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effect of eutrophication
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  “effect of eutrophication”译为未确定词的双语例句
     The Pollutional Ecological Effect of Eutrophication on the Aquatic Ecosystem
     富营养化对水生生态系统的污染生态效应
短句来源
     This article revealed the relation among the eutrophication, algae and POPs and discussed the effect of eutrophication on the distribution of POPs. It could be theoretics base of evaluation and forecast of POPs' congregation, diffusion, distribution and evolution process.
     把富营养化与藻类、藻类与POPs的关系协同起来,运用改进模型讨论了富营养化对POPs在多介质环境中分布的影响,为有效描述POPs在流域环境体系中的聚集、扩散、分布和演化性态,评价和预报提供了理论基础。
短句来源
  相似匹配句对
     butterfly effect
     蝴蝶效应
短句来源
     effect 17;
     有效17例;
     On the Effect of Radiators
     钢制板式散热器剖析
短句来源
     effect of registration;
     登记的效力问题 ;
短句来源
     Eutrophication and Control Approaches
     水质富营养化及其控制
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  effect of eutrophication
These differences were discussed and were found to be attributed to the effect of eutrophication and pollution on the growth, age and other biological aspects of O.
      
Studies on the effect of eutrophication on the ecology of shallow lakes, usually pay scant attention to changes within the epiphytic algal community, though the contribution of this to the ecosystem dynamics is transcendental.
      
Effect of eutrophication on changes in the composition of zooplankton in the Gro?nica Reservoir (Serbia, Yugoslavia)
      
Eight experimental ditch mesocosms were used to study the effect of eutrophication over four years.
      
Another eight ditches were used in a randomized experiment to study the effect of eutrophication.
      
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From Jan.1999 to Dec.2000, the phytoplankton communities of Hangzhou West Lake were investigated monthly for two years. Combined with the previous research data. The long-time ecological effect of eutrophication control measures such as damming, dredging, diluting etc. Used in the years 1980~2000 were analyzed. The results showed that the construction of the communities in most lake areas had unchanged with prior blue green algae, and the density of phytoplankton had increased 55.4% with blue green algae...

From Jan.1999 to Dec.2000, the phytoplankton communities of Hangzhou West Lake were investigated monthly for two years. Combined with the previous research data. The long-time ecological effect of eutrophication control measures such as damming, dredging, diluting etc. Used in the years 1980~2000 were analyzed. The results showed that the construction of the communities in most lake areas had unchanged with prior blue green algae, and the density of phytoplankton had increased 55.4% with blue green algae tending to scale down; while the lake eutrophication was still developing. One of the sub-lake, the Xiaonan lake area, after a series of control engineering had a large area of macrophytes, the transparency of the water was increased greatly and the density of algae was evidently decreased, and the water eutrophication character transformed gradually from phytoplankton type to macrophyte. Therefore, establishing and restoring the ecosystem mainly of macrophyte was the effective way to control the eutrophication of the West Lake.

1999年1月~2000年12月对杭州西湖浮游植物群落进行了为期2年的逐月调查.结合以前的研究资料,着重分析了20世纪80年代先后采取的截污、疏浚、引水冲污等一系列治理富营养化措施所产生的长期生态效应.结果表明,大部分湖区浮游植物群落结构与治理前基本相同,仍以蓝藻占绝对优势.1980~2000年,浮游植物密度增加了55.4%.蓝藻种类趋于小型化,20年来西湖的富营养化仍在发展.西湖子湖之一小南湖区经一系列工程治理后,出现了大面积的沉水植物,水体透明度大大提高,藻量明显下降,水体富营养特征逐渐从浮游植物响应型向大型高等水生植物响应型转化.因此,建立和恢复以沉水植物为主的生态系统,是治理西湖富营养化的有效途径.

Several studies have demonstrated the influence of submerged macrophytes on eutrophication or water quality with different results. To assess the effect of a submerged macrophyte, one should evaluate the ecosystem throughout a year in combination with the growth curve of the plant. The growth curve of Potamogeton crispus was determined from seven investigations from October 2002 to May 2003 in a reservoir with 70% of area covered by P. crispus. The effects of the grass on water quality were assessed by analyses...

