| Panzhihua tobacco region was chosen as the study area and Flex was used to build the WebGIS tobacco precise fertilization information system(TPFIS).At first, the development status of WebGIS and fertilization information system at home and abroad were analyzed in this paper, and then ArcGIS Server REST API、ArcGIS API for Flex technologies were applied to accomplish the overall design of TPFIS. With the GIS technology, the basic geographic data and soil sampling analysis results was used to found the tobacco area ecological environment database. Tobacco fertilization model was established according to fertilization modeling theory and field experiment data. Finally, MXML and ActionScript3.0 were used as development languages at the Flash Builder IDE. According to the overall design, the coupling of database and fertilization model was realized, each functional module was developed, network deployment and release were finished, the WebGIS TPFIS was obtained and applied in production. The main results are as follow:(1)Based on Flex framework, B/S layered architecture and component type development philosophy were applied to complete the overall design. B/S model was used to delaminate the system as data layer, service layer, business layer and presentation layer. Component type development principle was used to divide the system function into 4 groups (user login, map operation, precise fertilization and affiliated function),17 kinds of function modules. Basic map operation, information query, interactive fertilization decision-making and facilities management, etc. were covered in system function.(2)GIS technology was utilized to design and establish the ecological environment geographical database of Panzhihua tobacco region. According to the system development demand, the geographical database which contains administrative divisions, fertilization management unit, as well as 15 feature classes, had been built. In the construction process, the GIS functional analysis and spatial statistical analysis were used to excavate the basic data, then Panzhihua tobacco region was subdivided into 7993 fertilization management units. And the ownership, environmental factors and other related property information, more than 200,000 pieces, was obtained. In this way, the accuracy of unit’s spatial information and the uniformity of unit’s environment factor information were ensured.(3)Fertilization modeling theory and expert knowledge were used to build and optimize tobacco fertilization model of Panzhihua tobacco region. The field fertilization experiment data was used and DPS data analysis software was applied to establish a function model of tobacco yield, output value, nicotine and K content of tobacco leaves with fertilization level. And the optimal target application value of N, P, K was obtained in 95% confidence interval, then the fertilization formula of tobacco was worked out after using the multi-objective optimization to solve the value. The recommendation formula of system was obtained with the combination of formula test of two years, investigation data and plots differences. Based on the formula, considering the actual production, expert knowledge and human-computer interaction technology were introduced to optimize the model. The expert experience was transformed into model updating base and the model was optimized with the help of parameter which was transmitted by the human-computer interaction interface options. That ensure the recommended fertilization results are more accurate, more practical.(4)System development and deployment release were finished, based on the coupled mode of vector data database and fertilization model. Geographic data was released into the map service and the corresponding service URL was obtained with the help of ArcGIS Server. Then URL was called in Flash Builder. MXML and ActionScript3.0 programming languages were used to realize the coupling of database and model, to complete the development of each functional module and the interface layout of system. The deployment release of system was published online after debugging. The interface of TPFIS is well-organized. The system runs stably and smoothly. The operation is simple and convenient, and the user experience is good.(5)The practical application effect of TPFIS was remarkable. Practical employments have improved that the distribution range of recommended fertilization results were:5-7 kg/667m2 nitrogen fertilizer,6～9 kg/667m2 phosphate fertilizer,22～25 kg/667m2 potash of Yunyan series, respectively; Honghuadajinyuan was planted in sloping fields or terrace, and the use level of N,P,K fertilizer was 3-5 kg/667m2 nitrogen fertilizer,5～7 kg/667m2 phosphate fertilizer,20～25 kg/667m2 potash. The results conformed to the optimum fertilization scheme of field experiment, which was conducted in Panzhihua. The farmers fertilizered as the recommendation results of the system, the cost of fertilizer saved 42 yuan/667m2 averagely. The internal quality of tobacco leaves was coordinated, and the tobacco yield improved 186 yuan/667m2 averagely. All things considered, the income increased 220 yuan/667m2, which acquired favorable economic and environmental benefits. |
PDF Full Text Request