中文摘要：

利用油酸修饰合成了具有良好光化学稳定性,对氧不敏感,可发射520nm荧光的量子点（QDs）,以八乙基卟啉铂（PtOEP）作为荧光指示剂,聚苯乙烯（PS）为包埋基质,掺杂QDs为参比光染料制备了溶解氧比率法传感膜。针对短时间内大量繁殖的浒苔造成的生态灾害现象,利用制备的平面光极在实验室内对浒苔影响下的海水—沉积物周围的溶解氧的动态变化进行了模拟观测研究,实验结果表明,高CO_2浓度下的浒苔藻体的呼吸作用要高于正常CO_2水平,而两者在光合作用带来的氧浓度的升高方面并没有显著性差异,均可升高至7mg/L以上。高温下的浒苔很快进入衰退消亡,不利于光合作用,氧最高值仅达2.3mg/L,沉降后可在沉积物—海水界面附近形成大范围无氧,局部贫氧区,改变了海底区域的溶解氧分布体系,将会对海底的生态结构和生活环境产生较大影响。

英文摘要：

The QDs modified with oleic acid is synthesized by the authors.It is lipophilic,of high-efficiency and oxygen insensitivity,and its emission（520 nm）overlaps the Q band absorption peak of Platinum（Ⅱ）with octaethylporphyrin（PtOEP）as the reference.The sensing film is fabricated by using QDs doped with PtOEP which is encapsulated in plasticized polystyrene（PS）.The sensor is used for direct mapping of the spatiotemporal variation in oxygen distribution within the effects of Enteromorpha Prolifera in littoral zone and bottom sediment.The result shows that high CO_2 may significantly enhance the respiration of Enteromorpha Prolifera,although the oxygen concentration by photosynthesis activity is not significantly changed（about 7 mg/L only）.The Enteromorpha Prolifera begins to decay under high temperature and the peak of the oxygen concentration is then dropped to 2.3 mg/L.The decaying Enteromorpha Prolifera at the sediment-water interface forms a severe hypoxia zone in seawater around the sediment-water interface and the hypoxia zone has great impact on the marine environment.