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941.
浅谈加强环境现场监测规范化建设 总被引:2,自引:0,他引:2
尹卫萍 《环境监测管理与技术》2013,25(2):1-3
分析了环境现场监测存在的质控体系不够完善,监测人员不够专业,监测技术相对落后,管理制度不够健全等问题.提出实现环境现场监测规范化建设,应从完善现场监测质量控制体系入手,加强监测队伍、监测装备、现场监测管理制度建设,改进和提高现场监测技术,以此满足和适应环保新形势对环境现场监测工作的要求. 相似文献
942.
E. P. Gus'kov T. V. Varduni T. P. Shkurat N. P. Milyutina A. V. Mirzoyan 《Russian Journal of Ecology》2000,31(4):245-250
A new method for estimating the genotoxicity of the urban environment is proposed. The method is based on the analysis of
the lipid peroxidation (LPO) rate in leaves of woody plants. The mutagenicity of the urban environment was estimated using
standard test systems, including plant root meristem (kidney beans germinated in water with suspended particles collected
at different points along the Temernik River) and the Ames test (silt samples were tested). Sensitivities of elm, willow,
and poplar leaf meristem cells to unidentified environmental mutagenes were compared. Frequencies of chromosome aberrations
(CAs) in leaves of woody plants growing at different points along the Temernik River within the Rostov-on-Don city districts
differed from those in the control zone. The frequency of CAs was found to correlate with the concentration of LPO products.
This allows a biochemical estimation of the malonic dialdehyde (MDA) concentration in woody plants to be used as an express
test for the mutagenicity of environmental factors. An advantage of the proposed test is the possibility of monitoring the
level of unidentified environmental mutagens over many years, independently of its sporadic temporal variations. 相似文献
943.
944.
利用2013年佛山市8个国控大气自动监测站点ρ(PM_(2.5))监测数据,分析佛山市PM_(2.5)污染的时空分布特征,并诊断诱发PM_(2.5)高污染过程的关键天气类型。结果表明,佛山市2013年PM_(2.5)年均值为53μg/m3,高于国家二级标准,污染主要集中在三水区中部、南海区中部和禅城区北部。佛山市ρ(PM_(2.5))表现出明显的季节变化和日变化特征,秋、冬季是PM_(2.5)的高污染季节,其值夜间略高于白天,呈典型的双峰型分布,08:00—09:00短暂出现一个浓度的小峰值,推测与上班交通高峰有关。对PM_(2.5)持续高污染发生的地面天气形势分析表明,高压出海是诱发佛山市PM_(2.5)高污染事件最主要的天气类型。 相似文献
945.
Real-world fuel consumption of light-duty passenger vehicles using on-board diagnostic (OBD) systems
Xuan Zheng Sheng Lu Liuhanzi Yang Min Yan Guangyi Xu Xiaomeng Wu Lixin Fu Ye Wu 《Frontiers of Environmental Science & Engineering》2020,14(2):33
946.
947.
Reconnecting Cities to the Biosphere: Stewardship of Green Infrastructure and Urban Ecosystem Services 总被引:2,自引:0,他引:2
Erik Andersson Stephan Barthel Sara Borgström Johan Colding Thomas Elmqvist Carl Folke Åsa Gren 《Ambio》2014,43(4):445-453
Within-city green infrastructure can offer opportunities and new contexts for people to become stewards of ecosystem services. We analyze cities as social–ecological systems, synthesize the literature, and provide examples from more than 15 years of research in the Stockholm urban region, Sweden. The social–ecological approach spans from investigating ecosystem properties to the social frameworks and personal values that drive and shape human interactions with nature. Key findings demonstrate that urban ecosystem services are generated by social–ecological systems and that local stewards are critically important. However, land-use planning and management seldom account for their role in the generation of urban ecosystem services. While the small scale patchwork of land uses in cities stimulates intense interactions across borders much focus is still on individual patches. The results highlight the importance and complexity of stewardship of urban biodiversity and ecosystem services and of the planning and governance of urban green infrastructure. 相似文献
948.
China’s government is now promoting the Nomad Sedentarization Project (NSP) in large areas of grassland as a solution for ecological restoration and poverty alleviation. To examine the effects of this policy, we conducted in-depth interviews at two of the project’s sites and examined the social and ecological systems at village, county, and catchment scales in Jinghe County of Xinjiang. We found that (1) the NSP in one village greatly improved the household standard of living and changed their resource utilization modes; (2) the success in this village can be attributed to resources imported from the social and ecological systems at larger scales, and could not be repeated in a second nearby village with different constraints; and (3) the NSP is poorly adapted to local ecosystem characteristics, and may therefore have negative impacts at larger scales. To avoid these problems, holistic assessments are necessary to judge the NSP’s impacts on social and ecological systems at multiple scales, and the program must be implemented cautiously to account for the potential risks in ecologically vulnerable areas. 相似文献
949.
Fabrício Garcia Giori Valdemar Luiz Tornisielo Carlos Eduardo Pellegrino Cerri Jussara Borges Regitano 《Journal of environmental science and health. Part. B》2013,48(5):352-360
This research evaluated the effects of the new sugarcane harvesting system (without straw burning) and soil attributes on the organic carbon (OC) accumulation and sorption of alachlor (2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide) and diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) in highly weathered Brazilian soils. Alachlor was more likely to leach (K d,app = 1.0–7.0 L kg?1 and mean K oc,app = 174 L kg?1) than diuron (K d,app = 6.2–116.3 L kg?1 and mean K oc,app = 1789 L kg?1). The sorption coefficient (K d,app) values correlated better with soil OC contents, but the Fe-oxides also played an important role in these highly weathered soils. Sorption was enhanced in the areas without straw burning mostly due to OC accumulation that was higher in the clayey soils, but it was not enough to change their mobility classification. 相似文献
950.
合流制排水系统降雨径流初期冲刷效应 总被引:1,自引:0,他引:1
通过对昆明主城区3个集水区合流制排水系统10次降雨径流过程水质水量的监测,计算了污染物的次降雨平均浓度(EMC),并采用无因次累积负荷体积分数曲线(M(V)曲线)和初期冲刷系数方法对初期冲刷现象进行了探讨。结果表明:(1)对于同一个常规污染指标,不同集水区的EMC平均值没有较明显差异,但都表现出较高浓度的污染特征。不同集水区总悬浮颗粒物(TSS)、COD、TN和TP的EMC平均值分别为140.18~174.11、144.65~161.78、21.44~23.18、1.80~2.35mg/L。(2)3个集水区所有观测降雨事件中,TP、TN、COD和TSS的初期30%径流量所对应的污染物累积负荷量(FF30)平均值分别为38.7%、37.1%、40.7%、44.6%;TSS和COD的初期冲刷强度明显较TP和TN变化更剧烈,不同污染物初期冲刷强度依次为TSSCODTPTN。(3)对于合流制排水系统,在区域特征相近情况下,汇水面积越小则初期冲刷效应越显著。而当汇水面积大到一定程度时,不同集水区之间初期冲刷强度没有显著差异。(4)降雨量、平均雨强和最大雨强与合流制排水系统的初期冲刷强度呈显著的正相关性,是影响其初期冲刷的重要水文参数;降雨历时和前期晴天与其初期冲刷强度没有显著相关性,两者对初期冲刷无明显影响。 相似文献