1. The Concept of Germplasm Resources种质资源的概念 Genetic Resources Gene Resources Varietal Resources Gene Bank It refers to all the plant materials used for plant breeding
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Study Goals of This Chapter Main Objectives in Current Plant Breeding General Principles for Decision of Plant Breeding Objectives
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PREFACE前言 1. Introduction to the Course Nature of the Course Teaching Plan(54 hrs lec. +18 hrs exp.) Language of the Course (Bilingual Course)
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Hybridization Crossing Sexual Crossing Asexual Crossing Distant Crossing-interspecific Crossing Intraspecific Crossing-inter-varietal Crossing In this chapter: Hybridization Breeding i.e. CROSS BREEDING
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7-1城市园林绿地的生态效应 城市生态系统虽不象自然生态系统那样能承受 相当程度的外界干扰压力,通过负反馈调节维 持自身的平衡,但仍具有一定的抗外界干扰和 自我维持的能力。这一能力,在很大程度上来 自于城市园林绿地的生态效应 作为一个生态系统,城市在正常生产和消费的 同时,产生大量的余热、噪音和三废。这些污 染物质在城市生态阈值限度之内时,城市生态 系统有自我净化、自我消弭的能力,即:
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