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91.
Mingjing Ke Yizhi Ye Yan Li Zhigao Zhou Nuohan Xu Lan Feng Jinfeng Zhang Tao Lu Zhiqiang Cai Haifeng Qian 《环境科学学报(英文版)》2021,33(8):66-75
Chemical exposure can indirectly affect leaf microbiota communities, but the mechanism driving this phenomenon remains largely unknown. Results revealed that the co-exposure of glyphosate and multi-carbon nanotubes (CNTs) caused a synergistic inhibitory effect on the growth and metabolism of Arabidopsis thaliana shoots. However, only a slight inhibitory effect was induced by nanotubes or glyphosate alone at the tested concentrations. Several intermediate metabolites of nitrogen metabolism and fatty acid synthesis pathways were upregulated under the combined treatment, which increased the amount of energy required to alleviate the disruption caused by the combined treatment. Additionally, compared with the two individual treatments, the glyphosate/nanotube combination treatment induced greater fluctuations in the phyllosphere bacterial community members with low abundance (relative abundance (RA) <1%) at both the family and genus levels, and among these bacteria some plant growth promotion and nutrient supplement related bacteria were markable increased. Strikingly, strong correlations between phyllosphere bacterial diversity and metabolites suggested a potential role of leaf metabolism, particularly nitrogen and carbohydrate metabolism, in restricting the range of leaf microbial taxa. These correlations between phyllosphere bacterial diversity and leaf metabolism will improve our understanding of plant-microbe interactions and the extent of their drivers of variation and the underlying causes of variability in bacterial community composition. 相似文献
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水资源持续利用的价值评价与配置问题 总被引:2,自引:0,他引:2
综述了水资源价值评价与配置的基本问题。水价值阐释了四方面内容 :( 1 )权属 ,( 2 )评价者 ,( 3)多元性及相应的评价方法 ,( 4 )地域性。就三方面分析了水配置 :( 1 )制度配置 ,( 2 )市场配置 ,( 3)保障基本需求。并就水资源持续利用提出了一些建议。 相似文献
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大庆油田聚合物驱后油藏微生物多样性研究 总被引:10,自引:0,他引:10
从大庆油田4个聚合物驱后的采油井中提取总DNA,扩增其16S rDNA片段,克隆到大肠杆菌,然后用ARDRA法对所得的298个克隆中的插入片段进行分析,建立了16S rDNA克隆文库.采用文库库容值(C)、香农-威纳指数(H)和均匀度指数(E)对文库微生物多样性进行了评价.结果表明,4个样品中共得出22个操作分类单元(OUT).其中4个OUT(在整个群落中占78.18%,9个OUT只有一个克隆.对22个OUT的代表克隆序列、GenBank数据库比对和系统发育分析表明,聚驱后油井中的细菌基本属于α变形菌纲(24.83%)、γ变形菌纲(23.49%)、δ变形菌纲(35.56%)和未培养微生物(16.78%).与石油烃降解和产生物表面活性剂相关的假单胞菌(Pseudomonas)和不动杆菌(Acinetobacter),在文库中占的比例分别是17.79%和6.02%. 相似文献
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为了说清伊犁河出、入境断面六六六、DDT等4种有机氯农药的检出问题,中国与哈萨克斯坦双方分别在中方的三道河子断面和哈方的杜本断面进行了联合研究性监测。中方采取现场采集平行样并加带全程序空白样品,实验室采用溶剂空白、实验室空白、全程序空白、平行双样以及加标回收分析等质控措施,使哈方专家认可中方监测数据的准确性和有效性,保证了双方的监测结果被中哈环保合作委员会接受和采用。研究以中哈跨界河流实际监测的典型实例,论证了质量保证与质量控制措施(QA/QC)在跨国界河流联合监测工作中的重要作用。 相似文献
97.
随着我国高速铁路的快速发展,其运营引发的环境振动问题日益凸显,成为当今社会关注的一个热点.总结国内外学者对高速铁路环境振动的研究工作,从3方面对其进行阐述:振动源强特性及传播规律、环境振动评价标准及预测方法的制定、减振隔振方法的研究,并提出相关建议. 相似文献
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Yaru Zhang Jinfeng Bai Jun Xu Xiangyun Zhong Zhenning Zhao Hongchun Liu 《环境科学学报(英文版)》2013,(S1):S190-S195
The stamp-charging coke making process has some advantages of improving the operation environment, decreasing fugitive emission, higher gas collection efficiency as well as less environmental pollution. This article describes the different structure strength and high temperature thermal properties of 4 different types of coke manufactured using a conventional coking process and the stamp-charging coke making process. The 4 kinds of cokes were prepared from the mixture of five feed coals blended by the petrography blending method. The results showed that the structure strength indices of coke prepared using the stamp-charging coke method increase sharply. In contrast with conventional coking process, the stamp-charging process improved the coke strength after reaction but had little impact on the coke reactivity index. 相似文献
100.
Xiangyun Zhong Shiyong Wu Yang Liu Zhenning Zhao Yaru Zhang Jinfeng Bai Jun Xu Bai Xi 《环境科学学报(英文版)》2013,(S1):S186-S189
The evolvement of morphology and structure of the coal with different metamorphic degrees during coking process in the vertical furnace was investigated by infrared Image detector. Moreover, the temperature distribution in the radial direction and the crack formation were also studied in heating process. The results show that the amount of crack and the shrinkage level of char decrease with the coal rank rising. In addition, the initial temperature of crack formation for char increases with the coal rank rising. 相似文献