Abstract：
The world\'s largest \"green tide\" (Ulva prolifera) has occurred every year since 2007 in the Yellow Sea. The Subei Shoal area is thought to be the origin of the green tide. Based on field data from 2016 to 2023, seasonal and interannual variations of dissolved nutrients and their ecological effects in the Subei Shoal were analyzed. Spatial distribution of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP) and dissolved silicate (DSi) showed clear terrestrial sources, while ammonia (NH4-N) and dissolved organic nitrogen (DON) were not solely controlled by terrestrial sources. The seasonal variations of NH4-N, DIN, DON, DIP and DSi concentrations were significant, and the interannual variations of DIN, DON, DIP and DSi concentrations showed general decreasing trends from 2016 to 2023. The key factors affecting the seasonal and interannual variations of DIN and DIP concentrations were terrestrial input, aquaculture wastewater discharge, atmospheric deposition, submarine groundwater discharge and macroalgae absorption, while the dominant factor determining the variations of DSi concentrations was terrestrial input. NH4-N and DON concentrations were mainly influenced by aquaculture wastewater discharge and the absorption and release of macroalgae. The high nutrient concentrations in the Subei Shoal throughout the year provided sufficient material basis for the growth of Ulva prolifera in the source area of green tide outbreak.
摘要：
自2007年以来，黄海每年都会发生世界上最大的“绿潮”（Ulvaprophera）。苏北浅滩地区被认为是绿潮的起源。基于2016-2023年的田间数据,分析了苏北浅滩溶解性养分的季节和年际变化及其生态效应。溶解无机氮的空间分布(DIN)溶解的无机磷（DIP）和溶解的硅酸盐（DSi）显示出清晰的陆源，而氨（NH4-N）和溶解的有机氮（DON）并非仅由陆源控制。NH4-N的季节变化,DIN,DON,DIP和DSi浓度显著，以及DIN的年际变化，DON,从2016年到2023年，DIP和DSi浓度呈总体下降趋势。影响DIN和DIP浓度季节和年际变化的关键因素是陆地输入，水产养殖废水排放，大气沉降,海底地下水排放和大型藻类吸收，而决定DSi浓度变化的主要因素是地面输入。NH4-N和DON浓度主要受养殖废水排放和大型藻类吸收释放的影响。苏北浅滩全年的高养分浓度为绿潮爆发源区Ulva增殖的生长提供了充分的物质基础。
