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eco risk
相关语句
  相似匹配句对
     Study on eco1ogical risk assessment
     生态风险评价研究
短句来源
     Elementary discussion of flood eco-environment risk management
     洪水生态环境风险管理浅议
短句来源
     Legend of ECO
     ECO传奇
短句来源
     Audit Risk
     审计风险
短句来源
     Eco Miyun
     生态密云
短句来源
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Based on the classification of urbanized land cover types of Shanghai Metropolitan area, which was significantly characterized with artificial buildings, infrastructures and disturbed semi-natural landscape, the potential impact of land use/cover changes was studied with autocorrelation analysis and fractal analysis, and the further conclusion was that with the rapid growth of urbanized landscape and drastic change of land cover, potential negative impact on urban air environment and eco-risk of...

Based on the classification of urbanized land cover types of Shanghai Metropolitan area, which was significantly characterized with artificial buildings, infrastructures and disturbed semi-natural landscape, the potential impact of land use/cover changes was studied with autocorrelation analysis and fractal analysis, and the further conclusion was that with the rapid growth of urbanized landscape and drastic change of land cover, potential negative impact on urban air environment and eco-risk of urban population would increase.

以上海市区为主的高强度开发地区为例,运用空间自相关分析和分维/分形分析方法,探讨了城市化土地利用/覆盖对区域空气环境安全水平的潜在影响,认为用地类型转变导致的土地覆盖的变化将降低区域空气环境的潜在安全水平并增加人类健康损失的潜在机率.

Based on the theory and methods of regional eco risk assessment (REA),the eco risk of forest resources in northeast China is evaluated. The stresses resulting in the eco risk of forest resources are physical,chemical,biological and social stresses. The weighed coefficient is 0.30,0.22,0.11 and 0.37,respectively. In 93 forest bureaus of this area,64.4% bureaus are in slight risk,21.2% in mid risk,13.3% in high risk and 1.1% in very high risk. This...

Based on the theory and methods of regional eco risk assessment (REA),the eco risk of forest resources in northeast China is evaluated. The stresses resulting in the eco risk of forest resources are physical,chemical,biological and social stresses. The weighed coefficient is 0.30,0.22,0.11 and 0.37,respectively. In 93 forest bureaus of this area,64.4% bureaus are in slight risk,21.2% in mid risk,13.3% in high risk and 1.1% in very high risk. This is in corresponding with the skew normal distribution. The eco risk of forest resourcs in northeast China is closely related to the locality of the resources. The risk becomes more and more serious from east to west. The risk management and restoration of the forest resource must be strengthened.

根据区域生态风险评价的理论和方法体系 ,对东北地区森林资源进行了生态风险评价 .东北林区生态风险问题形成的主要胁迫包括物理胁迫、化学胁迫、生物胁迫和社会胁迫 ,其权重系数分别为 0 .30、0 .2 2、0 .11和 0 .37.东北 93个林业局中 ,轻风险占 6 4 .4 % ,中风险占 2 1.2 % ,重风险占 13.3% ,严重风险占 1.1% ,符合偏正态分布 .东北区森林生态风险的地域分异明显 ,靠近长白山区的森林处于轻风险和中风险等级 ,向西生态风险越来越重 ,处于重风险和严重风险等级的林业局主要集中在小兴安岭地区 .必须加强东北区风险管理和森林景观的修复与重建

The levels of 8 heavy metals from 191 soil samples obtained from typical black soils in Northeast of China were analyzed in the present survey. The results showed that the concentrations of Cu, Zn, Cr and Hg in Hailun were higher than that in Gongzhuling and Beian, respectively. The concentrations of Pb showed an order: Gongzhuling>Hailun>Beian. The contents of the heavy metals in subsoil were lower than those in topsoil and varied according with them at different sampling areas. The levels of Cu, Zn, Cr and...

The levels of 8 heavy metals from 191 soil samples obtained from typical black soils in Northeast of China were analyzed in the present survey. The results showed that the concentrations of Cu, Zn, Cr and Hg in Hailun were higher than that in Gongzhuling and Beian, respectively. The concentrations of Pb showed an order: Gongzhuling>Hailun>Beian. The contents of the heavy metals in subsoil were lower than those in topsoil and varied according with them at different sampling areas. The levels of Cu, Zn, Cr and Hg in bean soil were higher than those in corn soil and fallow, respectively, while the order of Pb, Ni, As and Cd were: corn soil> bean soil> fallow. As a whole, the concentrations in the farmland were higher than in the fallow. In addition, Cu, Zn, As, Pb had the significant positive correlation with total phosphorus and the negative correlation with total potassium in Gongzhuling. The contamination caused by the heavy metals and the potential eco- risk of the regions ranked in the following order: Hailun> Gongzhuling> Beian. There was a light pollution in Hailun, potential pollution in Gongzhuling and the soil in Beian was cleaner than that in other two areas, while a severe environmental risk induced by Cd, As and Hg was found in three sampling areas.

选择典型黑土3个基本样区的191个土壤样品,探讨了8种重金属元素的分异状况。结果表明,不同重金属元素,整体上存在区域差异,表层中Cu、Zn、Cr、Hg均为海伦高于其他两地,Pb为公主岭>海伦>北安;亚表层含量略有降低,分异趋同于表层。不同利用黑土的方式Cu、Zn、Cr、Hg大豆土壤高于玉米和荒地,Pb、Ni、As、Cd基本呈现玉米>大豆>荒地,整体上荒地土壤重金属含量低于耕地。与土壤理化性质的关系主要体现在公主岭地区,Cu、Zn、Pb、As与全P、全K呈相反的显性相关趋势。重金属的环境污染及潜在生态风险均为海伦>公主岭>北安,海伦地区已构成轻度污染,公主岭存在较大的潜在污染,北安土壤相对较为清洁,Cd、As、Hg在3地区均存在较大的环境风险。

 
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