| 外源Ca2+和K+作用下河口区碱蓬水质净化效果和耐盐碱提高机制 |
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| 引用本文： | 吴丹,孙萍,陈广琳,陈友媛,彭昌盛.外源Ca2+和K+作用下河口区碱蓬水质净化效果和耐盐碱提高机制[J].环境科学,2019,40(12):5384-5393. |
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| 作者姓名： | 吴丹 孙萍 陈广琳 陈友媛 彭昌盛 |
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| 作者单位： | 中国海洋大学环境科学与工程学院,青岛,266100;中国海洋大学环境科学与工程学院,青岛266100;中国海洋大学海洋环境与生态教育部重点实验室,青岛266100 |
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| 基金项目： | 山东省重点研发项目;山东省自然科学基金 |
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| 摘 要： | 入海河流中较高的氮、磷污染负荷严重影响近岸海域水质,必须加强陆海统筹.但河口区受海水倒灌影响,水体盐碱浓度高且变化范围大,植物生长困难,去除氮磷能力低,提高植物生存能力是亟需解决的难题.本文通过添加适当浓度的Ca~(2+)和K~+,研究提高植物耐盐碱能力以及降低富营养化风险的可能性.结果表明,在pH 8、盐度20‰条件下,外源Ca~(2+)和K~+浓度分别为8 mmol·L~(-1)和10 mmol·L~(-1)的水培实验中,碱蓬对总氮及总磷的去除效率均最高,为对照组的1. 53～1. 87倍,生长最好,相对生长速率(RGR)为对照组的2. 4倍和2. 0倍,同浓度Ca~(2+)的缓解作用大于K~+.外源Ca~(2+)和K~+提高耐盐碱能力的机制体现在碱蓬渗透调节功能的提升:无机渗透调节机制为平衡Na~+/K~+,提高碱蓬持水能力,叶片与根系中无机离子含量与含水量相关性均在0. 966以上;有机渗透调节机制为促进甜菜碱等小分子有机物积累,降低细胞膜脂过氧化作用,Ca~(2+)和K~+缓解作用下叶片丙二醛含量最大降幅达72. 9%和61. 7%.外源Ca~(2+)和K~+能够增强碱蓬渗透调节能力,提升耐盐碱能力,促进碱蓬生长,提高碱蓬对氮磷的去除率.
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| 关 键 词： | 碱蓬 盐碱胁迫 河口区 无机离子 小分子有机物 |
| 收稿时间： | 2019/6/3 0:00:00 |
| 修稿时间： | 2019/7/5 0:00:00 |
Water Purification Effect and Saline-alkali Tolerance Improvement Mechanism of Suaeda salsa in the Estuary Area |
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| WU Dan,SUN Ping,CHEN Guang-lin,CHEN You-yuan and PENG Chang-sheng.Water Purification Effect and Saline-alkali Tolerance Improvement Mechanism of Suaeda salsa in the Estuary Area[J].Chinese Journal of Environmental Science,2019,40(12):5384-5393. |
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| Authors: | WU Dan SUN Ping CHEN Guang-lin CHEN You-yuan and PENG Chang-sheng |
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| Institution: | College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China,College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China,College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China,College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China and College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China |
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| Abstract: | |
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| Keywords: | Suaeda salsa saline-alkali stress estuary areas inorganic ions small organic molecule |
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