长江口湿地沉积物-水界面无机氮交换总通量量算系统研究

基于MapObjects组件式GIS技术和数学建模方法,以Visual Basic为开发平台,建立了长江口湿地沉积物-水界面无机氮交换通量空间插值模型、总通量量算模型和量算系统,该系统的主要功能包括对无机氮界面交换通量信息查询检索,空间插值分析,以及对长江口湿地不同岸段、不同季节无机氮交换总通量综合和动态量算.利用该系统和长江口湿地2000年10月-2004年7月无机氮界面交换通量季节性实测数据,对长江口湿地沉积物-水界面无机氮交换总通量进行了量算.结果表明:长江口湿地沉积物在春季向水体释放无机氮,在夏季、秋季和冬季则表现为净化水体中的无机氮,全年总体表现为净化水体中的无机氮.量算系统的实际应用表明,该系统在定量分析长江口湿地生态功能过程中发挥了重要作用.

Study on Calculating System of Dissolved Inorganic Nitrogen Exchange Total Fluxes at the Sediment-Water Interface in Yangtze Estuary Tidal Wetlands

A calculating system of dissolved inorganic nitrogen exchange total fluxes at the sediment-water interface in Yangtze estuary tidal wetlands was presented.This software system is based on MapObjects ComGIS technology,mathematics modeling method and Visual Basic language.It has many functions such as querying and searching,and spatial interpolation analysis,and can perform dynamic and general calculating for dissolved inorganic nitrogen total fluxes for different sections of Yangtze estuary tidal wetlands in different seasons.Using this software and first-hand measurement data of inorganic nitrogen fluxes of Yangtze estuary tidal wetlands from October 2000 to July 2004,dissolved inorganic nitrogen exchange total fluxes at the sediment-water interface for different sections and different seasons were calculated.The result indicated: in the spring,Yangtze estuary tidal wetlands release inorganic nitrogen fluxes into the water;in the summer,autumn and winter,the wetlands purify inorganic nitrogen in the water;and over the whole year,the wetlands purify inorganic nitrogen in the water.The application of this system indicated that it played a key role in analyzing the ecological function of Yangtze estuary tidal wetlands.