日光温室韭菜优良新品种——冰冬

“冰冬”是由河南省通许县果树蔬菜研究所育成的适应日光温室栽培的韭菜优良新品种。该品种具有优质、高产、抗病、特抗寒等优点。目前“冰冬”已在全国60多个试点示范成功。

冬季温室韭菜新品种——冰冬

适应冬季温室韭菜栽培的优良新品种“冰冬”，是由河南省通许县果树蔬菜研究所培育而成的。该品种具有优质、高产、稳产、抗病、特抗寒、抗逆性强等优点。目前，冰冬韭菜已在全国60多个试点示范成功。

Greenland Ice Sheet Elevation Change in Winter and Influence of Atmospheric Teleconnections in the Northern Hemisphere

The relationship between the variability of the surface elevation of the Greenland Ice Sheet (GIS) in winter and sea level pressure is identified through analysis of data from satellite-borne radar altimeters, together with meteorological data fields during 1993 2005. We found that both the North Pacific Oscillation (NPO) and the North Atlantic Oscillation (NAO), the two major teleconnection patterns of the atmospheric surface pressure fields in the Northern Hemisphere, significantly influence the GIS winter elevation change. Further, it is suggested that the NPO may affect the GIS accumulation by influencing the NAO, particularly by changing the intensity and location of the Icelandic Low.

The Evolution of Water Property in the Mackenzie Bay Polynya During Antarctic Winter

Temperature and salinity profile data, collected by southern elephant seals equipped with autonomous CTD-Satellite Relay Data Loggers(CTD-SRDLs) during the Antarctic wintertime in 2011 and 2012, were used to study the evolution of water property and the resultant formation of the high density water in the Mackenzie Bay polynya(MBP) in front of the Amery Ice Shelf(AIS). In late March the upper 100–200 m layer is characterized by strong halocline and inversion thermocline. The mixed layer keeps deepening up to 250 m by mid-April with potential temperature remaining nearly the surface freezing point and sea surface salinity increasing from 34.00 to 34.21. From then on until mid-May, the whole water column stays isothermally at about^(-1).90℃while the surface salinity increases by a further 0.23. Hereafter the temperature increases while salinity decreases along with the increasing depth both by 0.1 order of magnitude vertically. The upper ocean heat content ranging from 120.5 to 2.9 MJ m^(-2), heat flux with the values of 9.8–287.0 W m^(-2) loss and the sea ice growth rates of 4.3–11.7 cm d^(-1) were estimated by using simple 1-D heat and salt budget methods. The MBP exists throughout the whole Antarctic winter(March to October) due to the air-sea-ice interaction, with an average size of about 5.0×10~3 km^2. It can be speculated that the decrease of the salinity of the upper ocean may occur after October each year. The recurring sea-ice production and the associated brine rejection process increase the salinity of the water column in the MBP progressively, resulting in, eventually, the formation of a large body of high density water.

Associations between the Autumn Arctic Sea Ice and North American Winter Precipitation

Associations between the autumn Arctic sea ice concentrations (SICs) and North American winter precipitation were examined using singular value decomposition. The results show that a reduced SIC in the majority of the Arctic is accompanied by dry conditions over the Great Plains, the southern United States, Mexico, eastern Alaska, and southeastern Greenland, and by wet conditions over the majority of Canada, the northeastern United States, and the majority of Greenland. Atmospheric circulation anomalies associated with the SIC variability show a wave train structure that is persistent from autumn to winter and is responsible for the covariability between the autumn Arctic SICs and North American winter precipitation. This relationship suggests a potential long-term outlook for the North American winter precipitation.

A Pre-game Evaluation of the Tourism Legacy of the Beijing 2022 Winter Olympic Games

The role of tourism in social and economic development and stabilizing the Olympic legacy has been widely discussed.Beijing is the first“Dual-Olympic City”.For the first time,the Beijing Winter Olympics has adopted a model of three competition areas,which has attracted much attention to the study of its tourism legacy.In the legacy plan,the construction of the“Beijing-Zhangjiakou Sports Culture and Tourism Belt”was proposed.The development of ice and snow tourism and the cultivation of the ice and snow tourism market is also reflected in many policy documents and government actions.The scientific planning before the competition laid a good foundation for the sustainable development of its ice and snow tourism heritage.This research combines Olympic legacy research with tourism destination theory,and focuses on ice and snow tourism directly related to the Winter Olympics and the significance of pre-event planning for legacy protection.At the same time,the improvement of the quality of ice and snow tourism destinations is embedded in the pre-Olympic legacy,and opinions and suggestions on how to ensure the stability of the legacy after the games are given.This study uses the literature review method and the second-hand materials survey research method,then through establishing a tourism legacy pre-game evaluation model and the use of geographic information,government reports,policies,publicly released statistics and news reports,etc..It explores the legacy of the Beijing 2022 Winter Olympics and Paralympics,aiming to lay the foundation for preserving the continuous value of the ice and snow tourism legacy during and after the Olympics.The results indicate that the Beijing Winter Olympics has made relatively complete plans and reliable progress in both tangible and intangible legacy.Complete tourism infrastructure,an optimistic sport and cultural atmosphere,and the improvement of residents’health concept and sports awareness have become boosters for the development of ice and snow tourism in the Beijing-Zhangjiakou region.

