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nematode communities
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  线虫群落
     Effect of elevated atmospheric CO_2 on soil nematode communities in a paddy-field
     大气CO_2浓度升高对稻田土壤线虫群落的影响
短句来源
     The investigation found that land-use could influence community characteristics of soil nematodes. Nematode communities of the same genera were seldom found in different niches.
     研究结果显示,土地利用方式对土壤线虫群落特征有一定影响,不同生境间土壤线虫群落共有属不多,农业生产活动促使土壤线虫向土壤下层移动;
短句来源
     The effect of free-air CO 2 enrichment (FACE) on soil nematode communities in a paddy-field ecosystem was conducted.
     本试验利用无锡稻 麦轮作FACE系统研究平台 ,开展了稻田土壤线虫群落对大气CO2 浓度升高响应的研究。
短句来源
     Studies on species composition and distribution of marine nematode communities in central and northern Taiwan Strait
     台湾海峡中北部海洋线虫群落的种类组成及分布
短句来源
     Soil nematode communities were investigated of different niches typical in the agro-pastural ecotone of West Jilin Province. A total of 1 264 individuals of 23 genera were collected with Aphelenchus and Pratylenchus being the dominant genera.
     对吉林省西部农牧交错区典型生境土壤线虫群落进行调查,共捕获线虫23属、1 264只,优势属为真滑刃属和短体属。
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  “nematode communities”译为未确定词的双语例句
     The overall discrimination of nematode communities under different vegetations could be drawn from Canonical Discriminant Analysis and three groups were identified including the 1st group (G1 and G2) with the highest nematode abundance and the 2nd group (Qc, Ss and Sm) with the lowest nematode abundance, and the 3rd group (Pm). In addition, nematode community stability of the 1st and 2nd group was similar and higher than that of the 3rd group.
     鉴别分析 (CDA)将不同植被下的样地分为 3组 ,自荒 1和自荒 2为 1组 ,小叶栎、木荷和混交林为 1组 ,而马尾松单独为 1组。
短句来源
     The density and structure of nematode communities(Filenchus cylindricus,Aphenlenchus sp.,Helicotylenchus dihystera,Criconemella spp.,Ogma sp.,Dorylaimida nematode,free nematodes) in soil nearby root of three common wild plants(Ageratum conyzoides,Parthenium hysterophorus,Bidens pilosa) were studied from Dec.2003 to Dec.2004.The studies include the effects of climate change and soil depth change on soil nematode communities in root soil around different wild plants.
     2003年12月~2004年12月在厦门大学附近丘陵中,调查了藿香蓟(Ageratum conyzoides)、银胶菊(Partheniumhysterophorus)以及鬼针草(B idens pilosa)根周土壤中的线虫类群(F ilenchus cylindricus,Aphenlenchussp.,Helicotylenchus di-hystera,Criconem ellaspp.,Ogmasp.,Dorylaim ida,无口针自由生活线虫),对线虫密度与季节、土壤深度和植物种类之间的关系进行了分析.
短句来源
     And the different species of plants do effect the density and structure of nematode communities in root soil.
     不同植物根周土壤线虫的类群和密度都有区别,说明植物种类会影响线虫类群的分布.
短句来源
  相似匹配句对
     ②nematode;
     ②病原线虫 ;
短句来源
     and nematode killed by B.t.
     种类、B.t.
短句来源
     Responses of nematode communities to land use in an aquic brown soil
     潮棕壤线虫群落对土地利用方式的响应
短句来源
     Effects of water managements on soil nematode communities in a paddy field
     稻田不同水分管理方式对土壤线虫群落的影响
短句来源
     On the Virescence and Administration of Communities
     浅谈小区绿化与管理
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  nematode communities
Key structural parameters measured were microbial biomass, nematode communities, microarthropod populations and diversity, enchytraeid and earthworm populations and plant growth.
      
Model predictions are in good agreement with observations on nematode communities in experimental fields contaminated with copper and zinc.
      
While disturbance from MB on the nematode communities lasted at least until the end of the pepper crop, that from the solarization often reduced or disappeared at the end of the experiment.
      
