【摘 要】
：
Guiyang is located in southwestern China,which is a famous tourism city,and is awarded the title of “the Summer Capital of China”.A study on heavy metals in G
【机 构】
：
School of Geographic and Environmental Sciences
【基金项目】
：
This research project is supported by National Natural Science Foundation of China;the Science and Technology Department of Guizhou Province;the Science Foundation of the Guizhou Province,China
论文部分内容阅读
Guiyang is located in southwestern China,which is a famous tourism city,and is awarded the title of “the Summer Capital of China”.A study on heavy metals in Guiyang urban soils was conducted.The results showed that the concentrations of Cd,Cu,Ni,Pb and Zn in Guiyang urban soils are significantly higher than their background values and Cu,Zn and Pb in Guiyang soils are accumulated seriously.The distribution characteristics of heavy metals in 3 districts are described as follows:the level of heavy metals in soils follows the order of Nanming District＞Yunyan District ＞Xiaohe District.The spatial distribution of metals in urban soils of Guiyang shows that the level of metals in the central and eastern parts of Guiyang is relatively high,and its characteristics are attributed to the influence of commercial activities,heavy traffic and industrial emission.Compared with some other cities in China,Guiyang is characterized by relatively high accumulation level of Cd,Cu,and Zn in its soils.
其他文献
本文分析了对居民住宅区当中的环境质量进行提高时应坚持的理念,以及提高居民住宅区环境质量的总体框架与目标,并简单探讨了提高居民住宅区当中环境质量的措施.
Firstly several aspects of the strategic cooperation between China Post and Telecoms are described in succession, which includes the necessity, the probability,
Revegetation of disturbed land,particularly in arid environment,is often hindered by low seedling establishment.Information on seed biology and germination cues
阐述了综合机械化和电气自动化技术在煤矿开采上的应用,利用自动化控制技术,发挥机电一体化作用,建设高产高效矿井,对实现高产高技现代化煤矿具有重大意义.
目的 总结保存治疗纵折牙治疗的临床经验.方法 对上颌第一磨牙的纵折牙进行完善的根管治疗后,采用根管桩钉固位,固化树脂充填,并及时全冠修复.结果 纵折牙经妥善根管治疗,和
新课程理念下的形成性评价重视学习的过程，重视学生在学习中的体验；强调人与人之间的相互作用，强调评价中多种因素的交互作用；重视师生间的交流。采用“英语之星”的形成性评价方
目的 研究口气中挥发性硫化物(VSC)与牙周临床指标及舌苔的相关性.方法 采用鼻闻法评定口臭值(OS),筛选出口臭值≥2,全身健康牙周炎患者50例.使用便携式气相色谱仪(Oral Chr
钟声亦浊亦清，看世上人，如何听取；鼓点能轻能重，问楼头客，怎样击来？
水痘发病以冬春季为主,主要感染儿童。多发于从未感染过此病毒、对之无免疫力的易感人群,得过水痘的人则会终生免疫。水痘潜伏期约14天。水痘起病时可能出现发热,咽痛,全身不