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species similarity index
相关语句
  物种相似系数
     The species similarity index among different reserves shows high,most of which is above 0.6,but formation similarity index is low,most of which is below 0.5.These indicate differences exist in formation types among different reserves. The outcome of cluster analysis is basically identical with that of similarity index analysis.
     不同保护区之间的物种相似系数很高,大部分在0.6以上,群系类型的相似系数较低,大部分在0.5以下,说明不同保护区之间的群系类型存在一些差异,聚类分析结果基本与相似性系数分析的结果一致。
短句来源
  “species similarity index”译为未确定词的双语例句
     The species similarity index was 1 among the seed banks under artificial vegetations,and 0.4 between those under artificial and natural vegetation. The development of moss crust increased the roughness of surface soil and improved soil environment significantly,which could have positive effects on seed entrapment and plant establishment.
     人工植被区土壤种子库物种相似性指数为1,相对较高,而人工植物区与天然植被区的物种相似性指数为0.4.苔藓结皮的出现增加了地表粗糙度,有利于对种子的捕获,同时显著地改善了土壤环境,有利于更多植物的定居.
短句来源
  相似匹配句对
     The similarity between species is the lowest.
     不同种之间的遗传相似程度最低。
短句来源
     species similarity of sand dune and grassland was low;
     沙丘与草场的植被相似性较差;
短句来源
     is the same species as C.
     又与C. laetevirens Pojark.
短句来源
     were the dominant species.
     为优势种群。
短句来源
     On the Similarity in Drawing
     论绘画中的“相似性”
短句来源
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species of mollusca were obtained from the intertidal zone of Nanji Archipalego Marine Nature Reserve during May 1992 tO March 1993, of which 18 species are newly recorded in this area. According to the distribution of faunae, mollusca of Nanji Archipalego belongs to the ChinaJapan subfauna of the Indian-Western Pacific biogeographic region.Five ecological groups were distinguished using species similarity indices, i. e. sandy beach community, mud flat community, giant rock community, shettered...

species of mollusca were obtained from the intertidal zone of Nanji Archipalego Marine Nature Reserve during May 1992 tO March 1993, of which 18 species are newly recorded in this area. According to the distribution of faunae, mollusca of Nanji Archipalego belongs to the ChinaJapan subfauna of the Indian-Western Pacific biogeographic region.Five ecological groups were distinguished using species similarity indices, i. e. sandy beach community, mud flat community, giant rock community, shettered rocky shore community and exposed rocky shore community. Species composition, diversity, biomass and individual numbers changing with seasonal variations and influenced by environmental parameters were analyzed. Habitat form, sea currents and wave action are the key factors for determining community ecosystem and the fauna characters.

本研究结果表明,共鉴定出软体动物143种,其中18种为该区域首次记录。根据种类相似性指数,将其分成5个生态群落:即开敞岩礁群落,隐蔽岩礁群落,巨砾群落,泥滩群落,沙滩群落。文中对各群落的种类组成、数量分布、季节变化及多样性指数等作了分析;同时对影响软体动物生态分布的潮汐、波浪、底质类型和生物因子等作了探讨。

To analysis the current marine environment status of Qinzhou Harbor,an investigation of the macrobenthos communities on the intertidal flats was carried out on spring and summer of 2001 Four sampling sections were settled,and the quantitative samples were gathered by quadrate method The species similarity index,biodiversity indexes and abundance biomass comparison method were applied for the analysis on the differences of the macrobenthos communities and the ecological quality of Qinzhou Harbor...

To analysis the current marine environment status of Qinzhou Harbor,an investigation of the macrobenthos communities on the intertidal flats was carried out on spring and summer of 2001 Four sampling sections were settled,and the quantitative samples were gathered by quadrate method The species similarity index,biodiversity indexes and abundance biomass comparison method were applied for the analysis on the differences of the macrobenthos communities and the ecological quality of Qinzhou Harbor The results showed that there were 70 species of macrobenthos recorded in this area,including 38 species of mollusks,18 species of crustacean,5 species of polychaete,4 species of fishes and 5 species of others Due to their similar habitats,the similarity index between the two sampling sections on either side of wharf area of Qinzhou harbor was the highest among the pairs of sections On the level of population,Cerithidea cingulata(Gmelin) was one of the major dominant species in either density or biomass And on the level of category,mollusks were the major dominant category By the abundance biomass comparison method,the two macrobenthos communities on either side of the wharf area of Qinzhou harbor are affected in certain degree This must be resulted from the frequent fluctuations on the living habitats of macrobenthos The similar conclusions can be obtained from the comparison of species numbers and three biodiversity indexes in four sections

