白洋淀和密云水库野生鲤鱼耳石热释光特征研究

Thermoluminescence characteristics of otoliths of wild carps (cyprinoid) in the Baiyangdian Lake and the Miyun Reservoir

鱼耳石的主体由生命矿物文石组成,其研究在过去二三十年中已取得了不少成果,但是将热释光技术用于鱼耳石的研究未见报道。本文对生长在河北白洋淀和北京密云水库的野生鲤鱼耳石的热释光曲线特征进行了研究,分析了两水域野生鲤鱼耳石中陷阱深度(E)值的差别。热释光测试结果显示,白洋淀10颗鲤鱼耳石样品热释光曲线的峰点温度(T)、发光强度(I)、积分强度(S)和半高宽(W)的均值大于密云水库,而且前者热释光曲线各参数值和E值的稳定程度均不如后者。分析还表明白洋淀鱼耳石在不同温度下的电子和空穴的逃逸几率(α)均大于密云水库。据调查,白洋淀各水体较密云水库水体的环境复杂,污染程度高。研究结果表明,鱼耳石的热释光曲线特征对鱼所生长的水体水质和水环境相当敏感,通过更深入研究,可能成为水质和水环境的重要标型。

The major composition of otoliths is biomineral aragonite. In the past two or three decades, quite a few achievements have been made in the study of fish otoliths, but no advances in researches on the thermoluminescence characteristics of the fish otoliths have been reported in literature. In this paper, thermoluminescence characteristics of otoliths of the wild carps （cyprinoid） in the Baiyangdian Lake of Hebei Province and the Miyun reservoir of Beijing were studied, and the difference of energy gap （E） between the fish otoliths in the two regions was analyzed. The experimental results indicate that such thermoluminescence curve parameters as Glow Peak （T）, Thermoluminescence Intensity （I）, Integral （ S ） and Half Width （W） of the fish otoliths from the Baiyangdian Lake are greater than those from the Miyun reservoir, and the stability of thermoluminescence curve parameters and energy gap （E） of the former is weaker than that of the latter. Compared with things of the Miyun reservoir, the electrons and vacancies trapped in otoliths of the Baiyangdian Lake are more likely to escape. According to the investigation, the Baiyangdian Lake has suffered heavier pollution and eutrophication than the Miyun reservoir . Therefore , the thermoluminescence curve characteristics of the fish ototiths are quite sensitive to water quality and water environment, and this can be regarded as an important indicator to the contamination degree of the water.