Studies on polycyclic aromatic hydrocarbons in two sediment cores from the huaxi reservoir,china: Assessment of levels,sources, and ecological risk

This study investigated the levels, sources and ecological risks of 16 polycyclic aromatic hydrocarbons (PAHs) in two sediment cores that were collected along the Huaxi Reservoir. The spatial distributions and residue levels of the 16 priority PAHs in the sediments from the Huaxi Reservoir were analyzed for their potential ecological risk, source apportionment and contribution to the total PAH residue. The concentration level of the total PAHs (TPAHs) was in the range 1805 ng·g^?1 to 20023 ng·g^?1 based on dry weight, and the content of PAHs in the Huaxi Reservoir exhibited a gradual upward trend. The PAH congener ratios fluoranthene/(fluoranthene + pyrene) and indeno[1, 2, 3-cd]pyrene/(indeno[1, 2, 3-cd]pyrene + benzo[g, h, i]perylene) were used to identify the source. The main source of the low molecular weight PAHs was wood and coal combustion, whereas the high molecular weight PAHs were primarily from petroleum combustion sources. The results of an ecological risk assessment demonstrated that ACE poses a potential ecological risk, while FLU, NAP, ANT, BaP, DBA, PHEN and PYR can have serious ecological risks.     

The regulatory role of endogenous iron on greenhouse gas emissions under intensive nitrogen fertilization in subtropical soils of China

Environmental Science and Pollution Research - Anaerobic batch experiments were conducted to study the regulatory role of endogenous iron in greenhouse gas emissions under intensive nitrogen...     

溶胶凝胶法制备磷钨酸掺杂TiO2薄膜及其光催化性能

以钛酸四丁酯为前驱物,采用溶胶凝胶法制备了磷钨酸掺杂的二氧化钛薄膜.通过XRD、FT-TR对该薄膜进行了表征,研究了薄膜在对氯苯酚光降解中的催化活性.结果表明,当磷钨酸与二氧化钛摩尔比为0.01:1、薄膜烧结温度600℃、对氯苯酚溶液浓度30 mg/L(pH＝5)、光催化8 h的条件下,对氯苯酚的降解率超过90%,且薄膜可以重复使用.磷钨酸对二氧化钛的光催化活性具有明显的促进作用.     

跨行政区域水污染纠纷的对策探讨——剖析某水域水污染死鱼事故

针对某乡镇企业十分发达地区的跨行政(市县)区域水污染死鱼事故的剖析，本文提出了处理解决跨行政区域水污染纠纷事故的若干对策建议。     

我国人口资源与食物问题

人口增多,耕地减少,部分地区供水不足,是我国人口与资源矛盾的基本格局。由于人口的压力,对资源实行超强度的利用,使较大范围的地区生态环境恶化,严重威胁农业生产,并成为许多地区多灾、低产、贫困的根本原因,较低的食物人均占有水平,将继续成为中国国民经济发展和人民生活水平提高的严重限制因素。增加食物,必须挖掘资源的潜力,开源与节流相结合,以内涵挖潜为主。首先是要立足现有的耕地,致力于提高单产;同时,合理开发水域、山地、草地等资源,广辟食物来源,提高非耕地资源的生产力,提高林牧渔业的发展水平。耕地应以深度开发为主,走资源节约型(节地、节水、节时、节能)的集约化道路。     

Effect of Habitat Fragmentation and Isolation on the Population of Alpine Musk Deer

The alpine musk deer (Moschus chrysogaster) is a key species of some terrestrial ecosystems, it has an important economic and conservative significance as a kind of medical animal in China. Due to the interaction between natural forces and human disturbance, the habitats of alpine musk deer are fragmented and isolated in different mountains and the populations are confronted with many problems of survival. In this paper, we discuss the impact of habitat fragmentation and isolation on alpine musk deer populations based on the investigation on the population densities and sizes and environmental factors in different reserves, as well as on the analysis of its ecological adaptability. We found that the alpine musk deer has strong ecological adaptability; the population development of alpine musk deer may benefit from the reduction of the forest area and even from the fragmentation and isolation of the habitat to a certain extent. However, deforestion should not be encouraged only for the alpine musk deer population, but should also be based on the overall consideration of biodiversity conservation.     

