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以前年份
相关语句
  相似匹配句对
     Long Ago
     多年以前
短句来源
     Forecasting the Particular Years of Severe Calamities
     重灾年份预测
短句来源
     Textual Research on Medical Records Prior to the Song Dynasty
     宋以前医案考
短句来源
     there is a more and more drought trend,it is to say that in general,water-logging was frequent before 1980 except in few years;
     总的旱涝趋势是越来越旱,1980年以前偏涝,间或有旱的年份出现;
短句来源
     Before 2000, there were much smaller fire areas in the majority areas of Zhejiang Province in most of years, and wildwood suffered less destruction.
     2000年以前,全省大部分地区大多数年份过火面积较小,天然林受森林火灾的破坏程度较轻;
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The scare of fresh water has been becoming a focus issue in the world, while water quality deterioration enhances the seriousness of the problem. To assess the water quality and its impact factors can provide basic information for water resource management. This paper verified the usefulness of water quality indices (WQI) to assess the water quality from multiple measured parameters, and to evaluate the spatial and temporal change. The WQI which takes into consideration all the measured parameters not only shows...

The scare of fresh water has been becoming a focus issue in the world, while water quality deterioration enhances the seriousness of the problem. To assess the water quality and its impact factors can provide basic information for water resource management. This paper verified the usefulness of water quality indices (WQI) to assess the water quality from multiple measured parameters, and to evaluate the spatial and temporal change. The WQI which takes into consideration all the measured parameters not only shows a similar trend to the results of analyzing separate parameters and the index of compositive pollution, but also display the overall water quality and can predict precisely the change trend of water quality. As a case study, we use the WQI to evaluate spatial and temporal changes in the water quality from Xitiaoxi Catchment, upper reaches of Taihu Basin, and assess the degree of factors influencing water quality. The nonpoint source pollution caused by land use produces a serious and negative effect on the water quality because only controlling and management point sources only increase 6.5% of water quality. The water quality gradually deteriorated along the river from upper reaches to lower reaches mainly due to the land use change. So, in the future, the highest priority measure to improve water quality of Xitiaoxi Catchment should be controlling non-point pollution resources.

水资源短缺是全球性关注的问题水质恶化更加剧了这一问题的严重性定量研究水质变化及其影响因素可为治理水环境提供基础依据. 与实测数据及综合污染指数的对比表明水质指数能够合理反映水质的变化程度和时空变化趋势. 利用西苕溪流域1996-2000年水质监测数据的研究结果如下西苕溪流域水质的空间变化趋势是自上游至下游逐渐恶化时间变化的总体趋势是逐年转好点污染源得到有效控制年份1999年的水质指数比以前年份1996-1998年有所提高但幅度不大说明非点源污染是影响西苕溪流域水质的重要因素流域水污染的主要形式是氮磷污染其主要非点源是农田经济竹林和城镇径流及居民生活污水等.

By analysing meteorological data in 1956-2005,we finds that in the period of wheat earing flowering,approximately 7 tenths yearsthe suitable warm and wet weather appearanced.Moreover in recently 20 years,the frequency of the weather is increasing obviously.So we should strengthen preventing and controlling and we proposes the corresponding countermeasure.

对六安市1956-2005年50年气象资料进行了分析,结果表明,在小麦抽穗扬花期近70%的年份出现了适宜赤霉病流行的暖湿气象条件,而且近20年与以前年份相比,出现的频率明显增加,因此应加大防治力度,并由此提出防治对策及建议。

 
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