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121.
从生态学观点看湖泊藻类控制的技术体系 总被引:10,自引:0,他引:10
富营养化水域中,引起湖泊水华和海洋赤潮的藻类疯长被称为“生态癌”。从生态学的观点分析了湖泊退化的原因,提出生态系统内物质循环的规模是否在自然环境条件所能支持的限度内是分析湖泊治理成效的判据,而将参与物质循环的过量物质从湖泊中移出则是湖泊治理技术的根本着眼点。文章还从生态学的视角架构了湖泊藻类控制的技术体系,并对每种技术在体系中的作用做了分析,由此提出了湖泊治理的技术路线。 相似文献
122.
磁化处理对水体的复氧速率及生物效应影响的研究 总被引:7,自引:1,他引:7
通过试验证明,磁化处理不仅可引起水体物理、化学性质的异常变化,而且还强烈影响水体的生物性质(刺激藻类生长、抑止异养菌数等)。磁化处理引起藻类生产力显著提高的特殊生物效应,对加速水体的复氧能力,提高自净效率,有着重要的意义。 相似文献
123.
124.
Impacts of atrazine in aquatic ecosystems 总被引:26,自引:0,他引:26
A portion of all herbicides applied to forests, croplands, road sides, and gardens are inevitably lost to water bodies either directly through runoff or indirectly by leaching through groundwater into ephemeral streams and lakes. Once in the aquatic environment, herbicides may cause stress within aquatic communities and radically alter community structure. Atrazine is one of the most effective and inexpensive herbicides in the world and is consequently used more frequently than any other herbicide. Atrazine is frequently detected in aquatic waters, and has been known to affect reproduction of aquatic flora and fauna, which in turn impacts on the community structure as a whole. This paper presents a summary of the reported direct and indirect impacts of atrazine on aquatic organisms and community structure. The information can be used for developing improved management guidelines and legislation. It is concluded that a single universal maximum limit on the atrazine application in catchments, as suggested by many regulatory authorities, does not provide adequate protection of the aquatic environment. Rather, it is advocated that flexible limits on the application of atrazine be developed in line with the potential risk of contamination to surface and subsurface water and fragility of the aquatic environment. 相似文献
125.
Yanxia Zhao Huiqing Lian Chang Tian Haibo Li Weiying Xu Sherub Phuntsho Kaimin Shih 《Frontiers of Environmental Science & Engineering》2021,15(4):58
126.
为了探究浮游细菌和蓝藻暴发之间的关系,利用实时荧光定量PCR和高通量测序技术,对夏季蓝藻暴发期间太湖竺山湾表层水和底泥中浮游细菌群落结构和多样性进行研究。结果表明,从门水平来看,水样和底泥中平均相对丰度最高的为变形菌门,放线菌门次之,此外蓝藻门也有一定的比例,可为水华暴发提供预警指示;从属水平来看,水样中的优势细菌主要为GpXI和GpIIa,底泥中为Gp6和GpIIa。 相似文献
127.
Research on biofuel production pathways from algae continues because among other potential advantages they avoid key consequential effects of terrestrial oil crops, such as competition for cropland. However, the economics, energetic balance, and climate change emissions from algal biofuels pathways do not always show great potential, due in part to high fertilizer demand. Nutrient recycling from algal biomass residue is likely to be essential for reducing the environmental impacts and cost associated with algae-derived fuels. After a review of available technologies, anaerobic digestion (AD) and hydrothermal liquefaction (HTL) were selected and compared on their nutrient recycling and energy recovery potential for lipid-extracted algal biomass using the microalgae strain Scenedesmus dimorphus. For 1 kg (dry weight) of algae cultivated in an open raceway pond, 40.7 g N and 3.8 g P can be recycled through AD, while 26.0 g N and 6.8 g P can be recycled through HTL. In terms of energy production, 2.49 MJ heat and 2.61 MJ electricity are generated from AD biogas combustion to meet production system demands, while 3.30 MJ heat and 0.95 MJ electricity from HTL products are generated and used within the production system.Assuming recycled nutrient products from AD or HTL technologies displace demand for synthetic fertilizers, and energy products displace natural gas and electricity, the life cycle greenhouse gas reduction achieved by adding AD to the simulated algal oil production system is between 622 and 808 g carbon dioxide equivalent (CO2e)/kg biomass depending on substitution assumptions, while the life cycle GHG reduction achieved by HTL is between 513 and 535 g CO2e/kg biomass depending on substitution assumptions. Based on the effectiveness of nutrient recycling and energy recovery, as well as technology maturity, AD appears to perform better than HTL as a nutrient and energy recycling technology in algae oil production systems. 相似文献
128.
Yuxiong Huang Manyu Gao Wenjing Wang Ziyi Liu Wei Qian Ciara Chun Chen Xiaoshan Zhu Zhonghua Cai 《Frontiers of Environmental Science & Engineering》2022,16(9):122