22 research outputs found

    马克思的劳动价值理论与现代服务价值理论述评

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    文章在对服务劳动是否创造价值的相关观点进行综述的基础上,分析了马克思的劳动价值论在服务领域的新发展,即现代服务价值理论,并就价值理论在国际服务贸易中的拓展进行肤浅的探讨

    丹江口水库浮游轮虫群落季节变动特征及其与环境因子的关系

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    为了解丹江口水库轮虫群落的季节变化及其与环境因子的关系,于2007年7月至2008年5月对丹江口水库轮虫群落及理化因子进行了周年调查.共检测到轮虫62种,隶属于12科23属,其中丹江库区30种,汉江库区54种.广布多肢轮虫(Polyarthra vulgaris)、螺形龟甲轮虫(Keratella cochlearis)、长圆疣毛轮虫(Synchaeta oblonga)、等刺异尾轮虫(Tri-chocerca similes)、冠饰异尾轮虫(Trichocerca lophoessa)、裂痕龟纹轮虫(

    三峡水库香溪河库湾夏季藻类水华的时空动态及其影响因素

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    2008年6—8月,三峡水库香溪河库湾相继暴发蓝藻和绿藻水华.依据香溪河库湾夏季的每周监测,对研究区2次水华分别进行聚类和判别分析,研究了2次水华的时空动态及其影响因素.结果表明:研究区2次水华过程均可划分为无水华组、过渡组和水华组;2次水华的暴发对可溶性硅(DSi)、硝态氮与亚硝态氮(NO3--N+NO2--N)和磷酸盐(PO43--P)3种营养盐的吸收程度不同;蓝藻水华暴发期间的DSi、总氮/总磷(TN/TP)、DSi/TN和DSi/TP值均低于绿藻水华;判别蓝藻水华暴发的参数为叶绿素a(Chla)

    丹江口水库生态系统健康综合评价

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    2007年7月~2008年5月按季度对丹江口水库4个库区(丹江库区、汉江库区、取水口和五青入库区)的水环境和浮游生物进行了调查,采用生态系统健康指数(EHI)法和营养状态指数(TSI)法对该水库的生态系统健康状态进行定量的综合评价.结果表明:2007年7月~2008年5月,丹江口水库整体处于中营养状态,健康状态中等,健康状态总趋势是丹江库区>取水口>汉江库区>五青入库区;各库区生态系统健康状态存在季节性差异,丹江库区、取水口两库区全年为中等,汉江库区在夏季为较差,其它季节中等,五青入库区在冬季最差,其它季节较差.此外,对两种评价方法进行了比较,表明丹江口水库属于响应型生态系统,生态系统健康指数(EHI)适用于丹江口水库生态系统健康的评价

    三峡水库香溪河库湾蓝藻水华生消过程初步研究

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    2008年6月三峡水库部分支流库湾第一次暴发大面积蓝藻水华,表明水库支流库湾生态环境已经恶化。以香溪河库湾为例,于2008年6月6日~7月25日,每间隔7天在库湾14个采样点采集水样一次,对蓝藻水华进行监测,研究蓝藻水华生消过程及其影响因素。结果表明,这次水华自2008年6月9日暴发,6月20日达到顶峰,7月11日结束,持续大约1个月;综合营养状态指数(TSI)与叶绿素a(Chl.α)所指示的水体营养状态,将同时满足TSI〉60与Chl.α〉20μg/L两个条件的区域边界视为蓝藻水华暴发的临界状态;整个水华暴发过程大致可分为两个阶段:6月9—25日和7月3—11日。水华暴发区域主要集中在距河口20~30km处相对稳定的库湾中上游区域,适宜的水动力条件是水华暴发的必要条件。此次水华的消落过程主要受到磷含量降低的限制以及氮磷比的影响,当氮磷比显著升高时,蓝藻的生长受到抑制。总氮总磷比在10—25之间比较适宜蓝藻的大量生长,因此限制磷元素的入库通量对于预防和控制库湾水华的暴发具有重要意义

