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厚朴不同栽培模式的生物多样性 总被引:1,自引:0,他引:1
采用标准地法对不同植物配置模式的厚朴(Magnolia officinalis Rehd.et Wils)群落生物多样性进行了研究,结果显示,恩施产区的厚朴为人工栽培群落,主栽树种厚朴的重要值为70.4333,在数量上占绝对优势。厚朴与林木混交栽培模式的生物多样性指数和物种丰富度指数显著高于其他几种配置模式。同时对不同栽培模式下害虫的发生量进行了调查,结果发现,厚-林配置的主要害虫有虫株率仅为10.34%,而纯林害虫的发生量最大,表明厚-林模式是一种较为理想的配置。采用该模式发展厚朴和对现有厚朴纯林加以林分改造,是提高生物多样性和控制厚朴害虫发生最有效的生态措施。 相似文献
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新时代中国特色社会主义事业总体布局为"五位一体",到21世纪中叶,我国物质文明、政治文明、精神文明、社会文明、生态文明将全面提升,把我国建设成为富强、民主、文明、和谐、美丽的社会主义现代化强国。本文阐述了生态文明的概念及其提出背景,分析了生态文明建设对农业生产的要求,并在此基础上对生态文明视角下的农业生产模式选择进行了初步探析。 相似文献
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[Objective] This study was to reveal the genetic diversity and genetic relationship of the kenaf(Hibiscus cannabinus L.) resources from different origins, thus providing basis for genetic improvement and molecular marker-assisted breeding of kenaf. [Method] Ninety one ISSR molecular markers were used for amplification on 44 shares of kenaf germplasm resources, of which 21 showing good diversity and clear bands were chosen for PCR amplification. Based on amplification results, the genetic similarity coefficients among kenaf germplasm resources were calculated by using analytic software NTSYSpc-2.10e, and phylogenetic tree was then established via UPGMA. [Result] Totally 169 bands were amplified using the 21 screened primers, averagely 8.05 bands were amplified from each primer. Of them, 141 bands were polymorphic, accounting for 83.4%. When genetic similarity coefficient 0.887 was used as criterion L1, these 44 shares of kenaf germplasm could be classified to be 32 shares of cultivars and 12 shares of wild type or half-wild type varieties. When genetic similarity coefficient 0.897 was used as criterion L2, these 32 shares of cultivars could be further grouped into four sub-clusters. The genetic diversities between cultivars and wild type or half-wild type varieties were between 0.46-0.91, showing huge hereditary difference; while that among 32 cultivars were between 0.85-0.97, suggesting that genetic relationships among cultivars are relatively close and their genetic similarities are rather narrow. [Conclusion] ISSR could well determine the genetic similarities among kenaf germplasm resources and provide valuable molecular information for selecting parents of hybrid cross, which can lay a good foundation for DNA mapping of kenaf germplasm resources. 相似文献
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对茭白中小拱棚栽培技术的研究结果表明,中小拱棚栽培具有成本低、投资少、操作简便,农民容易接受等优点,可以达到大棚栽培同样目的。 相似文献
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着重讨论了茭白鞘叶栽培蘑菇、草菇、鸡腿菇等食用菌的可行性,分析了茭白鞘叶裁培食用菌的经济和生态效益。提出了利用茭白鞘叶栽培蘑菇、草菇、鸡腿菇的参考配方和栽培工艺。 相似文献
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对茭白二化螟的越冬和产卵习性,钻蛀和转移规律,田间种群动态,天敌种类和田间防治进行了调查和研究。结果表明,二化螟主要以6龄老熟幼虫在茭白残茬中钻蛀越冬,翌年4月中下旬为化蛹高峰期,4月中旬末至下旬为羽化高峰期。二化螟成虫主要将卵产在叶片上,叶鞘上为少数;大多数卵块产于心叶、倒一叶和倒二叶叶枕以上0—60cm范围内,少数产在叶鞘上。其初孵蚁螟喜钻蛀倒4、倒5叶叶鞘内侧的叶肉中,2龄后开始往内侧叶转移钻蛀。茭白田中二化螟的虫口密度高,发生期较集中,5月上中旬为第一代卵孵盛期,7月中旬为第二代的卵孵盛期,8月下旬末9月上旬为第三代的卵孵盛期。其主要天敌为螟黄足绒茧蜂和白僵菌。植物性杀虫剂绿浪和化学农药锐劲特对其有较好的防治效果。 相似文献