Directional silviculture experiment and benefits of natural secondary broad - leaf forest 次生阔叶林定向培育试验及效益研究
2.
Directive breeding of microalgae and effects of it on environment factors in prawn pond 虾池微藻定向培育及其对养殖环境因子的影响
3.
For forest definite cultivating and optimal utilization of wood resources , many samples need testing 摘要林木定向培育和木材资源的优化利用，都需要对大量木材样本的性质进行快速测试。
4.
The result worked out here will provide strong scientific foundation and effective research approach when it comes to the research of wood quality and it ' s forming mechanism , wood transgene and directive breeding 这一结果将为木材性质研究、木材性质形成机理、树木优质种质资源培育、树木转基因工程、定向培育材质改良的树木新品种提供强有力的科学依据及研究方法。
5.
The rapid development of modem molecular biology technique suppies a possible and efficient way for us to solove the problem completely with a comprehensive researches results to transgenic fish in recent years both domestic and aboard , it proves that it " s possible and makes great senses to cultivate a high quality fish to meet the satisifaction of the people 现代分子生物学技术突飞猛进的发展为我们切底解决这一难题提供了可能性和有效途径。综观国内外近些年来对转基因鱼的研究及结果证明，通过转基因定向培育出符合人们所需要的优良鱼种是完全可能的，也是十分有意义的。
6.
The results indicated that as the intensity of sward cleavage increased , elymus nutans and other plants that had high requirements in soil aeration and resource space presented an increased competitive edge and the species that had low requirements in soil aeration and resource space presented an opposite picture ; low - intensity sward cleavage could help increase species diversity to a certain extent , but the diversity index appeared to decline as a whole as the cleavage intensity increased ; the effects of sward cleavage on functional groups of the vegetations showed in such manner as e . nutans - represented grasses increased in their composition with the intensity of sward cleavage raised , and sedges and forbs decreased in their compositions with the intensity of sward cleavage raised ; sward cleavage showed a significant improving effect on primary productivity of the meadows and was capable of increasing the proportion of quality - grass biomass to the total plant biomass ; sward cleavage could be independently employed as an effective measure to rehabilitate and improve alpine - meadow grasslands and thus played a basic and key role in the technical combination aiming at establishing hay fields characterized by e . nutans 结果表明：垂穗披碱草等对土壤通透性和资源空间要求较高的物种，竞争力随划破强度的增加而上升，而对土壤通透性和资源空间要求相对较低的物种则相反；轻度划破干扰对提高物种丰富度具有一定的促进作用，但多样性指数则总体上表现为随划破强度的增加而呈下降的趋势；划破干扰对植被功能群的影响表现为以垂穗披碱草为代表的禾草类组分随干扰强度的增加而显著上升，莎草类和杂类草组分随干扰强度的增加而显著下降；划破干扰对草地初级生产力的提升具有显著的促进作用，且可显著增加植物总量中优质牧草的比重；划破干扰可独立作为高寒草甸类草地恢复与改良的有效措施，在定向培育垂穗披碱草型割草场的技术组合中具有核心和基础性的地位。
