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101.
江苏海岸湿地水质污染特征与海陆一体化调控 总被引:6,自引:0,他引:6
2000年江苏海岸湿地人海河流河口淡水监测断面有30%的水质处于劣Ⅴ类,满足Ⅲ类水质的仅占10%;近岸海域海水监测断面有50%的水质处于Ⅳ标准。人类扰动的频率与强度的日益加大是水质污染的主要原因,而河流携带大量污染物是水质污染的主要途径。江苏海岸湿地水质污染防治的关键在于流域海陆水环境系统的一体化调控,侧重点是调控技术路线和水质污染控制层次的设计。环境管理控制区划的方案是:横向上由陆向海划分为上游流域、近岸陆域、海岸湿地和离岸海域4个环境控制带;纵向上自北向南以水系汇流特征、行政区划特征、海域特点划分为Ⅳ类环境功能区及若干亚区。 相似文献
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ISAPEC中知识自动获取的设计与实现 总被引:1,自引:0,他引:1
剖析了利用人工神经网络实现大气污染总量控制规划智能决策支持系统(ISAPEC)中知识自动获取的必要性,论述了ISAPEC中知识的自动获取的设计与实现过程,并用一实例进行了验证。结果表明用人工神经网络实现知识的自动获取与知识的人工获取相比既具有更高的时间效率,又能保证更高的质量。 相似文献
104.
Jia Penghui Huang Yimei Chen Mengli Qi Xiping Hou Hongyang 《Environmental science and pollution research international》2023,30(4):8987-8997
Environmental Science and Pollution Research - The performance of garden waste on spent mushroom substrate (SMS) and chicken manure (CM) co-composting efficiency and humification is unclear.... 相似文献
105.
Soils from two typical tidal salt marshes with varied salinity in the Yellow River Delta wetland were analysed to determine possible effects of salinity on soil carbon sequestration through changes in soil microbiology. The mean soil respiration (SR) of the salt water–fresh water mixing zone (MZ) was 2.89 times higher than that of the coastal zone (CZ) (4.73 and 1.63?μmol?m?2?s?1, respectively, p?.05), and soil dehydrogenase activity was the main microbial factor influencing SR. In addition to the higher soil microbial biomass, the MZ had more β-Proteobacteria than the CZ, as well as some specific bacteria with strong heterotrophic metabolic activity such as Pseudomonas sp. and Limnobacter sp. that might have led to its higher dehydrogenase activity and respiratory rates. Additionally, the CZ possessed more Halobacteria and Thaumarchaeota with the ability to fix CO2 than the MZ. Significantly lower soil salinity in MZ (4.25?g?kg?1) was suitable for β-Proteobacteria, but detrimental for Halobacteria compared with CZ (7.09?g?kg?1, p?.01), which might lead to the lower microbial decomposition capacity of soils in CZ. As a result, the CZ has a higher soil organic carbon content than the MZ. 相似文献
106.
Yan SHAO Haobo HOU Guangxing WANG Sha WAN Min ZHOU 《Frontiers of Environmental Science & Engineering》2016,10(1):192-200
Fly ash is a hazardous byproduct of municipal solid wastes incineration (MSWI). An alkali activated blast furnace slag-based cementitious material was used to stabilize/solidify the fly ash at experimental level. The characteristics of the stabilized/solidified fly ash, including metal leachability, mineralogical characteristics and the distributions of metals in matrices, were tested by toxic characteristic leaching procedure (TCLP), X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) respectively. Continuous acid extraction was utilized to extract metal ions and characterize their leaching behavior. The stabilization/solidification procedure for MSWI fly ash demonstrates a strong fixing capacity for the metals by the formation of C-S-H phase, hydrated calcium aluminosilicate and ettringite. The stabilized/solidified fly ash shows a dense and homogeneous microstructure. Cr is mainly solidified in hydrated calcium aluminosilicate, C-S-H and ettringite phase through physical encapsulation, precipitation, adsorption or substitution mechanisms, and Pb is mainly solidified in C-S-H phase and absorbed in the Si-O structure. 相似文献
107.
The uterotrophic assay has been commonly used to test environmental estrogens in vivo, however, it is often not sensitive enough sometimes. An alternative way is to evaluate estrogenicity through biomarker genes. MicroRNA (miRNA) is a class of regulatory gene, which has been shown to be a good biomarker for many diseases and toxicological effects in recent years, and some evidences showed that estrogen induced response was partially mediated by miRNAs. In this study, two types of microarrays were used to test the 17[3-estradiol (E2) induced miRNA expression profile at different time points in the immature mouse uterus. Statistical analysis showed the aldehyde slide based array had less variation than the amino slide based array, and 11 dysregulated miRNAs were screened out for significant fold change. Real-time PCR was performed to further confirm that 4 out of 7 selected miRNAs, namely miR-451, miR-155, miR-335- 5p, and miR-365, are E2 regulated miRNAs in the uterus. The function of the predicted targets of these miRNAs is involved in cell grow control, which is consistent with the main E2 function in the uterus. MiR-451 had similar strong responses to E2 in the uterus of both immature and overiectomized mice, and could be a potential biomarker for estrogenicity in the uterus. 相似文献
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Ivan Holoubek Lea Houšková Zdenek Šeda Irena Holoubková Pavel Korínek Zbynek Bohácek 《毒物与环境化学》2013,95(2):73-83
The samples of soils, earthworms and vegetation (needles, lichens, mosses) were collected for the realization of Project TOCOEN (Toxic Organic Compounds in the ENvironment). The samples were collected from three TOCOEN model areas in Czechoslovakia—one city and two rural areas. The samples were analyzed for polycyclic aromatic hydrocarbons (PAHs), chlorinated pesticides (C1‐PEST) and polychlorinated biphenyls (PCBs). 相似文献