Research And Implementation Of Data Management System For Distributed Lysimeter Group

Lysimeter is the professional equipment that measures the evapotranspiration,surface runoff and underground runoff in the hydrological cycle.By the automatic collection of soil moisture variation,it can realize the balance of supply and demand analysis of agricultural water,which can help researchers to find the trend of soil moisture variation accurately,and provide effective data support for statistical crop growth patterns.Recently,agricultural research institutes have installed and deployed different types of lysimeter equipment in their agricultural demonstration areas,which forms a distributed lysimeter group system.In this paper,a data management system for distributed lysimeter group is designed and the needs of remote monitoring,management and analysis of lysimeter data are realized.Specifically,the system uses 4G wireless communication network to upload the lysimeter group data and download control commands which realizes the data management and device control for the lysimeter group.In addition,the function of remote query,analysis and management of lysimeter data and the remote monitoring and control of lysimeter equipment are realized by browsing and accessing the data management platform.It is proved that the system is benificial for improving the information management level of agricultural demonstration zones effectively in our country.The main contents and results are as follows:(1)Considering the process of lysimeter group data collection,transmission and application,the structure of the distributed lysimeter group data management system is designed by using the layered structure idea.Furthermore,combined with the functions of the distributed lysimeter group data management system,the three layers of the system structure,the sensing layer,the network transport layer and the application layer,are designed in detail.(2)Aiming at the requirements of effective monitoring,processing and analysis of distributed lysimeter group data,the 4G wireless communication network is used to upload lysimeter group data and download the control commands.On this basis,the wireless data transmission mechanism,mode and protocol of the system are studied.Finally,a dynamic feedback load balancing strategy is proposed to solve the multi-concurrent problem for wireless data transmission in distributed lysimeter group.(3)According to the needs of users,a distributed lysimeter group data management platform is designed.Based on the modular design idea,the data management module,the equipment management module and the system management module are designed by using the Java EE technology which realizes the remote management of the lysimeter group data and the monitoring and control of the lysimeter equipment through the platform.(4)The deployment,testing and application of the distributed lysimeter group data management system are conducted after the system has been designed and achieved.The practical application results of the Xinjiang Institute of Biosciences of the Chinese Academy of Sciences show that the distributed lysimeter group data management system has good performance and can meet the requirements on querying and management of lysimeter group data.