| 引用本文: | 郑昕,陈丽,仇菲,张涛,张昭阳,尚丽,白宁静,陈小林,赵帅营,孔令阳,陈光杰.砷污染治理背景下阳宗海浮游植物生物量的时空分布模式及驱动因子.湖泊科学,2024,36(1):34-42. DOI:10.18307/2024.0111 |
| Zheng Xin,Chen Li,Qiu Fei,Zhang Tao,Zhang Zhaoyang,Shang Li,Bai Ningjing,Chen Xiaolin,Zhao Shuaiying,Kong Lingyang,Chen Guangjie.Spatio-temporal distribution and driving factors of phytoplankton biomass in Lake Yangzong under the background of arsenic pollution treatment. J. Lake Sci.2024,36(1):34-42. DOI:10.18307/2024.0111 |
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| 砷污染治理背景下阳宗海浮游植物生物量的时空分布模式及驱动因子 |
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郑昕, 陈丽, 仇菲, 张涛, 张昭阳, 尚丽, 白宁静, 陈小林, 赵帅营, 孔令阳, 陈光杰
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云南师范大学地理学部, 云南省高原地理过程与环境变化重点实验室, 昆明 650500
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| 摘要: |
| 在社会经济发展和流域开发持续的背景下,砷污染已成为我国部分水体面临的重要环境问题,目前对砷污染防控的生态效应与修复效果评价仍缺乏系统识别。湖泊生态系统中浮游植物是重要的生产者,砷等重金属污染可以直接影响浮游植物生长、物种演替和初级生产力水平,浮游植物已成为指示砷污染水平及其生态效应的敏感指标。本研究以长期受到砷污染胁迫并经历污染治理的阳宗海为研究对象,设置南、中、北3个调查位点,于2015年4月-2019年12月对浮游植物和水质因子开展季节调查和空间分析,通过识别浮游植物生物量的时空分布模式与驱动因子,评价了砷污染与治理下浮游植物生物量的变化机制和生态修复效果。调查结果显示,采样期间阳宗海浮游植物以蓝藻门为主,浮游植物的生物量范围为0.7~30.4 mg/L,平均生物量在2016年最低((3.0±1.8) mg/L)、在2017年最高((10.5±8.9) mg/L)。ANOVA分析结果显示,浮游植物生物量存在显著的季节差异而空间差异不明显。相关分析结果显示,阳宗海浮游植物生物量与砷浓度和透明度呈显著负相关,而与水体温度和pH呈显著正相关。多元线性回归分析进一步显示,砷和水温是驱动阳宗海浮游植物生物量变化的显著环境因子。由此可见,在重金属污染湖泊经过修复后,水体砷遗留物的毒性效应仍然对浮游植物生长产生了明显的抑制作用,表明了水体重金属污染物可能具有长期的沉积物释放作用与持久的生态毒理效应。 |
| 关键词: 阳宗海 浮游植物 生物量 砷污染 污染治理 |
| DOI：10.18307/2024.0111 |
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| 基金项目:国家自然科学基金项目(32060276,31960250,41461096)、云南省基础研究计划项目面上项目(202301AT070079)、云南省科技计划项目(202203AC100002-02)和异龙湖高原浅水湖泊云南省野外科学观测研究站项目(202305AM070002)联合资助。 |
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| Spatio-temporal distribution and driving factors of phytoplankton biomass in Lake Yangzong under the background of arsenic pollution treatment |
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Zheng Xin, Chen Li, Qiu Fei, Zhang Tao, Zhang Zhaoyang, Shang Li, Bai Ningjing, Chen Xiaolin, Zhao Shuaiying, Kong Lingyang, Chen Guangjie
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Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Change, Faculty of Geography, Yunnan Normal University, Kunming 650500, P.R. China
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| Abstract: |
| Arsenic contamination has become an important environmental issue of some water bodies in China under the background of economic development and basin exploitation. However, limited attention has been paid to the effects of arsenic pollution prevention and ecological restoration. Phytoplankton is the key primary producer in lake ecosystems. Arsenic can directly affect the phytoplankton growth, species succession and primary productivity, and has become a sensitive indicator of arsenic pollution and its ecological effects. Lake Yangzong has a long history of arsenic pollution and subsequent remediation efforts. We conducted a seasonal survey on phytoplankton and environmental factors of Lake Yangzong covering the south, central and north parts of the lake from 2015 to 2019. The survey data were used to identify the spatio-temporal pattern and driving factors of phytoplankton biomass, and to evaluate the mechanism of phytoplankton biomass changes and effect of eco-restoration under arsenic pollution and treatment. The results showed that the phytoplankton was mainly composed of Cyanophyta. The phytoplankton biomass was in a range of 0.7-30.4 mg/L, with the lowest value in 2016 ((3.0±1.8) mg/L) and the highest value in 2017 ((10.5±8.9) mg/L). The phytoplankton biomass showed significant seasonal variations, but did not show significant spatial difference. The correlation analysis showed that the phytoplankton biomass had a significantly negative correlation with arsenic concentration and transparency, but had a significantly positive correlation with water temperature and pH. The multivariable linear regression model further showed that temperature and arsenic were the key environmental factors in driving the change of phytoplankton biomass. Thus, the arsenic residues in water body still inhibit phytoplankton growth after remediation in heavy metal polluted lakes, indicating that heavy metal pollutants may have long-term effects due to sediment release and enduring ecotoxicological impacts. |
| Key words: Lake Yangzong phytoplankton biomass arsenic pollution pollution treatment |
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