Analysis Of Crop-Model Research Status And Theme Evolution

In the information era,21th Century,the use of various information technology in agricultural field promotes agricultural development into a fine and intelligent stage."3S technology","crop model" and so on have become the focus of the research of agricultural researchers.Since the fact that Chinese agricultural model research and crop application are later than these developed countries,if China can not catch latest pace of international research and find correct research direction,Chinese process of agricultural informatization and modernization would be impacted seriously.Accordingly,it is necessary for Chinese research personnel of the crop model to understand current research status around the world.However,as the environment of information resource is renewable and complex,the availability of latest agricultural research become more and more difficult.The knowledge map,as a kind of research method,based on the method of Bibliometrics and visualization,can display the core structure,development history,frontier field and the whole framework of knowledge structure.Therefore,this paper introduces the research metlhods,Bibliometrics and social network analysis,to analyze the research of crop model:In the first part,the paper analyses the crop model and the situation of the related research review.Firstly,it introduces research significance,the related concept of the crop mode and its historical development.Then,it sumnmarizes the methods of related research for situation analysis.Finally,I make a investigation and survey for current research methods in the field of agricultural information technology.The second part is the analysis about the distribution,measurement,and cooperative analysis of the crop model studies.In this study,the data of the crop models in the SCI-E database were selected as the object of analysis.The life cycle of the crop model research in this field is divided by the time distribution of literature,agency and author.What's more,the paper also found that there are huge gaps around the world(worldwide institutions and authors)in quantity and quality for crop model research and a small number of countries(institutions or authors)are in a core position in this field.The papers of crop model research mainly sources from these subjects,agricultural/agronomy,plant science,environmental science and computer science,and its journals.In the perspective of productivity,competitiveness,influence and activity,it displays that the top five countries for every indexes are the United States,the Netherlands,Australia and France in terms of the country,institution and the analysis of the author.For china,except influence(ranked seventh),for corresponding institutions and authors,the rest of indexes also can get in the top five.In the views of the country,institution and the analysis of the author,the United States,the Netherlands,other key states,its institutions and their author still be in a core position in the international cooperation.Therefore,it is well worth strengthening cooperation with these key countries for Chinese relevant institutions.The last part mainly discuses the research theme and hotspot on crop model.In terms of high frequency word and visualization study,through the analysis of2006-2015,six affecting aspects were found for nearly a decade on crop model field,including "climate change","soil","water","irrigation","growth" and "yield".In the crop model analysis of the different key words in 2006-2015,it reveals that the theme of the crop model research continually changed recently.Through the contrastive analysis among the five key countries during 2011?2015,the analysis shows that with the same directive research altogether,because of different climatic conditions and vegetation crops,different states' specific research object and content vary ·This paper is also beneficial to clarify the idea of applying to the Bibliometrics,social network analysis and word frequency count.The situation analysis of crop model would be helpful for research specialist staff to understand the overview of international research,the trend of development and these potential cooperators in the agricultural field better,which also has referential significance for Chinese related departments of agricultural information technology and the departments of developing related policy.