In general, responses of nematode communities to soil treatments were more obvious at pepper planting than at 4?months after planting.
      
Effects of Cover Cropping, Solarization, and Soil Fumigation on Nematode Communities
      
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The effects of chemical fertilizer on nematode community composition and diversity were investigated in a field throughout the corn growing season in the Black Soil Region, Northeast China. 14 families and 16 genera were observed. Cephalobidae, Rhabditidae, Aphelenchus , and Tylenchus were found to be the dominant families/genera. Significant differences were found between sampling dates ( p <0.01) and between treatments ( p <0.01) in the total number of nematodes during the study period. Ecological...

The effects of chemical fertilizer on nematode community composition and diversity were investigated in a field throughout the corn growing season in the Black Soil Region, Northeast China. 14 families and 16 genera were observed. Cephalobidae, Rhabditidae, Aphelenchus , and Tylenchus were found to be the dominant families/genera. Significant differences were found between sampling dates ( p <0.01) and between treatments ( p <0.01) in the total number of nematodes during the study period. Ecological indices of diversity, evenness, richness and dominance and the dynamics of the nematode community were compared between the treatment and the control plot. Shannon index and richness were found to be more sensitive indicators than other ecological indices for assessing the response of nematode communities to the application of chemical fertilizer.

本文针对玉米生长期内施用化肥对东北黑土地区线虫群落组成及多样性产生的影响进行了研究 ,共获得 14科、16属 ,其中头叶科 (Cephalobidae)、小杆科 (Rhabditidae)、真滑刃属 (Aphelenchus)、垫刃属 (Tylenchus)为优势科 /属。线虫总数在取样日期和处理之间存在着极显著差异 (p <0 .0 1)。应用多样性指数、均匀度指数、丰富度指数和优势度指数分析比较了施肥和不施肥试验小区土壤线虫群落多样性分布规律 ,其中Shannon多样性指数和丰富度指数是评价线虫群落对化肥投入最敏感的指数

This study was conducted from May 1999 to February 2000 in a long term revegetation experiment established in 1989 in Yujiang County (28°15′30″N, 116°55′30″E ), Jiangxi Province, China. The tested area, characterized by a warm wet spring and a hot dry summer, is a typical subtropical monsoon region with annual temperature of 17 8℃, and precipitation and evaporation of 1700mm and 1359mm, respectively. The soil type in the experimental station is red soil (Ultisol) derived from Quaternary red clay. Soil nematodes...

This study was conducted from May 1999 to February 2000 in a long term revegetation experiment established in 1989 in Yujiang County (28°15′30″N, 116°55′30″E ), Jiangxi Province, China. The tested area, characterized by a warm wet spring and a hot dry summer, is a typical subtropical monsoon region with annual temperature of 17 8℃, and precipitation and evaporation of 1700mm and 1359mm, respectively. The soil type in the experimental station is red soil (Ultisol) derived from Quaternary red clay. Soil nematodes were investigated seasonally with four kinds of artificially restored woodlands, including deciduous broadleaf woodland ( Quercus chenii, Qc), evergreen broadleaf woodland ( Schima superba, Ss ), coniferous woodland (Pinus massonina, Pm), and coniferous broadleaf mixed woodland ( Schima superba Pinus massonina, Sm), and two grasslands, i.e. slightly disturbed grassland (G1) and undisturbed grassland (G2). Nematode abundance differentiated distinctly under different vegetations, which was in the order of G2>G1>Pm>Qc>Ss>Sm. Nematodes showed obvious seasonal fluctuations. In general, nematode abundance was relatively high in spring and winter, followed by in autumn, and was lowest in summer. The dual depression of high temperature and low soil moisture was attributable to the sharp decrease of nematode population in summer. Based on variation coefficients of mean abundance, the lowest nematode community stability was found in Pm. Nematode abundance showed clear stratification with depth, which was in the order of 0~5cm>5~10cm>10~20cm. Correlation analysis demonstrated that nematode abundance was highly positively correlated with soil organic C, total N, available N, available P, soil microbial biomass C, soil microbial biomass N, potential mineralizable C, potential mineralizable N, basal respiration, invertase, urease and acid phosphatase in top soil ( P <0 01). However, it had no relationship with soil moisture, bulk density, clay content, sand content and available K. The overall discrimination of nematode communities under different vegetations could be drawn from Canonical Discriminant Analysis and three groups were identified including the 1st group (G1 and G2) with the highest nematode abundance and the 2nd group (Qc, Ss and Sm) with the lowest nematode abundance, and the 3rd group (Pm). In addition, nematode community stability of the 1st and 2nd group was similar and higher than that of the 3rd group. It is concluded that nematode abundance is a potential indicator of red soil quality. The complex relationships between nematodes and soil moisture and vegetation types were also discussed.

