| 太湖水体中胶体磷含量初探 |
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| 引用本文： | 孙小静,张战平,朱广伟,秦伯强.太湖水体中胶体磷含量初探[J].湖泊科学,2006,18(3):231-237. |
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| 作者姓名： | 孙小静 张战平 朱广伟 秦伯强 |
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| 作者单位： | 1. 中国科学院南京地理与湖泊研究所,南京,210008
2. 中国科学院南京地理与湖泊研究所,南京,210008;中国科学院研究生院,北京,100039 |
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| 基金项目： | 中国科学院知识创新工程项目;中国科学院资助项目 |
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| 摘 要： | 室内静态模拟不同温度下太湖15个湖区柱状沉积物磷酸根释放,分析了相应表层沉积物形态磷,以及梅梁湾间隙水中相关离子Al(Ⅲ)、Fe(Ⅱ)、Ca(Ⅱ)和PO43-含量的季节变化．研究表明,受陆源影响较大的泥区通常是太湖内源磷的稳定源;而在开敞度较大的湖区,由于表层沉积物胶体的物化吸附,使得温度对底泥磷释放的影响作用减弱,并易产生磷的“内汇”现象;在梅梁湾区成汇区,还加上春夏季藻类的局部超负荷需磷这一控制因素,从而使得太湖大部分泥区在一年中至少发生一次源-汇转换过程．化学热力学分析揭示,Al-P较之Fe-P和Ca-P更易在界面发生溶解可能是太湖表层沉积物Al-P与PO43-P释放速率呈显著相关(r=0．3858>r1-0．01,n=45)的内在原因．虽然沉积物中Fe-P有较高的释磷潜力,但浅水湖所营造的沉积物表层氧化层和广泛覆盖的无机胶体及粘土矿物的强吸附介质,可能是抑制沉积物中Fe-P释放成为优势的主要因素．估算太湖沉积物-水界面磷的净通量为899．4±573．6 t／a,约占太湖磷入湖量的1／4-1／2,其中成汇通量约为-91．2±42．4 t/a．
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| 关 键 词： | 磷释放 内汇 源-汇转换 铁磷 铝磷 化学热力学 太湖 |
| 收稿时间： | 2005-08-15 |
| 修稿时间： | 2005-10-08 |
Content of colloidal phosphorus in water of Lake Taihu, China |
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| SUN Xiaojing,ZHANG Zhanping,ZHU Guangwei and QIN Boqiang.Content of colloidal phosphorus in water of Lake Taihu, China[J].Journal of Lake Science,2006,18(3):231-237. |
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| Authors: | SUN Xiaojing ZHANG Zhanping ZHU Guangwei and QIN Boqiang |
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| Institution: | Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China,College of Environmental and Resource Sciences, Zhejiang University,Hangzhou 310028, P. R. China,Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China and Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China |
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| Abstract: | Concentration of colloidal phosphorus in Lake Taihu, China, was determined in this paper. Lake water was sampled in April, 2005. Cross-flow filtration technique was applied to extract colloid from the water. The result shows that colloidal phosphorus concentration in Lake Taihu varied from 0.017 to 0.029 mg/L. In Meiliang Bay, an algae type zone, it is 0.023-0.029 mg/L; while in Gonghu Bay, a grass type zone, it is 0.017-0.022 mg/L. The colloidal phosphorus account for 28.6% of total phosphorus (TP) in Meiliang Bay, and account for 39.3% of total phosphorus (TP) in Gonghu Bay, respectively. The true-dissolved phosphorus in Meiliang Bay is four times of that in Gonghu Bay. |
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| Keywords: | Phosphorus release internal sink source-sink transition iron phosphorus aluminium phosphorus chemical thermodynamics Lake Taihu |
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