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XIE Xueqiang 《Journal of Landscape Research》2020,(2):95-98
The native and introduced ground cover plants were screened by field survey,cultivation test and configuration effect evaluation in arid valleys of Ganzi Tibetan area.A total of 205 species belonging to 140 genera,67 families were selected as applicable types.Among them,there were 53 species of evergreen shrubs,36 species of deciduous shrubs,17 species of woody vines,99 species of herbaceous plants;27 species of color-leafed plants,8 species of succulent plants.And 79 species were recommended as the best ground cover plants.Higher plants in Ganzi Tibetan area were increased to 5,362 species,1147 genera,244 families through screening. 相似文献
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我国是畜牧业和畜禽产品生产、消费大国,肉类的产量居世界第一位.但畜产品的出口量却不多,这很大程度上源于我国的畜产品存在质量安全问题.随着人们安全意识的不断提高,以及我国加入WTO,发展无污染、无残留、对人类健康无损害的畜产品已成为必然选择.…… 相似文献
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功能性复方荷叶袋泡茶的研制 总被引:2,自引:0,他引:2
采用荷叶、菊花和茶叶三种原料,通过两两组合选优、再三者组合优化配比,试图筛选出口感好、营养成分搭配合理的最佳配方。结果表明:组合chj2营养保健成分氨基酸和茶多酚含量较高,含水量较低,感官评定茶汤绿色清澈、香气清新、口感纯正,是一种较理想的配比组合。包装袋大小、冲茶水温、制作原料等因素对袋泡茶茶水品质有较大影响,要求包装袋大小适中,以容纳3~4g的规格大小为宜;水温一般以80~90℃比较好,冲泡后茶汤香气清新、汤色清绿、味道纯正;原料要求新鲜无霉变、品质纯正,确保袋泡茶质量。 相似文献
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以山杏幼叶为材料,比较了4种DNA提取方法。结果表明,处理为100mmol/LTris2HCl(pH8.0)、20mmol/LEDTA(pH8.0)、1.4mmol/LNaCl、2%CTA、10mmol/LNa2S2O5、2%β-巯基乙醇、1%PVP-40、1%Vc的CTAB4方法提取的基因组总DNA质量较高,DNA溶液无色透明,紫外分光光度计测得OD260/OD280为1.8~2.0,无降解现象,RNA去除干净,经AFLP分析条带清晰,多态性好,说明此法提取的DNA能够适应AFLP分析的要求。 相似文献
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香蕉炭疽病生物防治研究进展 总被引:2,自引:0,他引:2
香蕉炭疽病是香蕉采后一种重要病害,生物防治香蕉炭疽病成为研究的热点。此文介绍了香蕉炭疽病的主要症状及概述了两种不同方式对香蕉炭疽病进行生物防治。其一,利用生防菌(如枯草芽孢杆菌,假单胞杆菌,链霉菌等)对香蕉炭疽病进行生物防治,生防菌主要是对香蕉炭疽菌菌丝的生长,孢子萌发,附着孢的形成有影响。其二,从植物中提取活性物质对香蕉炭疽病进行生物防治,其中艾蒿、大茴香、丁香、花椒、桂圆等植物的活性物质对香蕉炭疽病有明显的抑制作用。最后,提出生物防治香蕉炭疽病存在的问题及展望。 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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南瓜降糖功能及其系列食品加工技术 总被引:3,自引:0,他引:3
阐述了南瓜在糖尿病辅助治疗方面的功能特性,介绍了南瓜降糖主要制品南瓜全粉、南瓜脆片、南瓜果酱和南瓜肉汁的工艺流程和操作要点。 相似文献
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母猪繁殖障碍成因分析 总被引:3,自引:0,他引:3
繁殖障碍是导致母猪淘汰的最主要因素,直接造成母猪非生产天数延长,繁殖猪群生产效率降低,严重影响猪场的经济效益。本文作者对引起母猪繁殖障碍的多方面因素,包括营养因素(如饲养水平、饲料品质、断奶日龄)、环境因素(如温度、湿度、通风、光照)、疫病因素、生产技术及管理因素进行了详细阐述。 相似文献
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Based on the relation between the incipient yield pressure and the limit of yielding in cylinder according to the elastic disabled rule, a laboratorial method of determining limit of yielding of material is designed and a set of experimental data were gained by the method. The incipient yield pressure of the cylinder is gained by analyzing the experimental data, and then the limit of yielding is gained. The laboratorial method has a good reliability as the experimental value has a little error to the theory value. It has a definite engineering signification and theory value to research the mechanical capability of material and the disabled rule of high pressure vessel. 相似文献
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基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为:(1)布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。(2)四个分区(即高山区、丘陵区、平原区、荒漠区)的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区(3)从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。 相似文献
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Efficiency of water use of early plantings of sunflower 总被引:4,自引:0,他引:4
M. Auxiliadora Soriano Francisco Orgaz Francisco J. Villalobos Elías Fereres 《European Journal of Agronomy》2004,21(4):465-476
Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha−1, while late plantings yields were 1.3 and 2.4 t ha−1, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha−1 for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment. 相似文献