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81.
Visible light responsive N-F-codoped TiO2 photocatalysts exhibit a higher catalytic activity than N-doped TiO2 for the degradation of 4-chlorophenol due to the synergistic effect of nonmetal elements. 相似文献
82.
83.
A restoration-promoting integrated floating bed and its experimental performance in eutrophication remediation 总被引:5,自引:0,他引:5
Yiming Guo Yunguo Liu Guangming Zeng Xinjiang Hu Xin Li Dawei Huang Yunqin Liu Yicheng Yin 《环境科学学报(英文版)》2014,26(5):1090-1098
Numerous studies on eutrophication remediation have mainly focused on purifying water first, then restoring submerged macrophytes. A restoration-promoting integrated floating bed (RPIFB) was designed to combine the processes of water purification and macrophyte restoration simultaneously. Two outdoor experiments were conducted to evaluate the ecological functions of the RP1FB. Trial 1 was conducted to compare the eutrophication purification among floating bed, gradual-submerging bed (GSB) and RPIFB technologies. The results illustrated that RPIFB has the best purification capacity. Removal efficiencies of RPIFB for TN, TP,NH4+-N, NO3-N, CODcr, Chlorophyll-a and turbidity were 74.45%, 98.31%, 74.71%, 88.81%, 71.42%, 90.17% and 85%, respectively. In trial 2, influences of depth of GSB and photic area in RPIFB on biota were investigated. When the depth of GSB decreased and the photic area of RPIFB grew, the height of Potamogeton crispus Linn. increased, but the biomass of Canna indica Linn. was reduced. The mortalities of Misgurnus anguillicaudatus and Bellamya aeruginosa in each group were all less than 7%. All results indicated that when the RPIFB was embedded into the eutrophic water, the regime shift from phytoplankton-dominated to macrophyte-dominated state could be promoted. Thus, the RPIFB is a promising remediation technology for eutrophication and submerged macrophyte restoration. 相似文献
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85.
采用综合污染指数法对锦州市农村两家畜禽养殖场区周边土壤监测数据进行评估,分析了畜禽粪便对畜禽养殖场周边土壤中重金属污染的影响。 相似文献
86.
2015年干季佛山一次重空气污染过程形成机理研究 总被引:1,自引:0,他引:1
2015年12月21-23日,广东珠三角佛山地区出现了一次PM2.5重污染过程.利用佛山地区顺德、禅城、三水3个站点风廓线雷达、激光雷达和微波辐射计观测资料,结合地面气象观测数据和污染物浓度数据,分析研究了这次重污染过程的形成机理.结果表明:1形成这次污染过程的主要原因是近地层偏南风和偏北风对峙导致水平风速减小,大气水平输送能力变差;持续时间长且强度达到3℃·km-1的强逆温抑制了污染物的垂直扩散;800 m以下超过90%的高相对湿度造成气溶胶粒子吸湿增长显著.2持续时间长且比较深厚的小风层是造成这次污染过程的直接原因,小风层厚度是预报空气质量变化的较好工具.与地面风速相比,PM2.5浓度与小风层厚度的相关系数最多能提高0.36,且具有较长的预报时效.佛山地区小风层的风速阈值为3.8 m·s-1.3这次污染过程存在两种不同的污染形成机制,污染前期(21-23日中午)主要以本地污染物累积为主,污染后期(23日下午)下风向地区(三水)的污染主要是受上风向地区(顺德和禅城)的污染输送影响. 相似文献
87.
Assessing China’s Ecological Restoration Programs: What’s Been Done and What Remains to Be Done? 总被引:3,自引:0,他引:3
This article surveys the recent literature that has assessed China’s ecological restoration programs, including the Sloping
Land Conversion Program (SLCP) and the Natural Forest Protection Program (NFPP). Our presumption is that the performance of
these programs should be determined by their effectiveness of implementation and significance of impact. Implementation effectiveness
can be measured with such indicators as land area converted or conserved, and survival and stocking rates of restored vegetation,
while impact significance can be gauged by the induced changes in ecosystem functionality and stability (erosion control,
biodiversity protection, etc.) and socioeconomic conditions. Coupling this matrix with an exhaustive search of the publications,
we find that: (1) the implementation effectiveness has not been examined as extensively as the impact significance; (2) efforts
to assess the impact significance have concentrated on the SLCP, particularly its socioeconomic effects: growth of income,
alternative industry, and employment, and likelihood of re-conversion; and (3) most of the socioeconomic studies are based
on rural household surveys and discrete choice and difference in differences models. While much has been learned from previous
studies, a lot more needs to be done in improving our understanding of the program execution and impacts. Future work should
pay more attention to the NFPP and other programs, and the environmental impacts and the implementation effectiveness of all
of them. To these ends, analysts must gather more field data regarding the evolving ecosystem conditions and socioeconomic
information of higher aggregation, and conduct their research across scales and disciplines, with better application of geospatial
technology and more effective modeling. 相似文献
88.
地震是自然灾害之首,仅“5·12”汶川特大地震瞬间就夺去了近9万同胞的生命,伤亡总数近40万人,直接经济损失达1万多亿元人民币。 相似文献
89.
A highly resolved temporal and spatial air pollutant emission inventory for the Pearl River Delta region, China and its uncertainty assessment 总被引:31,自引:0,他引:31
Junyu Zheng Lijun Zhang Wenwei Che Zhuoyun Zheng Shasha Yin 《Atmospheric environment (Oxford, England : 1994)》2009,43(32):5112-5122
A highly resolved temporal and spatial Pearl River Delta (PRD) regional emission inventory for the year 2006 was developed with the use of best available domestic emission factors and activity data. The inventory covers major emission sources in the region and a bottom–up approach was adopted to compile the inventory for those sources where possible. The results show that the estimates for SO2, NOx, CO, PM10, PM2.5 and VOC emissions in the PRD region for the year 2006 are 711.4 kt, 891.9 kt, 3840.6 kt, 418.4 kt, 204.6 kt, and 1180.1 kt, respectively. About 91.4% of SO2 emissions were from power plant and industrial sources, and 87.2% of NOx emissions were from power plant and mobile sources. The industrial, mobile and power plant sources are major contributors to PM10 and PM2.5 emissions, accounting for 97.7% of the total PM10 and 97.2% of PM2.5 emissions, respectively. Mobile, biogenic and VOC product-related sources are responsible for 90.5% of the total VOC emissions. The emissions are spatially allocated onto grid cells with a resolution of 3 km × 3 km, showing that anthropogenic air pollutant emissions are mainly distributed over PRD central-southern city cluster areas. The preliminary temporal profiles were established for the power plant, industrial and on-road mobile sources. There is relatively low uncertainty in SO2 emission estimates with a range of −16% to +21% from power plant sources, medium to high uncertainty for the NOx emissions, and high uncertainties in the VOC, PM2.5, PM10 and CO emissions. 相似文献
90.