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dredging treatment
相关语句
  疏浚
     Evaluate on Lake Xihu,Hangzhou Eutrophication after Dredging Treatment
     疏浚后杭州西湖富营养化评价
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  “dredging treatment”译为未确定词的双语例句
     The results showed that annual average value of TLIc declined clear in Station Ⅰand Station Ⅳ,declined little in Station Ⅱ and Station Ⅲ after dredging treatment.
     结果表明,Ⅰ站和Ⅳ站综合营养状态指数年平均值下降幅度较大,Ⅱ站和Ⅲ站TLIc年平均值下降幅度较小。
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  相似匹配句对
     L. P. treatment.
     L. P.
短句来源
     Dredging and After-treatment of Deposits Contaminated by Minerals
     矿质污染沉积物疏浚及后续处理问题的探讨
短句来源
     Experimental Research on Residual Water Treatment for Environmental Dredging
     环保疏浚余水处理试验研究
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     treatment with mecamylamine;
     随机分为4组,对照组、阿托品组、美加明组和阿托品与美加明联用组。
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     3.Optimum dredging.
     3.优化疏浚;
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The long-term changes of zooplankton, including in species composition, abundance and regression analysis between biomass and water environment have been studied at three sampling stations (fromⅠ to Ⅲ) of Lake Xihu (West Lake), Hangzhou, a shallow eutrophic lake treated by water pumping and dredging. StationⅠis located in the Xiaonanhu (drawing region), the bay of Lake Xihu, Station Ⅱ and Ⅲ are in the central lake and north-end of the lake (discharge region), respectively. Quantitative sampling of each group...

The long-term changes of zooplankton, including in species composition, abundance and regression analysis between biomass and water environment have been studied at three sampling stations (fromⅠ to Ⅲ) of Lake Xihu (West Lake), Hangzhou, a shallow eutrophic lake treated by water pumping and dredging. StationⅠis located in the Xiaonanhu (drawing region), the bay of Lake Xihu, Station Ⅱ and Ⅲ are in the central lake and north-end of the lake (discharge region), respectively. Quantitative sampling of each group of zooplankton were taken monthly from each station in 1990, 1995 and 2003. The main purposes of this paper are to describe long-term changes in zooplankton communities of Lake Xihu, and to discuss the possible mechanisms of the change.During the survey of 2003, 69 species of zooplankton were identified, among them 26 species were Protozoa, 27 Rotifera, 8 Cladocera and 8 Copepoda. From 1990 to 2003, the annual average density of zooplankton at Station Ⅰfrom 1270 ind./L increased to 1583 ind./L, from 3229 ind./L to 11022 ind./L at Station Ⅱ and from 3161 ind./L to 7390 ind./L at Station Ⅲ, the annual average biomass at Station Ⅰfrom 0.186 mg/L increased to 0.705 mg/L, from 0.665 mg/L to 1.399 mg/L at Station Ⅱand from 0.740 mg/L to 1.195 mg/L at Station Ⅲ. 99% of abundance and 78.0% of biomass of zooplankton were protozoans and rotifers.During 1990—2003, some of the dominant species of zooplankton, such as Tintinnoinea, Polyarthra Trigla and Bosmina longirostris increased their percentage in abundance remarkably, whilst the proportion of Diaphanosoma leuchtenbergianum was decreased at three stations, the proportion of Trichocerca pusilla was increased during 1990—1995 after water pumping treatment and declined in 2003 after dredging, Coleps hirtus, Keratella cochlearis and Diaphanosoma brachyurum, which were dominated in 1980s, have been disappeared from three stations in recent years. The abundance of Protozoa and Rotifera at Stations Ⅱ and Ⅲ were higher than that at Station Ⅰ for their higher trophic level. Diaphanosoma leuchtenbergianum, Bosmina longirostris, Bosminopsis deitersi and Sinocalanus dorrii were more common at Station Ⅰ for its lower trophic level, whereas Moina micrura and Thermocyclops dybowskii were more popular at Stations Ⅱ and Ⅲ. After dredging treatment, Protozoa biomass only at Station Ⅰwas positively correlated with Chlorophyll-a concentration and COD_ Mn . There was a significant positive relationship between Rotifera biomass and Chlorophyll-a concentration at three stations, biomass of Cladocera at each station was positively correlated with Chlorophyll-a concentration and COD_ Mn , and biomass of Copepoda at Stations Ⅱ and Ⅲ was positively correlated with Chlorophyll-a concentration and COD_ Mn . During 1990—2003, the biomass of Rotifera had positive linear relationships with pH value and chlorophylla-a concentration, and a negative relationship with transparency in Lake Xihu. The most significant ecological factor affected on rotifers biomass was chlorophylla-a concentration after pumping water from Qiantang River in 1995, and the ecological factor was the pH value of Lake water after dredging in 2003.The differences in water current and trophic level are responsible for the heterogeneous distribution of each part of zooplankton in Lake Xihu. The abundance of Protozoa and Rotifera has been increased rapidly, following the eutrophic process of the lake water.