为了了解钦州港海洋生态环境质量 ,于 2 0 0 1年春夏两季在钦州港码头区两侧的无名岛和旧营盘 ,及距离稍远的鸡墩头和鹿耳环的潮间带滩涂 ,对大型底栖动物状况进行调查。共设置 4条断面 ,每个断面设 2~ 3个站位 ,用样方方法定量采集动物样品。应用种类相似性指数、生物多样性指数和丰度生物量比较法分析大型底栖动物群落间差异及生态质量状况。结果表明 :该海域滩涂潮间带上发现有大型底栖动物 70种 ,包括软体动物贝类 38种 ,甲壳类 1 8种 ,多毛类 5种 ,鱼类 4种 ,及其他类群的动物 5种。生境的相似导致在钦州港码头区两侧的 2个断面潮间带动物群落间的相似性最大。在种群水平上 ,珠带拟蟹守螺 (Cerithidea cingulata)为丰度和生物量上的主要优势种。在类群水平上 ,贝类为主要的优势类群。应用丰度生物量比较法发现码头区两侧的 2个断面潮间带动物群落受到扰动 ,显然是由于环境经常变动导致的。同时 ,从 4个断面的潮间带动物物种数及3个生物多样性指数的比较也得到同样的结论

Field studies were conducted to evaluate the effects of three different crop rotation systems,rice-wheat (RW),maize-wheat (MW) and soybean-wheat (SW) rotation,on the characteristics of soil weed seedbank.The results showed that crop rotation significantly affects the density and species composition of weed seedbank.By rotation of wheat with maize (MW) and soybean (SW) for 2 years,seedbank density decreased 27.16% and 44.44% respectively compared with RW.Major weed species in the soil seedbank under rice-wheat...

Field studies were conducted to evaluate the effects of three different crop rotation systems,rice-wheat (RW),maize-wheat (MW) and soybean-wheat (SW) rotation,on the characteristics of soil weed seedbank.The results showed that crop rotation significantly affects the density and species composition of weed seedbank.By rotation of wheat with maize (MW) and soybean (SW) for 2 years,seedbank density decreased 27.16% and 44.44% respectively compared with RW.Major weed species in the soil seedbank under rice-wheat cropping were Lindernia procumbens,Cyperus difformis,Beckmannia syzigachne,Ammannia baccifera and L.chinensis .In MW,relative abundance (RA) of Digitaria sanguinalis,C.iria and Fimbristylis dichotoma increased significantly,but the RA of Monochoria vaginalis,A.baccifera,B.syzigachne decreased remarkably.While in SW,RA of Mazus japonicus,D.sanguinalis,Eclipta prostrata,F.dichotoma had shown marked increase.The species diversity of MW was higher than that of SW and RW.Based on the species similarity index of weed seedbank,the index between MW and SW was the highest.The reason why crop rotation affects the density and species composition of the weed seedbank is that the use of crop sequences diversify the selection pressure and prevent the proliferation of some weed species that has adapted well to a single cropping system.

为明确不同作物轮作制度对杂草种子库特征的影响,比较研究了玉米小麦(MW )、大豆小麦(SW)轮作和原水稻小麦(RW)轮作方式下杂草种子库的特征。结果表明,作物轮作显著影响杂草种子库的密度和种类组成,进行玉米小麦或大豆小麦轮作2年后,杂草种子库密度分别比稻麦轮作降低2 7 16 %、4 4 4 4 %。在原水稻 小麦轮作方式下,种子库中主要杂草为陌上菜、异型莎草、草、水苋菜、千金子等。玉米 小麦轮作使种子库中马唐、碎米莎草、飘拂草的相对优势度显著上升,鸭舌草、水苋菜、草的相对优势度显著下降。而在大豆 小麦轮作方式下,种子库中通泉草、马唐、鳢肠、飘拂草的相对优势度显著上升。玉米小麦轮作种子库的物种多样性指数高于大豆 小麦轮作和水稻 小麦轮作,玉米 小麦与大豆 小麦轮作种子库的物种组成相似性较高。作物轮作影响杂草种子库密度和种类组成的机制,可能在于通过轮换种植不同的作物,提供了多样化的选择压,限制了某些对单一种植系统有着良好适应性的杂草种类的生长

 
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