Study On Precision Planting Division Of Wheat And Maize In North China Plain Based On GIS

Accurately identifying agricultural production environment information and agricultural production characteristics,and comprehensively classifying multi-source data such as meteorology,soil and crops are the basis for improving agricultural resource utilization efficiency and optimizing agricultural planting structure.However,in recent years,global environmental changes have affected the stability of the environment,directly affecting agricultural production,which has led to many ecological and socio-economic problems including food security.Therefore,in order to improve the ability of agricultural production to respond to environmental variability,this paper accurately analyzes the wheat cultivating zoning from the perspective of time and space for the existing planting structure.As the main grain producing area in China,the North China Plain has a very positive and practical significance for guiding agricultural production and optimizing industrial layout.The ultimate goal of this paper is to complete the spatiotemporal planting zoning of wheat and corn in the North China Plain.The main research work includes:1.The meteorological indicators are selected by consulting relevant literatures,and finally confirmed the main climate impact factors during the growth period of wheat are rainfall,greater than 0 ? accumulated temperature of activities,lower than0 ? accumulated temperature of activities(negative accumulated temperature),the amount of solar radiation,and the average temperature of the coldest month,the main climate impact factors during the growth period of maize are rainfall,greater than10 ? accumulated temperature of activities,sunshine duration,and the amount of solar radiation.2.Based on the data of 69 meteorological stations in the North China Plain in the past 20 years,this study constructed a database of many years of environmental characteristics in the North China Plain.By using the spatial analysis method,the multi-year spatial distribution map of environmental characteristic elements isobtained,and the seven meteorological indexes all have significant spatio-temporal changes.3.Combination of 495 counties of corn and wheat per unit area yields data,by using the entropy weight method to calculate the weight of each index,spatial integration clustering of various indicators using ISOData clustering algorithm,to realize the purpose of fine planting zoning,the summer maize and the winter wheat planting in the North China Plain is divided into five categories: the extremely unsuitable area,the unsuitable area,the relatively suitable area,the suitable area and the extremely suitable area.4.Through the analysis method of environmental category attribution,each category is divided into five subcategories.And the relative stable regions of corn and wheat with a probability of greater than 75% are statistically analyzed,accounting for about 63% and 90% of the total area respectively,and the fluctuating region with a probability less than 75% accounts for about 37% and 10% respectively.The extremely unsuitable area,the unsuitable area and the relatively suitable area in corn growing areas,the three types of space-time distribution are relatively stable,and the areas with the attribution ratio of 100% account for 87.67%,70.41% and 84.28% of each type of area respectively.The fluctuation area mainly occurs in the suitable area and the extremely suitable area,and between the extremely suitable area and the relatively suitable area.For wheat,the extremely unsuitable area,the relatively suitable area and the suitable area,the distribution of the three categories has also been relatively stable in the past 20 years,and the areas with the attribution ratio of100% account for 87.14%,73.74% and 74.79% of each type of area respectively.The fluctuation area mainly occurs in the relatively suitable area and the extremely suitable area,and between the extremely suitable area and the suitable area.This study analyzes the wheat and corn production environment information in the North China Plain from the perspective of space and time.Based on this,the fine division of wheat and corn in the north China plain was constructed,which has important guiding significance for improving the local resource utilization efficiency and optimizing the industrial layout.