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911.
912.
Relationshipbetweenbioaccumulation,distributionofMETandlipidcontentofaquaticorganismsLiuZhengtao;ZhouFengfan;JinHongjun(Depar... 相似文献
913.
Compared to modern, conventional agriculture, alternative agricultural production systems may rely on biologically different mechanisms (syndromes) to attain similar production goals. Yield loss to rice in conventional and natural farming rice paddies in Japan was evaluated by simulated injury (leaf-clipping) and monitoring plants damaged by insect herbivores. Rice grown under natural farming practices was more tolerant of simulated injury and injury from Oulema oryzae than rice grown under conventional practices. Natural farming rice retained proportionately more tillers and had a higher proportion of mature seeds than conventionally grown rice. In conventional paddies, the simulated injury may have made the rice plants more susceptible to plant pathogens than their non-injured counterparts, resulting in higher disease attack and proportionately greater yield loss. These results suggest that, pests may affect yield loss independently in natural farming, but in conventional paddies, multiple pest injury may interact synergistically, compounding yield loss. 相似文献
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915.
916.
新毒性试验生物萼花臂尾轮虫的特性试验 总被引:2,自引:0,他引:2
研究了萼花臂尾轮虫Brachionus calyciflorus 24h标准化急性毒性试验的可行性和优越性。应用轮虫休眠卵,在25℃、3000lx的强光照下进行孵化,吸取孵化后3h内的幼体,进行24h(暗相)急性毒性试验。研究表明,Cu、Hg、NaPCP、SDS、Cd、Zn、Ni、NH3对B.calyciflorus的24h LC50值分别为0.022、0.043、1.30、1.47、1.77、1 相似文献
917.
918.
Ecological toxicity of reactive X-3B red dye and cadmium acting on wheat (Triticum aestivum) 总被引:17,自引:4,他引:17
IntroductionWiththeincreasingvarietiesandquantitiesofdyesenteringintotheenvironment,dyes,asanimportanttypeofpollutants,haveanadverseeffectonwater soil plantsystems ,accordingtosomeexperimentalresults(Cheng ,inpress) .IntheeasternChina ,industrialwastewaterf… 相似文献
919.
钼和硼污染对大豆品质的影响 总被引:1,自引:0,他引:1
以3个大豆(Glycine max)品种(浙春3号、浙春2号和3811)为材料,设置了4个钼、硼处理(适量钼和硼、高钼、高硼及高钼高硼同施),研究了钼污染和硼污染对大豆品质的影响.结果表明:高钼或高硼促使大豆种子蛋白质、维生素C、氮、磷、钾的含量显著减少,氨基酸的总量和必需氨基酸的总量大大降低,氨基酸各组分(除脯氨酸外)的含量都明显下降,脂肪的组分也发生变化,对种子中钙镁含量的影响不大,且高硼对大豆品质的毒害作用明显大于高钼.在过量条件下,钼和硼在大豆体内呈现相互抑制作用.3个大豆品种的品质问存在一定的基因型差异,3个品种对高钼和高硼的反应也存在差异.图2表3参18 相似文献
920.
An Overview of Contaminant-Related Issues Identified by Monitoring in San Francisco Bay 总被引:1,自引:0,他引:1
Bruce Thompson Rainer Hoenicke Jay A. Davis Andrew Gunther 《Environmental monitoring and assessment》2000,64(1):409-419
The San Francisco Estuary Regional Monitoring Program for Trace Substances (RMP) began in 1993 and is sponsored by 74 local, state, and federal agencies and companies through their discharge or Bay use permits. The RMP monitors water, sediment, toxicity, and bivalve bioaccumulation at 25 sites in the Bay that are considered to represent "background" conditions. Several major environmental issues have been identified by the RMP. Polychlorinated biphenyls and mercury were often above water quality guidelines, and often occurred in fish tissues above U.S. Environmental Protection Agency (U.S. EPA) screening values. Concentrations do not appear to be decreasing, suggesting continuing inputs. Episodes of aquatic toxicity often occurred following runoff events that transport contaminants into the Bay from urbanized and agricultural portions of the watershed. Sediment toxicity occurred throughout the Bay, and has been correlated with concentrations of specific contaminants (chlordanes, polynuclear aromatic hydrocarbons) at some locations; mixtures of contaminants were probably also important. Since the RMP does not monitor all ecosystem components, assessments of the overall condition of the Bay cannot be made. However, in terms of contamination, the RMP samples suggest that the South Bay, and North Bay sites are moderately contaminated. 相似文献