| With the diversification of academic knowledge and the rapid development of information technology,information has grown in the form of an explosion,and the speed of interdisciplinary communication has been continuously promoted.In order to find hidden and orderly laws in massive information,scientists began to use scientometrics and information visualization techniques to mine these hidden information.This research will use the combination of macro and micro,qualitative and quantitative research methods,using scientometrics and information visualization technology to explore the development status of crop water demand research in macro analysis,aiming to explore scientific cooperation in the field of crop water demand research.The law of evolution of laws and research topics.From the micro-analysis level,based on the existing water demand and water shortage characteristics in the field of crop water demand research,empirical research on the main crop irrigation distribution system in Baoding City,Hebei Province,to obtain the current water demand distribution of crops,The problem of water resources waste in the application of agricultural water resources in Qing Dynasty provides reference for the development of reasonable irrigation water volume in Baoding City,Hebei Province in different periods;starting from the future development direction of crop water demand research,optimizing agricultural irrigation in Baoding City Countermeasures and suggestions are proposed for systematically,rationally utilizing the developed water resources,and maintaining the balance of the ecological environment.The study found:(1)In the research of crop water demand,through the method of mathematical statistics analysis,it is found that the growth trend of the number of literatures in China has entered the stage of steady growth of quantity,while the number of relevant literatures in the world is still in a stage of rapid growth.Active high-yield institutions have high academic influence.However,the relationship between different nodes in the national cooperation network and the institutional cooperation network is very complicated.The connections between the cooperative nodes are very close,and each node is associated with multiple nodes.In the author's cooperation,the cooperation mode from the early small group cooperation mode to the good network link type is presented,which is more conducive to the rapid and steady development of crop water demand.(2)After researching the field of crop water demand from all-round,multi-level and multi-angle,it is found that the research subject of this research field is diversified.The research theme was gradually developed from “seawater aquaculture wastewater irrigation” to research topics based on reflectivity-based crop coefficients,blue water consumption analysis,irrigation distribution system,soil water content,crop production,lpjml model,water demand,etc.,and predicted based on The two themes of reflectivity crop factor and lpjml model are not only current research hotspots,but will also have a lasting impact in the future.These research themes mainly focus on the practical methods and technical application aspects of crop water demand research,and less new research theories and new research ideas.(3)Focus on Baoding City,Hebei Province,and conduct an empirical analysis of the identified research theme “Irrigation Distribution System”.Based on the 33-year crop water requirement data of Baoding City,it was found through mutation test that the sudden change of water requirement of winter wheat was concentrated after 2007,while the mutation period of cotton and summer maize was around 2011.In the research field,the new development of biological new technology and new mutagenesis technology has been widely used in crop improvement and subsequent production,and has greatly improved the technical level of crop resource innovation and variety selection.In terms of crop effective rainfall,winter wheat has wintering ability,and most of the growth period is concentrated in the period of less precipitation,so the effective rainfall is significantly lower than cotton and summer corn.Since the water demand of crops is greater than the effective rainfall,the water shortage is positive.However,the water shortage of cotton and summer maize has decreased year by year in the past five years,and the water shortage situation of winter wheat is more severe.(4)In strengthening the ecological environment construction of Baoding City,it is necessary to explore all aspects from multiple perspectives.It is not enough to study the characteristics of crop water demand and water shortage under the theme of “irrigation distribution system”.Baoding City or other Water shortage areas should actively introduce new ideas,new ideas,and new methods in these cutting-edge themes,and fully absorb the knowledge of these research fronts,such as the use of the “lpjml model” for ecosystem structure and composition under medium-and long-term climate change.Conduct research to explore trends and spatial distribution of vegetation parameters over time.This can optimize the agricultural irrigation system,which is conducive to the rational allocation of agricultural irrigation water,is conducive to the development and protection of regional water resources,and is conducive to maintaining the balance of the ecological environment. |
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