巢湖水体中磷的季节性波动及其驱动因素  

Seasonal patterns of phosphorus in Lake Chaohu and its influencing factors

作　　者：张民[1,2,3] 高芮 阳振 史小丽[1,2,3] 陈开宁[1,2] 尹洪斌 王丽雅[1,2,3] 孟洋洋[1,2,3] Zhang Min;Gao Rui;Yang Zhen;Shi Xiaoli;Chen Kaining;Yin Hongbin;Wang Liya;Meng Yangyang(Key Laboratory of Lake and Watershed Science for Water Security,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China;Nanjing School,University of Chinese Academy of Sciences,Nanjing 211135,P.R.China;Institute of Lake Ecology and Environment,Chaohu Lake Bureau of Anhui Province,Hefei 230601,P.R.China)

机构地区：[1]中国科学院南京地理与湖泊研究所,湖泊与流域水安全重点实验室,南京210008 [2]中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,南京210008 [3]中国科学院大学南京学院,南京211135 [4]安徽省巢湖管理局湖泊生态环境研究院,合肥230601

出　　处：《湖泊科学》2024年第6期1650-1659,共10页Journal of Lake Sciences

基　　金：江苏省科技计划项目(BK20220018);巢湖生物资源调查及生态修复示范工程项目(2020-340181-77-01-037328);国家自然科学基金项目(32170546)联合资助。

摘　　要：浅水湖泊中磷的季节性波动是湖泊生态系统响应环境变化的重要过程,揭示湖泊中磷的季节性波动过程及其影响因素是科学和有效实施湖泊管控的关键。本研究利用巢湖2012-2023年的连续逐月监测数据,分析巢湖水体中磷的季节性变化规律及其驱动因素。结果表明:巢湖水体中磷呈现明显的年内波动模式,其中2-4月份是一年水体中磷的低值时段,而后逐渐升高,8-10月份达到年度水体中磷的高值时段,高值时段总磷浓度比低值时段平均高0.058 mg/L,平均增加84%,而且这个波动幅度从东到西逐步升高。浮游植物生物量和叶绿素a的年内变动模式与水体中磷的波动模式并不匹配,其中浮游植物生物量的年内峰值较磷的年内峰值出现更早,而冬季仍是浮游植物生物量和叶绿素a浓度较高时段,水体中磷的浓度却相对较低,藻类年内波动幅度对磷的波动幅度解释率不足10%,表明巢湖水体中磷的季节性波动受浮游植物的年内变化影响有限。巢湖水体中磷的年内波动模式可能主要受内源磷的自然释放过程驱动,藻类的泵吸作用和外源污染入湖的调节作用并不明显。本研究提升了对浅水湖泊中磷季节性变化规律的认识,对湖泊内源污染的管控策略制定具有重要的科学意义。The seasonal fluctuation of phosphorus in shallow water lakes is a crucial process in the response of lake ecosystems to environmental changes.Unravelling the seasonal fluctuation pattern of phosphorus and its influencing factors in lakes is key to scientific and effective lake management.This study utilized 12 years of continuous monthly monitoring data from Lake Chaohu to analyze the seasonal variation pattern of phosphorus and its driving factors.The results indicated that phosphorus in Lake Chaohu exhibited a distinct intra-annual fluctuation pattern.The period from February to April represented the low values of phosphorus,which gradually increased thereafter,with the peak phosphorus concentration occurring from August to October,reaching the annual high.During the high phosphorus period,the total phosphorus concentration was 0.058 mg/L higher on average than the low phosphorus period,representing an average increase of 84%.Moreover,this fluctuation amplitude increased gradually from east to west.The intra-annual variation patterns of phytoplankton biomass and chlorophyll-a did not precisely align with the phosphorus fluctuation pattern.The peak values of phytoplankton biomass occurred earlier in the year than the peak phosphorus values,and there was a period of substantial phytoplankton distribution even in winter when phosphorus concentrations were relatively low.The explanatory power of algal intra-annual fluctuation amplitude on phosphorus fluctuation amplitude was less than 10%,indicating a limited influence of phytoplankton's intra-annual changes on the seasonal phosphorus fluctuation in Lake Chaohu.The intra-annual fluctuation pattern of phosphorus in Lake Chaohu was likely primarily driven by the natural release of internal phosphorus,with limited evidence of the regulatory effects of algal pump suction and external pollution entering the lake.This study enhanced our understanding of the seasonal variation of phosphorus in shallow lakes and held significant scientific implications for formulating str

关 键 词：磷 季节性模式 浮游植物 叶绿素A 巢湖 

分 类 号：X524[环境科学与工程—环境工程]