    三峡水库香溪河库湾蓝藻水华生消过程初步研究

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    2008年6月三峡水库部分支流库湾第一次暴发大面积蓝藻水华,表明水库支流库湾生态环境已经恶化。以香溪河库湾为例,于2008年6月6日~7月25日,每间隔7天在库湾14个采样点采集水样一次,对蓝藻水华进行监测,研究蓝藻水华生消过程及其影响因素。结果表明,这次水华自2008年6月9日暴发,6月20日达到顶峰,7月11日结束,持续大约1个月;综合营养状态指数(TSI)与叶绿素a(Chl.a)所指示的水体营养状态,将同时满足TSI>60与Chl.a>20μg/L两个条件的区域边界视为蓝藻水华暴发的临界状态;整个

    洱海流域湖泊生态系统健康综合评价与比较

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    基于2009年5月对洱海及其流域内的海西海、茨碧湖和西湖3个小型湖泊的水环境和浮游生物的调查,采用生态系统健康指数(EHI)和营养状态指数(TSI)法对其生态系统健康状态进行定量综合评价.结果表明:洱海流域湖泊整体处于富营养状态,健康状态较差;各湖泊健康状态存在空间差异:海西海和茨碧湖生态系统健康状态为中等,西湖和洱海健康状态为较差;而洱海湖泊内健康状态同样存在空间差异,北部和中部深水区较其他区域健康状态好.2种评价方法比较表明:洱海流域湖泊属于营养盐和生物量基本上呈正相关的响应型生态系统,生态系统健康指数(EHI)适用于洱海流域的生态系统健康评价.此外,整理分析洱海浮游生物历史数据,同样采用EHI法评价得出近20年来洱海生态系统健康状态呈逐渐恶化趋势,尤其1997年健康状态最差

    Fischler spells out the fundamentals of CAP reform

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    Addressing the International Forum on Agriculture and Food in Cernobbio on October 25th 2003, Agriculture Commission Franz Fischler highlighted how through CAP reform the EU has 'chosen to increase the efficiency of direct payments'. He noted that this has 'improved the competitive position of EU farmers' and strengthened the EU's position in international negotiations. He maintained that the EU will continue to rein in trade-distorting aspects of its policy, and will continue to make its agricultural policy more market oriented and sustainable. However, the policy will still require continued support, albeit more efficiently and effectively targeted. Commissioner Fischler went on to review the background to the reform of the tobacco, olive and cotton regimes. He noted that the Commission was keenly aware of how production of these products was concentrated on holdings which are often located in areas which are lagging economically. This reality had been incorporated into the Commission's proposals for reform. Comment: Commissioner Fischler sees no contradiction between the increased price competitiveness of EU production which CAP reform will bring about and the needs of ACP countries to deepen agricultural processing so they can move up the value chain and reduce their dependence on basic commodity markets. Significantly the Commission in its approach to tobacco, olive and cotton-sector reform recognised that where production was concentrated in more disadvantaged regions special treatment would be required. This principle could usefully be applied to EU agricultural trade with ACP countries in the context of ongoing EPA negotiations.Addressing the International Forum on Agriculture and Food in..

    One man's watering hole

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    Mr Alade from the Animal Science Department of the University of Maiduguri in Nigeria wants more attention for his favourite topic. 'Every copy has interesting articles that address farmers problems through the use of modern and local methods of farming. However it is a pity that few articles are featured on livestock production. It is of little use to people engaged in animal production. Future editions should address this.' Don t stampede us, Mr Alede, but we get quite a lot of requests like this. In 2001, we had an opening article (Spore 94), six news items, five readers letters and 12 publications on livestock issues. Not enough, it seems, but we have to cover all sorts of topics for all sorts of aspects of farming and food. We shall try harder!Mr Alade from the Animal Science Department of the University of Maiduguri in Nigeria wants more attention for his favourite topic. 'Every copy has interesting articles that address farmers problems through the use of modern and local methods of..
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