您要查找的是不是:
- land ecological risk 土地生态风险
- Management and Ecological Risk Assessment of Exotic Plants. 植物外来种的生态风险评估和管理
- Ecological risk of Bt transgenic cotton and its management strategy. 转Bt基因抗虫棉的生态风险及治理对策
- The main causes for the deterioration of land ecological security are unreasonable reclaimation、 denudation, overgrazing and the extensive farming. 滥垦、滥伐、过度放牧以及粗放经营的生产方式是导致该地区土地生态环境安全状况不断下降的主要原因。
- However, the study on the application of springtail in soil ecological risk assessment is very limited. 目前跳虫在土壤生态风险评价中的应用研究尚处于起步阶段。
- This topic investigated the Hui'an County land ecological environment present situation, has appraised the land utilization type to the ecological environment influence. 本课题调查了惠安县土地生态环境的现状,评价了土地利用类型对生态环境的影响。
- Heavy metal pollution in bottom sediment of abandoned Yellow River was assessed by using geo-accumulation index and potential ecological risk index. 潜在生态指数法评价结果表明,故黄河底泥内重金属污染对生态的潜在危害很轻。
- Its prevention is more effectual than treatment, and thus,the study of its ecological risk assessment could help us to prevent and reduce the invasion risk more effectively. 本文基于生态风险评价理论,通过对外来植物入侵特性和过程的分析,探讨了外来植物入侵生态风险的评价方法。
- The concept of land ecological safety is the land ecosystem of mankind ensure degree unaffected by ecological destroy and environment pollution in the production, living and health. 土地生态安全是指土地生态系统对人类在生产、生活和健康等方面不受生态破坏与环境污染等影响的保障程度。
- Riparian zones are the important transitional regions for exchange of substance, energy, and information between river ecological system and land ecological system, and have obvious marginal effect. 河岸带是河流生态系统与陆地生态系统进行物质、能量、信息交换的一个重要过渡带,具有明显的边缘效应。
- The potential ecological risk index (RI) and geological acumination index(Igeo), as the quantitative diagnostic tools, were used to evaluate the pollution degree of various heavy metals in the sediments. 利用潜在生态风险指数(RI)和地质积累指数(Igeo)两种指标相结合的方法对表层底泥中重金属污染程度进行评价.
- The concentration of HCHs was 0.04~2.30ng/g and the concentration of DDTs was 0.07~4.56ng/g. The organochlorine pesticides in sediments of Hainan Dongzhai harbor was in the state of low ecological risk. HCHs浓度为0.;04~2
- Based the research about ecological risk theory,the model of EVR has been established with use of VaR which is a very popular risk management model in international market. EVR is a new and useful risk management in regional ecosystem. 结合当前国际上流行的 Va R风险管理模型 ;在生态风险理论有关研究的基础上 ;建立了一类新颖而实用的区域生态系统风险管理模型 - EVR.
- Based on clarifying of land ecological security and taking Hebei Province as the case, this article discusses the methods of security evaluations of land ecology. 以河北省为例,在界定土地生态安全概念的基础上,探讨了土地生态安全评价的方法。
- Potential ecological risk (PER) factors (Eri=Tri Cfi) and risk indicesof heavy metals were used for assessing the PER of metals to marineecosystem in the water area of the Daya Bay. 采用金属潜在生态危害系数和危害指数的评估方法,评价了大亚湾海域重金属对海洋生态系统的潜在危害。
- This paper discusses the content of ecological risk and gives a definition to it: ecological risk is the probability of bad happenings caused by the ecological factors and the degrees of the outcomes. 本文探讨了生态风险的内涵,定义了生态系统的风险:生态系统的风险是其生态因子所导致的不良事件发生的概率及其后果的严重程度。
- In the end of this review, problems existing in and prospects of the application of Collembola in the ecological risk assessment of heavy metal contamination of soils are analyzed and discussed. 最后对弹尾目昆虫在重金属污染土壤生态风险评估应用中目前存在的一些问题和应用前景进行了分析讨论。
- However,a series of land ecologically maladjusted problems have emerged because of the massive lop and unreasonable utilization of land in recent decades. 在分析该区脆弱山地生态基础上,探讨了土地环境的现状和演变。
- In accordance with the commonly accepted index of security evaluation on regional land ecology, a system of 22 indexes suitable for this region is established. 依据区域土地生态安全评价一般性指标体系,建立了适合该区的由22项指标组成的土地生态安全评价指标体系。
- Quantitative structure-activity relationship (QSAR) of organic pollutants is of great importance to ecological risk assessments of organic compounds, pollution control and pollution prevention, etc. 有机污染物定量结构-活性相关(QSAR)对于有机化合物的生态风险性评价、污染控制和预防等具有重要意义。