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引用本文:杨柳英,焦树林,王磊,李银久,李娟,韦宗校.岩溶峡谷型水库沉积物磷形态分布及污染评价——以万峰水库为例.湖泊科学,2024,36(4):1131-1143. DOI:10.18307/2024.0426
Yang Liuying,Jiao Shulin,Wang Lei,Li Yinjiu,Li Juan,Wei Zongxiao.Distribution of phosphorus forms and pollution assessment of sediments in karst canyon reservoirs: A case study of Wanfeng Reservoir. J. Lake Sci.2024,36(4):1131-1143. DOI:10.18307/2024.0426
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岩溶峡谷型水库沉积物磷形态分布及污染评价——以万峰水库为例
杨柳英1,2, 焦树林1,2, 王磊1, 李银久1,2, 李娟1,2, 韦宗校1,2
1.贵州师范大学地理与环境科学学院/喀斯特研究院, 贵阳 550001;2.贵州省喀斯特山地生态环境国家重点实验室培育基地, 贵阳 550001
摘要:
开展岩溶峡谷型水库沉积物磷形态分布、影响因素及污染风险研究,对区域水环境治理和水生态系统管理具有重要意义。研究选取典型岩溶峡谷型水库——万峰水库为研究对象,在分析沉积物磷形态分布特征基础上,识别沉积物磷形态空间分异影响因素并进行磷污染评价。结果表明,(1)沉积物总磷(TP)含量为79.37~438.04 mg/kg,无机磷(IP)占比为73.26%~78.84%,IP是沉积物磷的主要赋存形态。铁铝结合态无机磷(Fe/Al-Pi)含量为16.86 ~91.82 mg/kg,是IP的主要赋存形态;弱吸附态有机磷(H2O-Po)含量为0.27~8.03 mg/kg,是有机磷(OP)的主要赋存形态。(2)残渣态磷(Res-P)、弱吸附态无机磷(H2O-Pi)、钙结合态无机磷(Ca-Pi)、潜在活性无机磷(NaHCO3-Pi)、Fe/Al-Pi是TP空间分异的主要影响因素。沉积物的厚度对于TP具有多重作用,与其他因素的共同作用影响显著。(3)生物有效性磷(BAP)含量为66.97~201.46 mg/kg,占TP的55.6%~59.6%;磷污染指数均值为0.53,生物有效性指数均值为0.81。表明沉积物磷污染程度整体为轻度污染,但仍存在潜在的内源磷污染上覆水体风险。建议岩溶峡谷型水库在控制外源磷输入的同时,也应加强对内源磷的管理,以降低内源磷释放污染上覆水体的风险。
关键词:  沉积物  磷形态  污染评价  生物有效性磷  岩溶峡谷型水库  万峰水库
DOI:10.18307/2024.0426
分类号:
基金项目:贵州省科技支撑计划项目(黔科合支撑[2023]一般214)和贵州省基础研究计划项目(黔科合基础[2020]1Y252)联合资助。
Distribution of phosphorus forms and pollution assessment of sediments in karst canyon reservoirs: A case study of Wanfeng Reservoir
Yang Liuying1,2, Jiao Shulin1,2, Wang Lei1, Li Yinjiu1,2, Li Juan1,2, Wei Zongxiao1,2
1.School of Geography and Environmental Science/Karst Research Institute, Guizhou Normal University, Guiyang 550001, P. R. China;2.State Key Laboratory Incubation Base for Karst Mountain Ecological Environment of Guizhou Province, Guiyang 550001, P. R. China
Abstract:
Study on the distribution, influencing factors, and pollution risk of phosphorus forms in karst canyon reservoir sediments is highly concerned in water pollution control and aquatic ecosystem management. The study selected a typical karst canyon reservoir (Wanfeng Reservoir) as the study area. By analyzing the distribution of sediment phosphorus forms, this study identified the influencing factors of the spatial variation of sediment phosphorus forms, and assessed phosphorus pollution. The results showed that (1) the total phosphorus (TP) content in sediments had a range from 79.37 to 438.04 mg/kg, with inorganic phosphorus (IP) accounting for 73.26% to 78.84% of the total. IP was the dominant form of phosphorus in sediments. The content of iron-aluminum-bound inorganic phosphorus (Fe/Al-Pi) was 16.86 to 91.82 mg/kg, which was the dominant form of IP. Weakly adsorbed organic phosphorus (H2O-Po) with a content of 0.27 to 8.03 mg/kg was the dominant form of organic phosphorus (OP). (2) Residual phosphorus (Res-P), weakly adsorbed inorganic phosphorus (H2O-Pi), calcium-bound inorganic phosphorus (Ca-Pi), potential active inorganic phosphorus (NaHCO3-Pi), and iron-aluminum-bound inorganic phosphorus (Fe/Al-Pi) were the main influencing factors causing the spatial variation of TP. The sediment depth had multiple impacts on TP, and significantly influenced by the interaction with other factors. (3) Bioavailable phosphorus (BAP) had a range from 66.97 to 201.46 mg/kg, accounting for 55.6% to 59.6% of total phosphorus. The mean value of phosphorus pollution index and bioavailability index were 0.53 and 0.81, respectively. This indicated that the overall degree of phosphorus pollution in sediments was mild, implying certain pollution risk to the overlying water. In addition to controlling external phosphorus loading, managing sediment phosphorus is also recommended for karst canyon reservoirs to reduce sediment phosphorus release and pollution to the overlying water.
Key words:  Sediment  phosphorus forms  pollution evaluation  bioavailable phosphorus  karst canyon reservoirs  Wanfeng Reservoir
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