Sustainable Development of Ice and Snow Tourism-Theory&Empirical Studies:Preface

The Beijing Winter Olympics brought a historical miracle to the development of China’s ice and snow tourism.It is both an opportunity and a challenge to reap the extra dividends of the times and to develop China’s ice and snow tourism.By selecting 18 academic papers,this special issue deeply discusses the status quo and the future measures of ice and snow tourism in China from three aspects:ice and snow tourism development and management,the ice and snow tourism experience and its influencing factors,and ice and snow tourism impact assessment.Moreover,one part entitled“Tourism Culture and Ecotourism”has been set up to emphasize those cutting-edge research topics.It is worth mentioning that this issue is in-depth and has profound connotations.First of all,the research area ranges from national to regional to the city-level,including both longitudinal and horizontal research.In additon,the research methods are practical,innovative,and at the frontier of scientific research,and include industrial correlation analysis methods,kernel density,spatial autocorrelation and other geospatial analysis methods,content analysis methods,sentiment analysis methods,structural equation models,Delphi methods,spatial statistics methods,geographic detector method and many others.In general,this special issue combines qualitative research with quantitative research,provides a variety of theoretical perspectives such as perceived value theory,institutional evolution theory,etc.,and builds various useful models like the pre-competition evaluation model for ice and snow tourism heritage,the consumption skill-travel radius decision-making influence model under the moderating effect of the ski resort comprehensive leisure environment,the evaluation model of the suitability of glacier tourism resource development,the model of the relationship between tourists’experience value and loyalty in the context of ice and snow tourism,among others.These studies are expected to provide theoretical and practical guidance for the development of ice and snow tourism in the post-Winter Olympics era,and help ice and snow tourism develop in a sustainable and high-quality direction.

Evolution of herbs: key to the conundrum might be tolerance not avoidance

Aims Woody plants represent the ancestral growth form in angiosperms with herbs evolving repeatedly from them.While there are a number of hypotheses about drivers of the evolution of the herbaceous habit,the ability to avoid frost damage in winter by discarding their aboveground biomass has often been invoked as the main force in their evolution.We propose instead that any unpredictable disturbance might have been much more important than the seasonal frost,as herbs easily survive repeated disturbance.Methods We tested this hypothesis by comparing herbs and woody plants in their ability to deal with three types of simulated disturbances,more predictable winter freezing,less predictable spring freezing and herbivory.Comparison was made in an experimental common garden setup with 20 species differing in woodiness.We evaluated the effects of these disturbances on mortality and regrowth of plants.Important Findings Herbs did not have an advantage over woody plants in survival when exposed to winter freezing.In less predictable conditions of spring freezing herbs survived the treatment better than woody plants and this advantage was even larger in case of the simulated herbivory treatment.The advantage of herbs over woody plants in less predictable conditions suggests that herbaceous growth form might be an adaptation to unpredictable disturbance,which herbs are able to tolerate thanks to their ability to survive loss of aboveground biomass.Consequently,factors such as mammal herbivory or fire might have been the most likely factors in the transition from woody species to herbs.

Breaking the Ice

Since Beijing and Zhangjiakou in neighboring Hebei Province won the bid to host the 2022 Winter Olympics,the entire country has become increasingly enthusiastic about winter sports.Skiing and skating are popular winter activities while lesser-known games such as curling and ice hockey have also become familiar to sports lovers.

High-quality Development Paths of Ice-snow Tourism in China from the Perspective of the Winter Olympics

Preparations for the Beijing Winter Olympics have promoted the rapid development of ice-snow tourism in China,which contributes to achieving the goal of having“300 million people participate in ice-snow sports”.This paper analyzes the status quo and problems associated with the growth of ice-snow tourism in China based on the methods of documentation and field investigation.The results indicate that China’s efforts have born abundant fruits.Notwithstanding,there are still some problems due to the limited time and hastened process of ice-snow tourism development,including unreasonable exploitation,low-quality products and services,imperfect investment and financing system,inadequate management,a single marketing mode,and insufficient talent teams.Compared with developed countries in Europe and the United States,ice-snow tourism in China is in the stage of rapid development.To achieve the high-quality development of ice-snow tourism in China,this paper proposes actions from eight aspects which involve policy,products and services,marketing,safety management and control,talent teams,standardization construction,science and technology,and community participation.This study can provide references for the high-quality development of ice-snow tourism in China,as well as perfecting Chinese theoretical research on ice-snow tourism.

Evaluation and Promotion Model of Tourist Satisfaction in Ice and Snow Tourism Destinations

The successful bid for the Beijing Winter Olympics has brought historic opportunities for the development of ice and snow tourism in China.An index system for the evaluation of tourist satisfaction in ice and snow tourism destinations was constructed from the target layer-factor layer-index layer approach in this paper.Taking tourists with ice and snow tourism experience as the research object,and integrating a questionnaire survey and the Importance-Performance Analysis(IPA)method,a total of 840 valid questionnaires were collected to assess the satisfaction of tourists in snow and ice tourism destinations,and the promotion model of tourist satisfaction in ice and snow tourism destinations was put forward.This process led to three main results.(1)Ice and snow tourists in China are characterized as young and better-educated,with college students aged 19 to 25 as the main consumer group.More than 70%of ice and snow tourists are pretty satisfied with the current development of ice and snow destinations in China,and are willing to participate again.(2)Other than“ice and snow souvenirs”,tourists’perceptions of importance are all higher than the level of perceived satisfaction,and the importance values of the 13 indicators including“Scenic spot security”and“Diversity of ice and snow entertainment and sports”are especially high,showing that tourists have high expectations and demands of the destinations.However,the perceived satisfaction level of tourists for all indexes is generally low,mostly at the general satisfaction level,indicating that ice and snow tourism destinations have only partially met the demands of ice and snow tourists,and there is still much room for improvement.(3)After IPA analysis,five suggestions for improving the satisfaction of tourists in ice and snow tourism destinations were put forward,including diversification of the tourism business model,construction of tourism facilities,a market diversified cultivation model,a humanized mode of tourism service and a refined management model.The results of this study will help to enrich the theory of ice and snow tourist satisfaction and promote the high-quality development of China's ice and snow tourism in the post-Winter Olympics era.