Horticultural science-a century of discovery and application

The Journal of Horticultural Science and Biotechnology (JHSB) celebrates, in 2019, a century of continuously publishing peer-review, research-based articles and reviews. Since 1919 scientific discoveries and their application through subsequently-evolved industrial technologies have formed the basis for enormous advances and changes in the production of fruit, vegetables and ornamentals. New industries have been founded and expanded. Science has brought greater precision, predictability and reliability into horticultural crop production, raising the quality and range of products Market forces themselves have imposed vast change in the manner by which horticultural products are produced. Horticultural industries have coped with and thrived on these changes because of their swift and effective adoption of discoveries in horticultural science, which in turn has driven the need for more research in a cyclic process. This review follows, through a selection of articles published in JHSB, the evolution of aspects of horticultural science and identifies how change has influenced crops and their production. The history of change in horticultural science and the industries which it serves is contained within the articles selected. They demonstrate the successful manner in which JHSB has fulfilled the aspirations of its founders for a science-based journal which offers new ideas for industry.     

贵溪市阳际峰自然保护区新发现成片蛛网萼群落

贵溪市阳际峰自然保护区双圳保护站发现国家二级保护植物蛛网萼成片群落分布.蛛网萼为东亚特有单种属植物,间断分布于中国和日本,在我国仅分布于赣东、闵北、浙西南及皖南的部分地区,而这次在贵溪市阳际峰自然保护区的不同海拔300m和900m都有分布,并且是大面积的成片群落分布,在我省乃至全国实属罕见.     

Dissection of Wheat Breeding in China by Marker/Trait Association

Besides the natural selection, the crops cultivated today have experienced two episodes of strong artificial selection, domestic and modem breeding. Domestication led to giant genetic structure differentiation between cultivars and their wild species, while modem breeding made further genetic structure differentiation between the modem varieties and the landraces. In a population, diversity of the loci under strong selection is significantly lower than that of other loci. At the same time, diversity in the genomic regions flanking these selected loci also declines in the process of selection. This phenomenon is called hitchhiking effects or selection sweep in genetics （Andolfatto, 2001）.     

一个基于语义相关性知识发现的模型与算法

办公自动化系统的发展方向是以知识管理为核心的办公自动化系统，知识发现、知识提取是其中重要的技术。基于语义相关性提出了一种知识发现的模型．并根据TextTiling算法给出了其实现方法。     

Classification Rule Discovery Based on Rough Set Theory

A strategy for finding smallest reduction of information system is studied by using concept of core in rough set theory. A method of discovering classification rule in databases is proposed.     

小RNA的研究进展

概述了小RNA的发现过程,介绍了小RNA的特征、功能、作用机制,并对其研究进行展望,以期为小RNA的研究提供参考。     

反事实思维与因果推理的关系

反事实思维是人们日常生活中经常产生的一种思维方式 ,这种思维常常影响因果推理和归因。国外许多研究者对他们的关系以及影响因素和机制进行了研究。该文对这些研究成果与分歧进行综述 ,并提出了需要进一步探讨的问题     

论发现式教学在数学教学改革中的作用

结合多年教学工作的实践,借鉴现代心理学和现代建构主义教学观,提出了发现式教学法的一般教学过程,在此基础上,探究了发现式教学法在学生的教学学习、教师的教学过程以及教材建设等方面的作用。并指出发现式教学法能否占领教学市场是衡量教学改革的一个重要标志。     

Reactivation of old landslides: lessons learned from a case-study in the Flemish Ardennes (Belgium)

The number of human‐induced landslides is increasing worldwide, but information on the impact of human intervention on slope stability is often lacking. Therefore, this study analyses the Hekkebrugstraat landslide, the best‐recorded landslide in the Flemish Ardennes (Belgium). Information obtained from local inhabitants, aerial photographs and newspaper articles enabled a 50‐year reconstruction of both the landslide history and the land‐use changes at or close to the landslide site. The reconstruction suggests that anthropogenic preliminary factors such as: (i) the absence of well‐maintained drainage ditches in the affected area; (ii) the elevation of the surface of the road, i.e. a sunken lane, in the affected area; (iii) increased surface runoff from the drainage area; (iv) the creation of ponds; and (v) the removal of the lateral support at the landslide foot have played an important role in the reactivation of the Hekkebrugstraat landslide. After the reactivation of February 1995, landslide movement was observed for more than 5 years and caused damage to houses, and other infrastructure. However, also natural factors, such as the presence of an impermeable clay layer at limited depth, springs and relatively steep slopes (i.e. 0.14 m m^?1), and above normal antecedent rainfall have contributed to the reactivations. Comparison of our reconstruction of the reactivation with precise Digital Terrain Models (DTMs) of 1952, 1973 and 1996, produced by digital stereophotogrammetry, indicated that the reported movements correspond well with the uplifted and collapsed zones found on the DTMs. Hence, this analysis provides valuable information for land‐use planners in areas with old, apparently stable, landslides.