| 引用本文: | 高光,秦伯强,朱广伟,范成新,季江.太湖梅梁湾中碱性磷酸酶的活性及其与藻类生长的关系.湖泊科学,2004,16(3):245-251. DOI:10.18307/2004.0309 |
| GAO Guang,QIN Boqiang,ZHU Guangwei,FAN Chengxin,JI Jiang.Seasonal Variation of Alkaline Phosphatase Activity in Meiliang Bay, Lake Taihu. J. Lake Sci.2004,16(3):245-251. DOI:10.18307/2004.0309 |
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| 摘要: |
| 通过对1998年5月-1999年5月的太湖梅梁湾水体中碱性磷酸酶活性及其它水化学因子的同步实地监测, 初步探讨了富营养化较严重的太湖梅梁湾湖区的碱性磷酸酶活性的时空变化规律及其与藻类水华的相关性.研究表明, 水体中各种形态磷之间的转化非常快.在磷的循环、转化过程中, 碱性磷酸酶的作用至关重要.太湖梅梁湾各采样点水体中碱性磷酸酶的最大反应速率(Vmax)的年际变化有着显著的规律性, 各点位在春季(3-4月)及夏季(7-8月)均分别出现峰值, 与水体中水华出现的峰值相吻合.尤其在水体中水华暴发前的4月份, 各采样点中的碱性磷酸酶的活性急剧增加, 其Vmax均为年内的最大值或接近最大值, 预示着水体中其它形态磷的转化速率加快, 为水华的形成提供了充足的活性磷.水体中特异性碱性磷酸酶活性(总碱性磷酸酶活性/Chl.a)与水体中的PO43-存在着较好的负相关.尤其是在春季相关性更加显著, 可达-0.9以上;夏季太湖梅梁湾水华暴发时, 水体中的磷酸盐浓度远低于碱性磷酸酶的激发阈值, 藻类体中的酶被诱导大量产生, 从而使得水体中碱性磷酸酶的数量、活性急剧增加, 达到较高的水平.这种短时间的有机质快速降解以及由此导致的营养盐释放, 维持了水体中藻类的生长. |
| 关键词: 碱性磷酸酶活性 动力学参数 磷循环 太湖 |
| DOI：10.18307/2004.0309 |
| 分类号: |
| 基金项目:中国科学院知识创新工程重大项目(KZCX1-SW-12-II-02);"973"项目(2002CB412305) |
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| Seasonal Variation of Alkaline Phosphatase Activity in Meiliang Bay, Lake Taihu |
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GAO Guang, QIN Boqiang, ZHU Guangwei, FAN Chengxin, JI Jiang
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Nanjing Institute of Geography &Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
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| Abstract: |
| Seasonal variation of the alkaline phosphatase activity (APA) and its kinetic parameters was studied from May, 1998 to May 1999 in five sampling sites of Meiliang Bay.The results show that there were stronger variations of the alkaline phosphatase activity and its kinetic parameters (Omax, Pm) in different seasons and different sampling sites.The Omax of APA were higher in this lake and the APA was the negative correlation with orthophosphate, especially in summer.Phytoplankton seem to compensate for their phosphorus deficiency by increasing the alkaline phosphatase activity and changing the kinetic parameters to improved the ability to use lower concentration phosphorus. |
| Key words: Alkaline phosphatase active kinetic parameters phosphorus recycling Lake Taihu |
