Phosphorus released from sediment of Dianchi Lake and its effect on growth of Microcystis aeruginosa
Phosphorus released from sediment of Dianchi Lake and its effect on growth of Microcystis aeruginosa
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DOI：
10.1007/s11356-016-6816-9
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发表时间：
2016-05
影响因子：
5.8
通讯作者：
Junzhuo Liu;Xiongxin Luo;Naiming Zhang;Yonghong Wu
中科院分区：
文献类型：
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作者：
Junzhuo Liu;Xiongxin Luo;Naiming Zhang;Yonghong Wu
湖泊沉积物中储存的磷是一种内在的营养源，可以释放到上覆水体中，加剧藻华。以滇池为模拟环境，研究沉积物中磷向上覆水体的释放及其对铜绿微囊藻生长的影响。滇池沉积物总磷（TP）含量为1.7 ~ 1.8 mg g−1，以Ca结合磷（Ca- p, 50 ~ 54%）和有机磷（Org-P, 28 ~ 32%）为主要组分。沉积物向上覆水体释放总磷的8%，其中Fe/Al结合磷（Fe/Al- p, 26%）和Org-P（65%）是主要释放组分。上覆水体磷浓度由0.14 ~ 0.16 mg L−1增加到0.28 ~ 0.33 mg L−1。生物量密度。正磷酸盐是藻类生长的主要生物可利用磷组分，铜绿绿菌量与正磷酸盐浓度呈正相关（R2= 0.825）。Org-P可以被m部分利用。铜绿杆菌不会引起开花。为了调节沉积物中磷的释放，从而减少蓝藻繁殖的风险，需要对磷的地球化学循环有一个很好的了解。
Phosphorus stored in lake sediments is an inner nutrient source and can be released into overlying water to exacerbate algal blooms. A simulated microcosm of Dianchi Lake was built to investigate phosphorus release from sediments to overlying water and its effect on the growth ofMicrocystis aeruginosa. The sediments of Dianchi Lake had a total phosphorus (TP) content of 1.7–1.8 mg g−1with Ca bound phosphorus (Ca-P, 50–54 %) and organic phosphorus (Org-P, 28–32 %) as the main fractions. The sediments released 8 % of TP into the overlying water with Fe/Al bound phosphorus (Fe/Al-P, 26 %) and Org-P (65 %) being the main fractions released. The phosphorus concentration of the overlying water increased from 0.14–0.16 to 0.28–0.33 mg L−1. The biomass density ofM. aeruginosawas positively correlated (R2= 0.825) with the concentration of orthophosphate, which was the predominant bioavailable phosphorus fraction for algal growth. Org-P can be partly utilized byM. aeruginosabut will not cause a bloom. A good understanding of the geochemical cycles of phosphorus is needed for regulating phosphorus release from sediments and thereby reducing the risk of cyanobacterial blooms.