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引用本文:董旭辉,羊向东,刘恩峰.湖北太白湖400多年来沉积硅藻记录及湖水总磷的定量重建.湖泊科学,2006,18(6):597-604. DOI:10.18307/2006.0607
DONG Xuhui,YANG Xiangdong,LIU Enfeng.Diatom records and reconstruction of epilimnetic phosphorus concentration in Lake Taibai (Hubei Province) over the past 400 years. J. Lake Sci.2006,18(6):597-604. DOI:10.18307/2006.0607
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湖北太白湖400多年来沉积硅藻记录及湖水总磷的定量重建
董旭辉1,2, 羊向东1, 刘恩峰1
1.中阳科学院南京地评与湖泊研究所, 南京210008;2.中国科学院研究院, 北京100049
摘要:
依据沉积物钻孔的高分辨率硅藻研究,利用长江中下游现代湖泊硅藻与总磷转换函数结果,定量重建了太白湖400余年来占湖水总磷浓度的变化.结果表明,约1630 AD前和1 800-1924 AD期间,湖水总磷浓度较低,在50-68μg/L之间;1630-1800 AD,总磷浓度偏高,总体上在50-160μg/L之间变化,变幅较大.1800-1924AD,总磷浓度明显下降为谷值段,且变化相对稳定(50μg/L左右);1924-1953AD,总磷浓度仍较低,但有增加趋势(50-63μg/L);20世纪50年代开始,总磷浓度出现快速增加;至1970年后,总磷浓度超过120μg/L左右.利用样品相似对比的方法发现约80%的样品具有较好的重建效果.古湖水总磷浓度值的变化揭示了该湖两次明显的富营养化过程,初步探讨了其驱动机制.根据重建结果提出:太白湖自然营养本底总磷值约为50μg/L左右,可作为该湖治理时的参考目标.
关键词:  太白湖  沉积硅藻  总磷  定量重建  营养本底
DOI:10.18307/2006.0607
分类号:
基金项目:中国科学院重大创新项目(KZCX1-SW-12);国家973项目(2002CB412300)共同资助
Diatom records and reconstruction of epilimnetic phosphorus concentration in Lake Taibai (Hubei Province) over the past 400 years
DONG Xuhui1,2, YANG Xiangdong1, LIU Enfeng1
1.Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Graduate School, of the Chinese Academy of Sciences, Beijing 100039, P. R. China
Abstract:
The epilimnelic. total phosphorous coni-entralions ([TP]) over the past 400 years were reconslrut'led for Lake Taibai, baaed on the high resol u I ion a 1 fossil diatom aIdy from one sediment core in that lake an eslab-lislied regional diatom-TP transfer funclion. The resulln indiraled dial, during 1630 AD and 1800-1924 AD, [TP] was low within 50-68 (μg/L; 1630-J 800 AD,[TP] were much higher and changed (iratnnlicalK. wliirli was williin 50 -160 μg/L; 1800-1924 AD,[TP] showed low values with litlle changes (remained alxxil 50 jxg/ L); 1924-1953 AI), [TP] kept tow values, showing slight increase (50-63 μg/ L); From 1950s [TP] began to increase and after 1970 [ TP] exceeded 120 μg/L. Match Analog Technique was used to estimate the validily of I he refonslrnt'tion results and il showed that about eighly percent samples provided reasonable values. The changes lialigns of the rei-onstrutted [TP] revealed that Iwo eutrophicalion stages had occurred and the causes wm、preliminarily discussed. Finally 50 μg/L was propounded to be llie naluralness value for TP index in Lake Taibai, whit'li could be used as the restoration target.
Key words:  Lake Taibai  diatom  TP  reconslruclion
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