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首页> 外文学位 >Response of carabid assemblages to genetically modified herbicide-tolerant corn and to some sustainable farming practices.
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Response of carabid assemblages to genetically modified herbicide-tolerant corn and to some sustainable farming practices.

机译：卡拉比组合对转基因耐除草剂玉米和某些可持续农业作法的反应。

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摘要

In agricultural lands, predation of arthropod pests by natural enemies provides a tool for the development of farming strategies that rely less on insecticides. The Carabidae is a speciose family of beetles that constitute a large portion of these natural enemies and are known to be affected by farming practices. To investigate the impact of new farming practices on carabid assemblages, I used pitfall traps throughout the growing season in (1) experimental plots of conventional and genetically modified herbicide-tolerant (GMHT) corn under continuous and rotation regimes and (2) experimental plots of a rotation of wheat, potato and bean under sustainable and conventional farming practices. GMHT corn had a significant influence on the carabid assemblages in one of the two years investigated. It was associated with reduced activity density of the dominant species, Bembidion quadrimaculatum. Higher mid-season weed density in plots with GMHT corn is likely to explain these results. Rotation of corn with canola increased the activity density, lowered the diversity and modified the carabid community structure. Sustainable farming increased the activity density of carabids but did not increase diversity or significantly change the community structure. However, click beetle populations, which are potential pests, were also enhanced under sustainable farming. Many carabid species were associated with different crops which affected the year to year variation on community structure.
机译：在农业用地中，天敌捕食节肢动物害虫为开发较少依赖杀虫剂的耕作策略提供了一种工具。甲虫科是甲虫的特殊家族，占这些天敌的很大一部分，并且已知会受到耕作方式的影响。为了研究新的耕作方式对锁链组合的影响，我在（1）常规和转基因耐除草剂（GMHT）玉米的连续和轮作制度下的试验田和（2）在可持续和常规耕作方式下轮作小麦，马铃薯和豆类。在调查的两年中，其中之一对GMHT玉米对腕甲的组合产生了重大影响。这与优势物种Bembidion quadrimaculatum的活动密度降低有关。 GMHT玉米田中较高的季中杂草密度可能可以解释这些结果。双低油菜籽使玉米旋转增加了活性密度，降低了多样性并改变了卡拉比群落结构。可持续农业增加了锁甲的活动密度，但并未增加多样性或显着改变社区结构。但是，在可持续耕作下，作为潜在害虫的click虫种群也有所增加。许多腕足类物种与不同的农作物有关，影响了群落结构的逐年变化。

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  • 作者

    Bourassa, Stephane.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Agricultural.;Environmental Sciences.
  • 学位 M.Sc.
  • 年度 2006
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

  • 入库时间 2022-08-17 11:40:04

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