关键词: 血凝性脑脊髓炎病毒, 血凝性脑脊髓炎病毒, 血清学调查, 猪

Abstract:

Abstrac:【OBJECTIVE】It is one of the most widely area and damaging environmental problems about soil heavy metal pollution in current. So, it is wide spread concern, and received general attention. A number of assessment methods of heavy metal pollution in soil have proposed at home and abroad, and which had analyzed and made a conclusion by author. Which would lay a foundation for assessment of heavy metal pollution in soil.【METHOD】The single factor index, nemerow index method, comprehensive evaluation mode of geometric mean, pollution load index, index of geo-accumulation, the potential ecological risk index, sediment enrichment factor, potential ecological eisk index, fuzzy mathematical method, grey clustering method, geostatistics method on GIS, method for health risk assessment, method of environment risk index, and so on typical soil heavy metal pollution assessment methods and models in domestic and foreign were summarized. The advantages, disadvantage and application range of those methods were analyzed.【CONCLUSION】It is indicated by the comparison analysis that a variety of evaluation methods have certain limitations and inadequacies. It was necessary for select on better evaluation methods to carry out full analysis of the sample points, comparison of trial and error with the purpose of evaluation and focus on in pollution assessment of soil heavy metals. Finally, combining a variety of methods according to the actual situation were put forward. At the same time，it should start from the ecological effects of heavy metal pollution, development of biological evaluation method.