近年胶州湾陆源SGD及其营养盐输送

Transport of groundwater and nutrients from land into Jiaozhou Bay

根据青岛市胶州湾周边的水文地质条件及地下水位、水质动态特征，运用断面法计算了2001～2003年该区地下水及其N、P、Si无机营养盐向海湾的输送量。研究表明近年该区地下水向海湾的输送量分别为（1．87～2．41）×10^6m^3，其中白沙河平原输送量占95％以上。地下水向海湾的NO2^-、NH4^＋、PO4^3-输送量较少，而NO3^-和可溶性SiO2的输送量较大，分别达（4．3～6．6）×10^6mol／a、（0．6～1．1）×10^6mol／a，分别占河流输送量的20％和1．3％，白沙河平原地下水NO3^-输送量占研究区地下水总输送量的99％。

The transport of groundwater and nutrients and its content （ N, P, Si） from land into Jiaozhou Bay is estimated by the section method based on the physiogeographic and hydrogeologic conditions. The results showed that the SGD were （ 1.87 - 2.41 ） × 10^6 m^3 from 2001 to 2003, the Baisha Aquifer groundwater discharge was the largest, accounted to more than 95%. The discharges of NO3 and dissolved SiO2 were larger than others from groundwater into Jiaozhou Bay, there was about （4.3 ～6.6 ） and （0.6 ～ 1.1 ）×10^6 mol/year, accounted to 20% and 1.3% of river discharge, respectively. The Baisha Aquifer discharged 99% of all NO3 flux into Jiaozhou Bay, because of large groundwater discharge of high NO3 coming from long-term vegetables production history.