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351.
对龙岩市水环境现状调查表明,地下水水质良好,地表水超标严重。主要超标因子为TP、NH4-N、COD、BOD;水质污染严重的原因主要是受养猪业废水和生活污水影响,提出了相应的对策措施。 相似文献
352.
353.
Xiaoyong Liu Mingshi Wang Xiaole Pan Xiyue Wang Xiaolong Yue Donghui Zhang Zhigang M Yu Tian Hang Liu Shandong Lei Yuting Zhang Qi Liao Baozhu Ge Dawei Wang Jie Li Yele Sun Pingqing Fu Zifa Wang Hong He 《环境科学学报(英文版)》2021,33(5):20-32
The region along the Taihang Mountains in the North China Plain (NCP) is characterized by serious fine particle pollution. To clarify the formation mechanism and controlling factors, an observational study was conducted to investigate the physical and chemical properties of the fine particulate matter in Jiaozuo city, China. Mass concentrations of the water-soluble ions (WSIs) in PM2.5 and gaseous pollutant precursors were measured on an hourly basis from December 1, 2017, to February 27, 2018. The positive matrix factorization (PMF) method and the FLEXible PARTicle (FLEXPART) model were employed to identify the sources of PM2.5. The results showed that the average mass concentration of PM2.5 was 111 μg/m3 during the observation period. Among the major WSIs, sulfate, nitrate, and ammonium (SNA) constituted 62% of the total PM2.5 mass, and NO3? ranked the highest with an average contribution of 24.6%. NH4+ was abundant in most cases in Jiaozuo. According to chemical balance analysis, SO42?, NO3?, and Cl? might be present in the form of (NH4)2SO4, NH4NO3, NH4Cl, and KCl. The liquid-phase oxidation of SO2 and NO2 was severe during the haze period. The relative humidity and pH were the key factors influencing SO42- formation. We found that NO3? mainly stemmed from homogeneous gas-phase reactions in the daytime and originated from the hydrolysis of N2O5 in the nighttime, which was inconsistent with previous studies. The PMF model identified five sources of PM2.5: secondary origin (37.8%), vehicular emissions (34.7%), biomass burning (11.5%), coal combustion (9.4%), and crustal dust (6.6%). 相似文献
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355.
Interactions of arsenic and phenanthrene on their uptake and antioxidative response in Pteris vittata L 总被引:2,自引:0,他引:2
Sun L Yan X Liao X Wen Y Chong Z Liang T 《Environmental pollution (Barking, Essex : 1987)》2011,159(12):3398-3405
The interactions of arsenic and phenanthrene on plant uptake and antioxidative response of Pteris vitatta L. were studied hydroponically. The combination of arsenic and phenanthrene decreased arsenic contents in fronds by 30-51%, whereas increased arsenic concentrations 1.2-1.6 times in roots, demonstrating the suppression of arsenic translocation compared to the corresponding treatment without phenanthrene. Under the co-exposure, As(III) concentrations in fronds deceased by 12-73%, and at higher arsenic exposure level (≥10 mg/L), As(V) in fronds and As(III) in roots increased compared to the single arsenic treatment. Arsenic exposure elevated phenanthrene concentrations in root by 39-164%. The co-existence of arsenic and phenanthrene had little impact on plant arsenic accumulation, although synergistic effect on antioxidants was observed, suggesting the special physiological process of P. vitatta in the co-exposure and application potential of P. vitatta in phytoremediation of arsenic and PAHs co-contamination. 相似文献
356.
使用建筑弃土与污泥堆肥配制营养土并应用于园林绿化。以凤仙花为研究对象,通过盆栽实验观察和对比分析了凤仙花从播种到开花整个生命过程的生长指标,并对其结果进行模糊评价。结果表明,凤仙花播种期和生长期各生长指标随着营养土中堆肥含量的增加而增加,并在堆肥施用量30%时达到最佳;营养土中的重金属对凤仙花的生长速度有抑制效应,主要集中在播种期和生长期初期,随着凤仙花的生长成熟,重金属的胁迫效应持续减少,并在成熟期显著降低,重金属对凤仙花地表部分的抑制更为明显;建筑弃土与污泥堆肥配制的营养土对园林植物营养效果良好,成熟期的凤仙花生物量大幅度增加,最大增幅550%;通过模糊评价并综合考虑配置方案,最佳堆肥施用量为30%。 相似文献
357.
Polycyclic aromatic hydrocarbons in urban soils of Beijing: status, sources, distribution and potential risk 总被引:7,自引:0,他引:7
Peng C Chen W Liao X Wang M Ouyang Z Jiao W Bai Y 《Environmental pollution (Barking, Essex : 1987)》2011,159(3):802-808
We studied the source, concentration, spatial distribution and health risk of 16 polycyclic aromatic hydrocarbons (PAHs) in urban soils of Beijing. The total mass concentration of 16 PAHs ranged from 93 to 13 141 μg kg−1 with a mean of 1228 μg kg−1. The contour map of soil PAH concentrations showed that the industrial zone, the historical Hutong district and the university district of Beijing have significantly higher concentrations than those in remainder of the city. The results of sources identification suggested that the primary sources of PAHs were vehicle exhaust and coal combustion and the secondary source was the atmospheric deposition of long-range transported PAHs. The incremental lifetime cancer risks (ILCRs) of exposing to PAHs in the urban soils of Beijing for adult were 1.77 × 10−6 and 2.48 × 10−5, respectively under normal and extreme conditions. For child, they were 8.87 × 10−7 and 6.72 × 10−6, respectively under normal and extreme conditions. 相似文献
358.
廖俊国 《中国人口.资源与环境》1995,5(3):40-45
西藏是世界上一个十分独特的区域;西藏高原农业可持续发展在世界农业可持续发展中具有重要科学意义。为此,本文分析了西藏农业生产条件和历史现状,对不同农业生产类型进行了概括和总结。 相似文献
359.
金川有色金属公司结合企业的实际,应用安全系统工程原理,创建了安全生产标准化运作机制及管理模式,并在实践中取得了明显的成效。 相似文献
360.
景观生态学在生态环境影响评价中的应用-重庆二郎科技园区生态环境影响探讨 总被引:4,自引:0,他引:4
采用生态环境影响评价中的景观生态学方法,结合景观生态学的评价要求,从景观空间结构、恢复能力、内在异质性、绿色拼块之间的连通程度以及组织开放性等方面,对重庆市二郎科技园区规划的景观生态作出评价和预测,提出园区生态建设应注意的问题和采取的措施,以推动二郎科技园区的生态建设和经济、社会的可持续发展。 相似文献