岱海冰封期与非冰封期氮磷分布及影响因素差异分析

侯晨丽; 李洋; 李卫平; 于晟乾; 殷震育; 郭渊; 樊才睿

Spatial and temporal distribution characteristics of nitrogen and phosphorus and analysis of differences with environmental impact factors in Lake Daihai frozen period and no-frozen period

Received:August 06, 2023

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KeyWord:Lake Daihai;nutrient;frozen period;non-frozen period;water environmental factor;freezing exclusion of salts

Author Name	Affiliation	E-mail
HOU Chenli	School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China Collaborative Innovation Center of Autonomous Region for Ecological Protection and Comprehensive Utilization in the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China
LI Yang	School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China Collaborative Innovation Center of Autonomous Region for Ecological Protection and Comprehensive Utilization in the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China
LI Weiping	School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China Collaborative Innovation Center of Autonomous Region for Ecological Protection and Comprehensive Utilization in the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China
YU Shengqian	School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China Collaborative Innovation Center of Autonomous Region for Ecological Protection and Comprehensive Utilization in the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China
YIN Zhenyu	School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China Collaborative Innovation Center of Autonomous Region for Ecological Protection and Comprehensive Utilization in the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China	yinzhenyu1976@163.com
GUO Yuan	Ulanqab City Ecological Environment Bureau Liangcheng County Branch, Ulanqab 013750, China
FAN Cairui	School of Geography Science and Planning, Jining Normal University, Ulanqab 012000, China

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Abstract:

To investigate the nutrient distribution characteristics in Lake Daihai at different periods and the differential response mechanisms to environmental factors, this study used kriging interpolation, correlation analysis, and analysis of significant differences to analyze the spatiotemporal distribution characteristics of nitrogen and phosphorus in Lake Daihai ecosystem and to investigate their response mechanisms to environmental factors in the frozen（January 2021）and non-frozen（May, July, October）periods of the study. The results showed that the trend of total nitrogen（TN）in Lake Daihai was in the order of spring>autumn>summer>winter and the trend of total phosphorus（TP）was in the order of summer>autumn>spring>winter. From winter to the following autumn, the average concentrations of ammonium nitrogen（NH₄⁺-N）and nitrate nitrogen（NO₃^--N）in water decreased and then increased across seasons, whereas TN, dissolved total phosphorus（DTP）, and particulate phosphorus（PP）increased and then decreased, with the highest concentrations in summer, primarily in dissolved phosphorus. In winter, TN concentration exhibited a gradient distribution of high in the lake ′ s center and low in the surrounding areas, while TP concentration was uniformly distributed. Apart from NO₃^--N being most concentrated in the bottom ice layer, TN, TP, and NH₄⁺-N in the ice sample showed the order of surface ice>bottom ice>middle ice. Under the freezing exclusion of salts in the lake, the average separation coefficients of different forms of nitrogen and phosphorus were in the order of NH₄⁺-N>TP>TN>NO₃^--N. DTP showed a significant positive correlation with water temperature throughout the year, decreasing in temperature after entering winter along with reduced external phosphorus supply. During the freezing process, TN was more concentrated than TP, resulting in an increased nitrogen-to-phosphorus ratio in the water beneath the ice. Nutrients response to salinity and chlorophyll-a varied over time, influenced by multiple processes such as ice cover isolation, freezing and salt expulsion, internal and external pollution, and microbial metabolism.