研究了引水和疏浚工程支配下浅水、富营养化杭州西湖浮游动物群落的长期变化,包括浮游动物的优势种类组成、密度及生物量与水环境因子的相关分析。疏浚后的2003年调查中,西湖3个采样站的定量样品中共发现69种浮游动物,其中原生动物26种,轮虫27种,枝角类和桡足类各8种。Ⅰ站浮游动物年平均生物量从1990年的0·186mg/L上升到2003年的0·705mg/L,Ⅱ站和Ⅲ站分别从0·665mg/L和0·740mg/L上升到1.399mg/L和1·195mg/L。浮游动物数量组成中原生动物和轮虫平均占99%,并占78%的生物量。在1980~2003年期间,一些优势种类如砂壳纤毛虫(Tintinnoinea)、针簇多肢轮虫(Polyarthratrigla)和长额象鼻(Bosminalongirostris)等显著增加了它们的丰度和优势度;暗小异尾轮虫(Trichocerca pusilla)的优势度在引水后的1990~1995年增加了,但在疏浚后的2003年下降了;而20世纪80年代的一些优势种如毛板壳虫(Coleps hirtus)、螺形龟甲轮虫(Keratellacochelearis)和短尾秀体(Diapha...

研究了引水和疏浚工程支配下浅水、富营养化杭州西湖浮游动物群落的长期变化,包括浮游动物的优势种类组成、密度及生物量与水环境因子的相关分析。疏浚后的2003年调查中,西湖3个采样站的定量样品中共发现69种浮游动物,其中原生动物26种,轮虫27种,枝角类和桡足类各8种。Ⅰ站浮游动物年平均生物量从1990年的0·186mg/L上升到2003年的0·705mg/L,Ⅱ站和Ⅲ站分别从0·665mg/L和0·740mg/L上升到1.399mg/L和1·195mg/L。浮游动物数量组成中原生动物和轮虫平均占99%,并占78%的生物量。在1980~2003年期间,一些优势种类如砂壳纤毛虫(Tintinnoinea)、针簇多肢轮虫(Polyarthratrigla)和长额象鼻(Bosminalongirostris)等显著增加了它们的丰度和优势度;暗小异尾轮虫(Trichocerca pusilla)的优势度在引水后的1990~1995年增加了,但在疏浚后的2003年下降了;而20世纪80年代的一些优势种如毛板壳虫(Coleps hirtus)、螺形龟甲轮虫(Keratellacochelearis)和短尾秀体(Diaphanosoma brachyurum)等在3个采样站中失去优势种地位或消失。原生动物和轮虫生物量在营养水平较高的Ⅱ~Ⅲ站明显高于营养水平较低的Ⅰ站;长肢秀体(Diaphanosoma leuchtenbergianum)、长额象鼻、颈沟基合(Bosminopsis deitersi)和汤匙华哲水蚤(Sinocalanus dorrii)在营养水平较低的Ⅰ站具有较大的密度和生物量,而微型裸腹(Moinamicrura)和粗壮温剑水蚤(Thermocyclops dybowskii)则在营养水平较高的Ⅱ~Ⅲ站具有较大的密度和生物量。西湖各类浮游动物在不同湖区形成不同的分布格局主要由引水水流和水体营养状态差异造成。1990~2003年期间,在采样站变异下,浮游动物中轮虫年平均生物量与水体年平均pH值和叶绿素a含量之间分别有极显著和显著的正相关关系,与水体透明度之间有极显著的负相关关系。引水后的1995年,与轮虫生物量最密切的生态因子是叶绿素a含量,而疏浚后水体碱性环境是影响轮虫生物量最密切的生态因子。

Based on the data of the species abundance, biomass, diversity index of Copepoda and regression analysis between its biomass and factors of the water quality were studied at stations (from I to IV ) of West Lake Hang-zhou.a shallow eutrophic lake after dredging treatment. During the survey in 2003 , 9 species of Copepoda (3 Cal-anoida and 6 Cyclopoida) were identified from the quantitative samples. The density of Copepoda community increased after the drawing water current, but diversity index decreased....

