Phosphorus release from cyanobacterial blooms during their decline period in eutrophic Dianchi Lake, China
Phosphorus release from cyanobacterial blooms during their decline period in eutrophic Dianchi Lake, China
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中国富营养化的滇池蓝藻水华衰退期磷的释放
DOI：
10.1007/s11356-018-1517-1
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发表时间：
2018-03
影响因子：
5.8
通讯作者：
Lu Yin
中科院分区：
文献类型：
--
作者：
Zhang Shenghua;Wang Weilu;Zhang Kaixiang;Xu Peiyao;Lu Yin
水华蓝藻在衰退期释放的磷（P）是湖泊磷生物地球化学循环中最重要的部分之一，是维持湖泊富营养化状态的重要养分自我调节过程。通过原位实验研究了滇池枯水期蓝藻水华的磷释放机制。在围栏内，蓝藻逐渐死亡，这一过程进一步影响水质参数并导致水华蓝藻释放磷。在整个实验期间，pH值和电导率（EC）大幅增加，而氧化还原电位（ORP）下降。在所有释放的磷形态中，正磷酸盐（ortho-P）是主要的磷释放形态，分别占水体总磷（TP）增量和藻类TP减少量的96.7%和67.8%。根据沉积物中的总磷和上覆水体的损失磷，可以得出藻类释放的正磷也被沉积物吸收的结论。水华蓝藻对TP、有机磷(OP)和邻磷的释放均遵循一级动力学，且邻磷的释放速率远高于OP(p< 0.05)。此外，根据总胞外多糖（EPS）测定和相关的Pearson相关分析，蓝藻中TP和ortho-P的释放可能取决于荚膜多糖（CPS）的减少和菌落鞘解聚。综上所述，在蓝藻水华衰退期，大量的正磷逐渐释放并被沉积物吸附，这些生物有效磷可以为新生蓝藻提供充足的养分，并有助于在沉积物、水体和蓝藻水华之间构建新的内部磷循环。
The phosphorus (P) release from bloom-cyanobacterium during its decline period is one of the most important parts involved in lake P-biogeochemical cycle, which is an important nutrient self-regulating process to sustain eutrophic status in lakes. An in situ experiment was set up to study the phosphorus release mechanisms of cyanobacterial blooms in Dianchi Lake during its decline period. In the enclosure, the cyanobacteria were dying out gradually and this process further affected the water quality parameters and lead to P release from bloom-cyanobacteria. The pH and electric conductivity (EC) increased substantially, while the redox potential (ORP) decreased during the whole experimental period. Among all the released P forms, the orthophosphate (ortho-P) was the main released P form and accounted for 96.7 and 67.8% of the total phosphorus (TP) increment in the water and the TP reduction in algae respectively. According to the TP in sediment and lost P of overlying water column, it could be concluded that the ortho-P released from algae was absorbed by sediment as well. The release of TP, organic P (OP), and ortho-P from bloom-cyanobacteria all followed the first-order kinetics, and the release rate of ortho-P was much higher than that of OP (p< 0.05). Furthermore, according to the total extracellular polysaccharide (EPS) determination and related Pearson’s correlation analysis, the release of TP and ortho-P from bloom-cyanobacteria would probably depend on the reduction of capsular polysaccharide (CPS) and colonial sheath disaggregation. In conclusion, a large amount of ortho-P was released and adsorbed by sediment gradually during cyanobacterial bloom decline period, and these bioavailable P could provide the sufficient nutrient for newborn cyanobacteria and could contribute to the construction of a new internal P cycle among sediment, water, and cyanobacterial bloom.
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影响因子：
2.6
作者：
R. A. Osgood
通讯作者：
R. A. Osgood
影响因子：
5.8
作者：
Junzhuo Liu;Xiongxin Luo;Naiming Zhang;Yonghong Wu
通讯作者：
Junzhuo Liu;Xiongxin Luo;Naiming Zhang;Yonghong Wu
DOI：
10.3724/issn1000-3207-2004-2-124-m
发表时间：
2004-03
期刊：
Acta Hydrobiologica Sinica
影响因子：
--
作者：
F. Tao;Ao Hong-yi;Liu Jiantong;Cai Qing-hua;Liu Yongding
通讯作者：
F. Tao;Ao Hong-yi;Liu Jiantong;Cai Qing-hua;Liu Yongding
DOI：
--
发表时间：
2007
期刊：
China Environmental Science
影响因子：
--
作者：
Zhu Guangwei
通讯作者：
Zhu Guangwei
影响因子：
2.6
作者：
B. Spears;L. Carvalho;R. Perkins;A. Kirika;D. M. Paterson
通讯作者：
B. Spears;L. Carvalho;R. Perkins;A. Kirika;D. M. Paterson