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引用本文:张奇.人工湖滨湿地磷素汇-源功能转换及理论解释.湖泊科学,2007,19(1):46-51. DOI:10.18307/2007.0107
ZHANG Qi.Shift of phosphorus sink-source functions of constructed wetlands and a theoretical explanation. J. Lake Sci.2007,19(1):46-51. DOI:10.18307/2007.0107
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人工湖滨湿地磷素汇-源功能转换及理论解释
张奇
作者单位
张奇 中国科学院南京地理与湖泊研究所, 南京210008 
摘要:
采用水动力弥散和吸附理论建立了表流湿地水-土界面磷通量模型, 定义了湿地汇-源转换的临界水体磷浓度值.模型揭示, 湿地对磷的截留是水动力弥散和吸附共同作用的结果.在湿地建成运行初期, 吸附作用明显, 临界浓度值较低, 湿地较好地发挥截磷功能.随着湿地的运行, 土壤吸附趋于饱和, 吸附作用减弱, 水动力弥散变为主导因素, 临界浓度值增大, 使湿地除磷功能减弱, 在一定条件下, 反而可能释放磷.本文建立的磷通量模型具有明确的物理基础, 能解释湿地对磷去除功能退化的机理和汇-源转换条件.应用模型对抚仙湖马料河湿地的观测数据作了初步解释, 该湿地运行两年后, 临界磷浓度值为0.58 mg/L, 湿地除磷功能明显衰退.
关键词:  人工湿地  汇-源功能  水动力弥散  吸附  磷通量模型
DOI:10.18307/2007.0107
分类号:
基金项目:中国科学院“百人计划”项目;国家自然科学基金(40471018);中国科学院南京地理与湖泊研究所所长基金(CXNI-GLAS-2004-1);教育部留学回国人员科研基金联合资助.
Shift of phosphorus sink-source functions of constructed wetlands and a theoretical explanation
ZHANG Qi
Abstract:
A mathematical model was presented to calculate phosphorus flux across water-soil interface of constructed wetlands by employing hydrodynamic dispersion and sorption theory.A critical value of inflow phosphorus concentration ( CR) was derived from the model.The critical value can be used to indicate the shift condition as nutrients sink or source of wetlands.According to the model, removal of phosphorus is a joint effect of hydrodynamic dispersion and sorption.During the first few years after construction of wetlands, the sorption process is dominant resulting in a low value of CR.During that period, the condition of the wetland as a nutrient sink can be easily satisfied, which make the wetland effectively remove phosphorus.After several years'running, the wetland soil may become sorption-saturated, which make the hydrodynamic dispersion process dominant.This further results in an increased value of CR.At that stage, the condition of the wetland as a nutrient sink may be hardly met, and the wetland may function as a nutrient source rather than a sink.The model presented in this paper is physically based and can explain the decline of phosphorus removal efficiency of a wetland with time and the shift condition as a sink or a source.The model was used to interpret the observation data of a constructed wetland right upstream of Fuxianhu Lake, Yunnan Province.It was concluded that the wetland did not have apparent phosphorus removal effects after two years'operating with a value of 0.58 mg/L for CR.
Key words:  Constructed wetland  sink-source function  hydrodynamic dispersion  sorption  phosphorus flux model Constructed wetland  sink-source function  hydrodynamic dispersion  sorption  phosphorus flux model
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