, ranging from 0.02 to 0.25 mg L^-1 day^-1 at 5 °C, and from 0.04 to 0.72 mg L^-1 day^-1at 30 °C. The transformation rate of total organic P was significantly higher under anaerobic conditions than that under aerobic conditions at 20 °C and 30 °C, indicating that DO is a more important factor for the transformation of total organic P at the high temperature. However, different compounds of organic P responded differently to environmental factors. The change of orthophosphate monoester (Mono-P) content was consistent with that of total organic P when the temperature and DO were the same, but the transformation rates of phosphonate and DNA in the water were less affected by changes of temperature and DO. Additionally, the transformation rate of Mono-P was increased by the growth of phytoplankton when it was used as a P source. Although the relationships between alkaline phosphatase (ALP) activity and organic P are complex, ALP may be the main factor affecting the transformation of organic P at lower temperatures.

Keywords: Dissolved oxygen; Organic phosphorus; Phytoplankton; Temperature; Water.