Based on the data of the species abundance, biomass, diversity index of Copepoda and regression analysis between its biomass and factors of the water quality were studied at stations (from I to IV ) of West Lake Hang-zhou.a shallow eutrophic lake after dredging treatment. During the survey in 2003 , 9 species of Copepoda (3 Cal-anoida and 6 Cyclopoida) were identified from the quantitative samples. The density of Copepoda community increased after the drawing water current, but diversity index decreased. The abundance of Copepoda was much higher in Summer-Autumn than that in Winter - Spring season. Sinocalanus dorrii adults was more abundant at Station I with relatively lower trophic status. (TLI =55.3) , decreased along drawing water current, and Calanoida copep-odids density increased following the water current, while Thermocyclops dybouiskii adults was more abundant at Stations II - IV with relatively higher trophic status (TLI =62. 7 -63.5), Harpacticoida disappeared after dreding treatment. The effect of dreding treatment on Calanoida community heterogeneity of distribution was much stronger than that on Cyclopoida community. The biomass of Copepoda was positively correlative with Chlorophyll-a, CODMn and total phosphorus, while negatively with water transparency at Stations II -III.

本文调查了疏浚后杭州西湖(小型、浅水、富营养化湖泊)四个采样站(Ⅰ-Ⅳ)桡足类的密度、生物量和多样性指数,并对桡足类生物量与水质理化因子之间进行了相关分析.共发现桡足类9种,其中哲水蚤3种,剑水蚤6种.疏浚后,桡足类群落密度随着引水水流路程的加大而逐渐增大,多样性指数逐渐下降.桡足类群落丰度夏秋季明显大于冬春季.汤匙华哲水蚤(Sinocalanus dorrii)成体在营养水平较低的Ⅰ站(TLI=55.3)具有较大的密度和生物量,其分市沿着引流方向逐渐下降,而哲水蚤的桡足幼体则沿引流方向逐渐增加;粗壮温剑水蚤(Thermocyclops dybowskii)成体在营养水平较高的Ⅱ-Ⅳ站(TLI=62.7-63.5)具有较大的密度和生物量;疏浚使底柄种类猛水蚤(Harpacticoida)消失了.疏浚对哲水蚤密度分布分异的影响较大,对剑水蚤密度分布分异的影响较小.桡足类群落Ⅱ-Ⅲ站桡足类生物量随水体叶绿素a、高锰酸盐指数和总磷含量的升高而显著增加,随水体透明度的增大而显著下降.

Eutrophication evaluation of Lake Xihu,Hangzhou(Ⅰ-Ⅳ station) pro-and postdredging treatment using comprehensive trophic level index(TLIc) was investigated,and correlation coefficients of zooplankton biomass and TLIc was analyzed.The results showed that annual average value of TLIc declined clear in Station Ⅰand Station Ⅳ,declined little in Station Ⅱ and Station Ⅲ after dredging treatment.Dredging can promote organism oxidization and decomposition,decrease COD_(Mn) value,and restrain phosphorus...

Eutrophication evaluation of Lake Xihu,Hangzhou(Ⅰ-Ⅳ station) pro-and postdredging treatment using comprehensive trophic level index(TLIc) was investigated,and correlation coefficients of zooplankton biomass and TLIc was analyzed.The results showed that annual average value of TLIc declined clear in Station Ⅰand Station Ⅳ,declined little in Station Ⅱ and Station Ⅲ after dredging treatment.Dredging can promote organism oxidization and decomposition,decrease COD_(Mn) value,and restrain phosphorus release from sediment in the lake.It is found that the higher TLIc value of the lake water,the higher biomass of zooplankton.There is a stable positive linear relationship between biomass of Rotifer and TLIc value in the four stations.

以综合营养状态指数(TLIc)法评价疏浚前后杭州西湖(Ⅰ~Ⅳ站)的富营养化水平,并与水体浮游动物生物量指标做相关分析。结果表明,Ⅰ站和Ⅳ站综合营养状态指数年平均值下降幅度较大,Ⅱ站和Ⅲ站TLIc年平均值下降幅度较小。疏浚促进了西湖中有机物的氧化分解,降低水体中高锰酸盐指数,抑制底泥中磷的释放。湖水TLIc值随浮游动物生物量升高而显著增大,并以轮虫生物量与TLIc值之间的正相关性最稳定。

 
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