Several studies have demonstrated the influence of submerged macrophytes on eutrophication or water quality with different results. To assess the effect of a submerged macrophyte, one should evaluate the ecosystem throughout a year in combination with the growth curve of the plant. The growth curve of Potamogeton crispus was determined from seven investigations from October 2002 to May 2003 in a reservoir with 70% of area covered by P. crispus. The effects of the grass on water quality were assessed by analyses of fluctuations in total phosphorus (TP), phytoplankton, and pH in the reservoir and in five other reservoirs with 0~30% of areas covered by P. crispus, Myriophyllum spicatum or a combination of both in July and October 2002, and March and May 2003. All six reservoirs are located in the Yellow River Delta (38° N, 118° E). The grass growth equation from October to May was regressed as GB=34.1×e~(0.018t) (p<0.002), where GB refers to the wet weight of grass per m~2, and t refers to days after germination. The equation from March to May was GB=25001+e~(14.97-0.08338t)(p<0.000). The fluctuations of TP, phytoplankton, and pH in six reservoirs exhibited (1) maximum TP in the reservoir dominated by P. crispus (RDP) occurred in March rather than October; (2) maximum cell abundance and maximum biomass of phytoplankton in RDP and the reservoirs with more than 25% of area covered by macrophytes occurred in October rather than in July; (3) of the values of phytoplankton in March, the RDP contained the highest biomass, dominated by diatoms; (4) annual average TP and cell abundance of phytoplankton in RDP did not differ significantly from the other five reservoirs; (5) annual average cell abundance of phytoplankton correlated significantly positive with TP (p<0.005) in all reservoirs, and annual average TP correlated significantly positive with chloride concentration (Cl) (p<0.005); (6) submerged macrophytes could stabilize pH and appreciably increased annual average pH; (7) in reservoirs except for the grassless and shallow one, phytoplankton cell abundance correlated significantly with zooplankton abundance. The result indicates that the submerged macrophyte P. crispus grows mainly from March to May when the temperature ranges from 7 to 25℃, with a maximum biomass of 2.5kg/m~2. Two species of submerged macrophytes in these reservoirs can only delay the platforms in the yearly curves of TP and abundance of phytoplankton while buffering the effect of eutrophication; they cannot control eutrophication because their decay or germination may increase pelagic nutrients in late autumn and early spring during diatom blooms. The trophic state is regulated by the concentration of TP. Excessive seasonal blooms of the grass can decrease the circulation of nutrients and reduce ecosystem productivity. Moreover, there is a risk that flourishing submerged macrophytes could increase pH so much that it might cause a change in ecosystem structure. To reduce the coverage of P. crispus in a reservoir by fish predation, both herbivorous fish and omnivorous fish should be used because of the high growth rate of the grass in spring.

通过连续对菹草生长过程的观测 ,用指数方程拟合了菹草从 10月中旬至第 2年 5月底的整个生长过程 (p<0 .0 0 2 ) ,设K=2 .5 kg/ m2时 ,用 L ogistic方程拟合了从 3月到 5月底的生长过程 (p<0 .0 0 0 )。通过 7月底至 8月初、10月、翌年 3月和 5月份对一个菹草型水库和无或有不同规模水草的 5座水库水生生物的周年调查发现 :(1)菹草型水库 TP最高峰的月份比其它水库的推迟 ,其它水库 10月份 TP最高 ,而菹草型水库 3月份最高 ;(2 )菹草型水库浮游植物最高峰的月份比无水草水库的推迟 ,无水草水库出现在夏季 (7~ 8月份 ) ,草型水库的出现在秋季 (10月份 ) ;(3)菹草型水库 3月份浮游植物生物量明显高于其它水库的 ,其硅藻占据更高的优势度 ;(4 )菹草型水库和其它水库之间的总磷和浮游植物数量的年平均值无明显差别 ;(5 )不同水库藻类数量年平均值与 TP年平均值相关极显著 (p<0 .0 0 5 ) ,而 TP又与氯化物 (Cl)相关极显著 (p<0 .0 0 5 ) ;(6 )水草的存在使p H略有提高 ,并使其在不同时间的波动幅度...

通过连续对菹草生长过程的观测 ,用指数方程拟合了菹草从 10月中旬至第 2年 5月底的整个生长过程 (p<0 .0 0 2 ) ,设K=2 .5 kg/ m2时 ,用 L ogistic方程拟合了从 3月到 5月底的生长过程 (p<0 .0 0 0 )。通过 7月底至 8月初、10月、翌年 3月和 5月份对一个菹草型水库和无或有不同规模水草的 5座水库水生生物的周年调查发现 :(1)菹草型水库 TP最高峰的月份比其它水库的推迟 ,其它水库 10月份 TP最高 ,而菹草型水库 3月份最高 ;(2 )菹草型水库浮游植物最高峰的月份比无水草水库的推迟 ,无水草水库出现在夏季 (7~ 8月份 ) ,草型水库的出现在秋季 (10月份 ) ;(3)菹草型水库 3月份浮游植物生物量明显高于其它水库的 ,其硅藻占据更高的优势度 ;(4 )菹草型水库和其它水库之间的总磷和浮游植物数量的年平均值无明显差别 ;(5 )不同水库藻类数量年平均值与 TP年平均值相关极显著 (p<0 .0 0 5 ) ,而 TP又与氯化物 (Cl)相关极显著 (p<0 .0 0 5 ) ;(6 )水草的存在使p H略有提高 ,并使其在不同时间的波动幅度减小

 
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