2021年10月—2022年4月通过现场调查开展了武汉市典型富营养化湖泊后官湖藻类越冬及复苏过程研究。结果表明:后官湖越冬期共检出浮游植物6门26属,其中以绿藻门(Chlorophyta)、硅藻门(Bacillariophyta)、蓝藻门(Cyanophyta)为主;从时间尺度上看,水体中藻类丰度于11月初(秋季)开始下降,12月份—次年2月份(冬季)处于较低水平,3—4月份(春季)呈上升趋势;底泥藻类丰度从10—11月份则呈现先上升后下降的趋势,并于1月末2月初降至最低,随后上升,该变化较水体而言有所延迟,可能与藻类垂向迁移有关。相关性分析表明:水体和底泥中的藻细胞密度对水温均有较强的响应(p<0.01),水体和底泥中藻细胞密度的变化分别主要取决于绿藻和蓝藻的变化,说明越冬期大量蓝藻细胞沉降至湖底;冬季(11月份—次年2月份)后官湖水体与底泥藻类丰度的比值相对较低,说明大多数藻细胞在冬季沉降在底泥中。研究揭示了武汉市后官湖藻类越冬及复苏过程,为揭示水华发生机理,开展水华防治提供理论支撑。
Abstract
From October 2021 to April 2022, we conducted on-site investigations to study the overwintering and recovery process of algae in Houguan Lake, a typical eutrophic lake in Wuhan. The results of our research indicated the presence of six phyla and twenty-six genera of phytoplankton during the overwintering period in Houguan Lake. The dominant phyla observed were Chlorophyta, Bacillariophyta, and Cyanophyta. Regarding the temporal scale, the algae abundance in water started declining in early November (autumn), remained at a low level from December to next February (winter), and displayed an upward trend from March to April (spring). In contrast, the algae abundance in sediments exhibited an initial increase from October to November, followed by a decrease until the end of January and early February. Subsequently, it began to increase again, which is a delay compared to the algae abundance in water. Such delay could be attributed to the vertical migration of algae. Correlation analysis revealed a strong response of algal cell density in both the water and sediment to changes in water temperature (p<0.01). During the overwintering, a substantial number of cyanobacterial cells settled at the lake's bottom, which indicated that the algal cell density in both water and sediment were dependent on the changes of Chlorophyta and Cyanophyta, respectively. In winter (from November to next February), the ratio of algae abundance in water to that in sediment in Houguan Lake was relatively low, indicating that most algal cells settled in the sediment during this period. Our study unveils the overwintering and recovery process of algae in Houguan Lake, thus providing essential theoretical support for understanding algal bloom mechanisms and developing prevention and control strategies.
关键词
底泥种源 /
藻类越冬与复苏 /
水华预防 /
浮游植物 /
后官湖
Key words
sediment provenance /
algal overwintering and recovery /
bloom prevention /
phytoplankton /
Houguan Lake
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基金
武汉市应用基础前沿专项(2020020601012285)
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