东湖紫外光敏感磷与可酶解磷的分布及其相互关系

东湖紫外光敏感磷与可酶解磷的分布及其相互关系 Distribution of Phosphatase Hydrolysable Phosphorus and UV-Sensitive Phosphorus Compounds and a Relationship Between Them in Donghu Lake 刘华丽 LIU Hua-li1 1 2 3 4 first-author 周易勇 ZHOU Yi-yong2 1 2 3 4 李建秋 LI Jian-qiu2 1 2 3 4 宋春雷 SONG Chun-lei2 1 2 3 4 曹秀云 CAO Xiu-yun2 1 2 3 4 武汉科技学院 武汉科技学院 Wuhan Institute of Science and Technology Wuhan Institute of Science and Technology 中国科学院水生生物研究所 中国科学院水生生物研究所 Institute of Hydrobiology, Chinese Academy of Sciences Institute of Hydrobiology, Chinese Academy of Sciences 中国科学院水生生物研究所,湖北,武汉,430073 中国科学院水生生物研究所,湖北,武汉,430073 ,湖北,武汉,430072 ,湖北,武汉,430072 初步讨论了武汉东湖不同工作站中紫外光敏感磷 （UVSP）与可酶解磷 （PHP）的季节变化以及间隙水中二者和碱性磷酸酶活性 （APA）的存在及其相互关系 间隙水中PHP与UVSP的存在 ,说明湖泊沉积物亦为间接有效的磷库 紫外光照射可显著提高间隙水中o P的浓度 ,却明显抑制溶解态碱性磷酸酶 （APase）的活性 ,这一结果未能支持UVSP释放o P的过程仍遵从酶促机制的假说 . Phosphorus compounds in lakes can release directly bioavailable orthophosphate （o-P） upon irradiation by UV light （UVSP）, or hydrolysis by phosphatase （PHP）. Seasonal variations were observed in UVSP in surface water, and PHP in surface, overlying and interstitial water at three experimental stations in Donghu Lake. Occurrence of both PHP and UVSP in interstitial water suggested that sediment could act as a sink of potentially available phosphorus. In interstitial water, o-P was significantly elevated, while dissolved alkaline phosphatase was significantly inhibited. This fact does not support the view that the enzymatic reaction underlies the mechanism of UVSP release. 东湖分布 可酶解磷 紫外光敏感磷 碱性磷酸酶活性 季节变化 distribution in Donghu Lake hydrolysable phosphorus UV-sensitive phosphorus alkaline phosphatase activity seasonal variation X131.2 中国科学院知识创新工程重大项目 （KZCXI SW 12 II 0 2 0 2 ）;重要方向项目 （KSCXZ SW 10 2 ）;国家自然科学基金资助项目（ 2 0 1770 33,396 70 14 9,39170 16 5 ） 2002-06-01 2021-04-01 6