| 典型湖泊有机聚集体时空特征及驱动因子 |
| 摘要点击 1348 全文点击 1365 投稿时间：2022-06-01 修订日期：2022-07-20 |
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| 中文关键词 有机聚集体(OA) 附着细菌 湖泊营养状态 藻类水华 沉积物再悬浮 营养盐循环 驱动因子 |
| 英文关键词 organic aggregates(OA) particle-attached bacteria lake nutrient status algal blooms sediment resuspension nutrient recycling driving factor |
| 作者 | 单位 | E-mail | | 谢贵娟 | 皖西学院生物与制药工程学院, 六安 237012
中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
中国科学院大学资源与环境学院, 北京 100049 | xeiguijuan@126.com | | 龚伊 | 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008 | | | 朱富成 | 皖西学院生物与制药工程学院, 六安 237012 | | | 刘昌利 | 皖西学院生物与制药工程学院, 六安 237012 | | | 卢宝伟 | 皖西学院生物与制药工程学院, 六安 237012 | | | 邓辉 | 皖西学院生物与制药工程学院, 六安 237012 | | | 汤祥明 | 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
中国科学院大学资源与环境学院, 北京 100049 | xmtang@niglas.ac.cn |
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| 中文摘要 |
| 有机聚集体（OA）是水体中物质循环和能量流通的重要枢纽，但在不同营养水平湖泊中的比较研究仍相当匮乏.于2019~2021年间，采集了不同季节贫营养抚仙湖、中营养天目湖、中度富营养太湖和重度富营养星云湖表层水样，利用扫描电镜、表面荧光显微镜和流式细胞仪等研究了4个典型湖泊中OA及其附着细菌的时空变化特征.结果表明：①抚仙湖、天目湖、太湖和星云湖中，OA丰度的年均值分别为1.4×104、7.0×104、27.7×104和16.0×104ind ·mL-1；OA附着细菌丰度的年均值分别为0.3×106、1.9×106、4.9×106和6.2×106 cells ·mL-1；附着细菌占总细菌的比值分别为30%、31%、50%和38%.②夏季OA丰度显著高于秋冬季；但夏季附着细菌占总细菌的比值为26%，显著低于其它3个季节.③湖泊营养状态是影响OA及其附着细菌丰度的最重要环境因子，可单独解释OA及其附着细菌丰度时空变化的50%和68%.④OA上富含营养盐和有机质，尤其是星云湖，其OA中颗粒态磷和氮占比高达69%和59%，有机质占比达79%.未来气候变化和湖泊藻类水华扩张背景下，藻源性OA在有机质矿化降解及营养盐循环中的作用可能会进一步加大. |
| 英文摘要 |
| Organic aggregates (OA) are the important circulation hub of matter and energy in aquatic ecosystems. However, the comparison studies on OA in lakes with different nutrient levels are limited. In this study, spatio-temporal abundances of OA and OA-attached bacteria (OAB) in oligotrophic Lake Fuxian, mesotrophic Lake Tianmu, middle-eutrophic Lake Taihu, and hyper-eutrophic Lake Xingyun were investigated in different seasons during 2019-2021 using a scanning electron microscope, epi-fluorescence microscope, and flow cytometry. The results showed that:① the annual average abundances of OA in Lake Fuxian, Lake Tianmu, Lake Taihu, and Lake Xingyun were 1.4×104, 7.0×104, 27.7×104, and 16.0×104 ind·mL-1, whereas the annual average abundances of OAB in the four lakes were 0.3×106, 1.9×106, 4.9×106, and 6.2×106 cells·mL-1. The ratios of OAB:total bacteria (TB) in the four lakes were 30%, 31%, 50%, and 38%, respectively. ② OA abundance in summer was significantly higher than that in autumn and winter; however, the ratio of OAB:TB in summer was approximately 26%, which was significantly lower than that in the other three seasons. ③ Lake nutrient status was the most important environmental factor that affected the abundance variations of OA and OAB, accounting for 50% and 68% of the spatio-temporal variations in OA and OAB abundances. ④ Nutrient and organic matters were enriched in OA, especially in Lake Xingyun; the proportions of particle phosphorous, particle nitrogen, and organic matters in this lake were as high as 69%, 59%, and 79%, respectively. Under the circumstance of future climate change and the expansion of lake algal blooms, the effects of algal-originated OA in the degradation of organic matters and nutrient recycling would be increased. |
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