(1) 中国科学院烟台海岸带研究所海岸带环境过程与生态修复重点实验室

By uploading the nutrient concentration, salinity and suspended particulate matter in the Xiao Qinghe River(XQR)estuary(in July and September)and along the XQR(from WangDao, in July)into the classical LOICZ model and muddy LOICZ model, the residual time and nutrient budget in the estuary and the river box were calculated. The estuarine LOICZ model result showed that the residual time of water mass in the estuary was 0.67 day and 3.09 days in July and September, respectively. The average budgets of DIP were -2.96 * 10~3 mol/d in July and -1.72 * 10~3 mol/d in September, and the average budgets of DIN were -1.55 * 10~6 mol/d in July and -0.77 * 10~6 mol/d in September, respectively. This indicated that the XQR estuary was the high productivity area to be the sink of N and P resulting from the contribution of biology and primary production. The flux of P was far less than that of N due to the phosphorus-limitation in the XQR estuary. The negative value of p-r of the XQR indicated the nitrogen metabolism in the estuary. The riverine LOICZ model demonstrated that many pollutants were from branch channels and wastewater discharges into the XQR from the Yangkou community. It is of note to highlight here that the LOICZ model was a zero-order model that provides order of magnitude estimates of the fate of the nutrients, and that it is unable to mimic the subtle controls involved in estimating nitrogen fixation and denitrification, such as the effects of dissolved oxygen, carbon, and nitrate availability.