大城市的城市化发展战略和途径研究--以南京市为例

城市化从本质上是一种经济社会结构变动过程，南京市作为长江三角洲的副中心城市和江苏省省会，需要认真研究在经济全球化背景下，如何加快推进城市化进程，发挥中心城市功能，促进城市现代化和可持续发展。城市化水平的提高、大城市中心功能的加强、较为明显的城乡二元结构是南京市城市化过程中的基本特征。南京城市化的发展遇到了前所未有的机遇，江苏省已经提出了大力规划建设以南京市为中心的都市圈，并在2001、2002连续2年扩张南京市区的范围，大大加强了南京市的综合实力。南京的城市化发展主要途径在于提升城市功能，奠定城市化的经济基础；以城市空间优化为支点，以基础设施建设为引导，提高城市现代化水平；增强中心城市辐射功能．带动城乡一体的发展。推进南京城市化的进程还必须要制定一些政策和措施傲保证，如加快户籍制度和土地制度的改革、加大投资融资的力度、制定各类切实可行的规划等等。     

预曝-混凝沉淀-微絮凝过滤工艺处理钢帘线污水

采用预曝-混凝沉淀-微絮凝过滤工艺处理子午轮胎钢帘线厂废水,并循环回用.经过3年运行结果表明,出水水质符合<污水再生利用设计规范>(GB50335-2002)中循环冷却水水质控制指标,并达到车间生产用水要求.该工艺运行稳定,管理方便,完全实现零排放.     

模糊综合评价法在矿区塌陷土地复垦潜力评估中的应用

为了合理利用土地、提高土地生产率、改善矿区及其周围的生态环境，对矿区塌陷土地复垦潜力进行了研究。阐述了模糊综合评价法的基本原理，并以南票矿区为例，选择了塌陷土地复垦潜力评价的二层树状结构因子，确定了隶属度函数、评价指标权重和评价集，得出了塌陷土地复垦潜力的评价结果。为其他矿区塌陷土地复垦潜力评价提供了理论依据。     

邢台市秋季PM2.5及水溶性离子污染特征

为研究邢台市秋季PM_2.5污染特征,于2017年10月15日~11月14日在邢台市区对PM_2.5样品进行了采集,并对其中水溶性离子（包括Cl^-、NO₃^-、SO₄^2-、NH₄⁺、Ca²⁺、Na⁺、Mg²⁺、K⁺）进行了分析.结果显示,观测期间邢台市ρ（PM_2.5）平均值为（130.0±74.9）μg/m³,其中水溶性离子质量浓度为（69.8±11.4）μg/m³,占ρ（PM_2.5）的53.3%,NO₃^-、SO₄^2-和NH₄⁺为主要离子,占水溶性离子比例达到了89.7%. 当污染加重,水溶性离子质量浓度随ρ（PM_2.5）增大而升高,且NO₃^-、NH₄⁺及SO₄^2-占比亦逐渐升高,但其他离子占比随之下降,Ca²⁺尤为明显,表明ρ（PM_2.5）升高时主要受二次无机转化影响;观测期间SOR（硫转化率）与NOR（氮转化率）的平均值分别为0.36和0.25,表明秋季SO₂与NO₂转化速率较强,二次无机污染严重,另外SOR及NOR与温度及相对湿度呈正相关,且SOR对二者更为敏感;邢台市秋季PM_2.5呈弱碱性,NH₄⁺主要以（NH₄）₂SO₄和NH₄NO₃的形式存在;ρ（NO₃^-）/ρ（SO₄^2-）平均值为2.13,表明移动源对秋季大气颗粒物的来源贡献较大;PMF分析结果表明,二次转化源、燃烧源及扬尘源为邢台市秋季PM_2.5中水溶性离子的主要来源.