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湖泊科学  2015 

表层底泥翻耕对太湖藻源性湖泛的预控作用

DOI: 10.18307/2015.0407

Keywords: 表层底泥,翻耕模拟,湖泛,理化性质,挥发性硫化物

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Abstract:

表层底泥已被证实是引发或诱发太湖湖泛发生的主要因素,但能否通过像控制湖泊内源污染的翻耕方式对湖泛形成预控,则有待与过程有关的实验研究.模拟研究太湖易发湖泛区底泥翻耕对藻源性湖泛的控制作用,跟踪监测不同翻耕深度和翻耕后时长,对照和处理组上覆水的视觉、嗅觉、营养盐和挥发性硫化物浓度,以及表层底泥理化性质的变化.结果表明,未翻耕的对照组在模拟实验中发生了湖泛,翻耕10cm和翻耕20cm差异不大,但翻耕后时长对湖泛发生影响较大.刚翻耕后(1d)即进行藻源性湖泛模拟的处理组发生了湖泛,但在程度和持续时间上均低于对照组;翻耕180d和540d的处理组,10cm和20cm翻耕深度均未发生湖泛.合理选择翻耕的施工时间,可以有效预防和控制湖泛的发生.

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