退化红壤不同植被恢复方式下土壤线虫数量的顺序为 :保护荒地 >干扰荒地 >马尾松 >小叶栎 >木荷 >混交林(木荷 -马尾松 )。土壤线虫数量的季节波动明显 :春季和冬季较多 ,秋季居中 ,而夏季极显著少于其它季节 (P<0 .0 1 )。就线虫数量季节变异系数所体现的群落稳定性而言 ,马尾松林地的变异系数最高 (P<0 .0 5 ) ,指示其群落最不稳定。线虫数量在土壤剖面中呈明显的垂直梯度分布。在表层土壤 ,线虫数量与代表碳氮和生物活性水平的土壤质量指标 ,如有机碳、全氮、速效氮磷、微生物量、潜在可矿化碳氮、基础呼吸、酶活性等 ,一般呈极显著正相关 (P<0 .0 1 ) ;而与代表土壤物理性质及交换性能的指标 ,如含水量、容重、颗粒组成、速效钾等一般没有相关性。鉴别分析 (CDA)将不同植被下的样地分为 3组 ,自荒 1和自荒 2为 1组 ,小叶栎、木荷和混交林为 1组 ,而马尾松单独为 1组。总之 ,不同植被恢复下线虫数量的分异初步体现了线虫指示红壤质量的潜力。

Agroecosystem health refers to the state of an agroecosystem where it is free from 'distress syndrome' and to cope with stress, or capability to produce agricultural products in a sustainable way. At present, the research of agroecosystem health focuses on assessment methods, soil and water quality, human health, ecologically based pest managernent,integrated weed management, ecopathology, nematode communities, transgenic crops, agricultural input policy, landscape ecology and green food development. Firstly,...

Agroecosystem health refers to the state of an agroecosystem where it is free from 'distress syndrome' and to cope with stress, or capability to produce agricultural products in a sustainable way. At present, the research of agroecosystem health focuses on assessment methods, soil and water quality, human health, ecologically based pest managernent,integrated weed management, ecopathology, nematode communities, transgenic crops, agricultural input policy, landscape ecology and green food development. Firstly, the present state of agroecosystem health research was described; then a case study of agroecosystem health, biological indicators of soil health, was introduced; finally, the research directions of agroecosystem health were put forward. This paper could provide a basis for ensuring agricultural product security and increasing human health.

农业生态系统健康是指农业生态系统免受发生“失调综合症”、处理胁迫的状态和满足持续生产农产品的能力 .目前 ,农业生态系统健康研究范围主要涉及农业生态系统健康评价方法、土壤质量和水质与农业生态系统健康的联系、农业生态系统健康与人类健康的关系、害虫生态管理对农业生态系统健康的贡献、杂草综合管理在农业生态系统健康中的作用、从生态病理学到农业生态系统健康、线虫群落作为农业生态系统健康指示生物的研究、转基因作物对农业生态系统健康的生态影响评价、农业投入政策对农业生态系统健康的影响、景观生态学在农业生态系统健康评价中的应用、农业生态系统健康与绿色食品开发等 .首先论述了农业生态系统健康研究的现状 ,介绍了农业生态系统健康研究实例———土壤健康的生物指标 ,最后提出了今后农业生态系统健康的研究方向 ,为保障农产品安全和增进人类健康提供依据

 
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