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引用本文:高伟,程国微,严长安,陈岩.1988-2018年滇池氮磷比的时空演变特征与原因解析.湖泊科学,2021,33(1):64-73. DOI:10.18307/2021.0105
Gao Wei,Cheng Guowei,Yan Chang'an,Chen Yan.Identifying spatiotemporal alteration of nitrogen to phosphorus ratio of Lake Dianchi and its driving forces during 1988-2018. J. Lake Sci.2021,33(1):64-73. DOI:10.18307/2021.0105
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1988-2018年滇池氮磷比的时空演变特征与原因解析
高伟1, 程国微1, 严长安2, 陈岩3
1.云南大学生态与环境学院, 云南省高原山地生态与退化环境修复重点实验室, 昆明 650091;2.昆明市生态环境科学研究院, 昆明市环境系统模拟与风险评估重点实验室, 昆明 650032;3.生态环境部环境规划院, 国家环境保护环境规划与政策模拟重点实验室, 北京 100012
摘要:
氮、磷浓度是制约湖泊营养状态和生产力水平的重要环境因子,而氮磷化学计量比是湖泊生态系统的主要指标,因此,判识氮磷比变化趋势及其驱动力对湖泊生态恢复具有重要意义.研究基于1988—2018年连续观测数据,分析了滇池氮磷浓度和氮磷摩尔比(简称氮磷比)的时空分布演变特征;采用多元线性回归模型分别对滇池草海和外海氮磷比驱动效应进行定量解析,筛选出影响湖体氮磷比变化的潜在驱动因子.结果表明:①1988—2018年滇池氮磷比呈现显著的线性上升趋势,其中草海和外海氮磷比分别上升1.3和0.7 a-1.②草海和外海分别在2008年和2004年发生了氮磷比上升突变,突变前上升归因于总氮浓度快速增加,突变后则是由于总磷浓度下降较快.③滇池的氮磷浓度变化主要是受流域氮磷输入负荷、跨流域调水、流域氮磷削减、风速和水位的综合影响,但受控因子在不同区域可能存在差异.④气温是滇池氮磷比变化的主要驱动因子,流域人为氮磷输入差异是滇池氮磷比变化的次要驱动因子.
关键词:  营养盐  氮磷比  高原湖泊  趋势  突变  驱动力  滇池
DOI:10.18307/2021.0105
分类号:
基金项目:国家自然科学基金项目(41701631)和云南省科技计划项目重点研发计划项目(2018BC002)联合资助.
Identifying spatiotemporal alteration of nitrogen to phosphorus ratio of Lake Dianchi and its driving forces during 1988-2018
Gao Wei1, Cheng Guowei1, Yan Chang'an2, Chen Yan3
1.Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, College of Ecology and Environmental Science, Yunnan University, Kunming 650091, P. R. China;2.Kunming Key Laboratory of Environmental System Simulation and Risk Assessment, Kunming Institute of Eco-Environmental Sciences, Kunming 650032, P. R. China;3.State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation, Chinese Academy of Environmental Planning, Beijing 100012, P. R. China
Abstract:
Nitrogen and phosphorus are two key elements controlling lake eutrophic level and primary productivity. As a substantial stoichiometry indicator of lake ecosystem, identifying change of nitrogen to phosphorus ratio (N/P molar ratio) and its driving forces is fundamental to lake management. Nitrogen and phosphorus concentrations and N/P ratio from 1988 to 2018 were assessed by examining their temporal trend and the time of abrupt change. Controlling factors and their relative contributions to N/P ratio variability were quantified by an established multiple linear regression model. Results show that: linear significantly growing trends of N/P ratios were observed in both Lake Caohai and Lake Waihai over the study period, increasing 1.3 and 0.7 a-1 for Lake Caohai and Lake Waihai, respectively. Abrupt changes of N/P ratios were observed in 2008 for Lake Caohai and 2004 for Lake Waihai. The increasing N/P ratios in both sub lakes were due to the faster increasing rate of total nitrogen (TN) concentration to total phosphorus (TP) before the abrupt point and the slower falling rate of TN concentration to TP after the abrupt point. TN and TP concentrations were influenced by watershed anthropogenic nutrient inputs, trans-boundary water diversion, watershed nutrient mitigation, wind speed and water level with varying impact on Lake Caohai and Lake Waihai. Driving factors varies between concentrations and N/P ratios. Air temperature contributed mostly to the variation of N/P ratios in Lake Dianchi while watershed anthropogenic nutrient inputs and anthropogenic nitrogen inputs act as the second-largest contributors.
Key words:  Nutrients  nitrogen to phosphorus ratio  plateau lakes  trend  abrupt change  driving forces  Lake Dianchi
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