Spatial Distribution Characteristics Of Soil Nitrogen Content Of And The Impact Factors In Sichuan Tobacco-growing Areas

Sichuan is a province in the country’s tobacco production, Liangshan, Panzhihua, Guangyuan, Yibin and Luzhou, as the province’s five largest tobacco area is very suitable for growing tobacco. Studies have shown that soil nitrogen fertility as an important part of its production, the level and quality of tobacco has important links. Although there have been abroad for higher studies of soil nitrogen, but the research progress of tobacco soil fertility status and more concentrated in the impact on the yield and quality of tobacco, the study methods and more traditional statistical method text description of the overall situation and ignore the use of local features, and research mostly medium and small scale mainly the lack of large-scale studies. Therefore, the study of the Sichuan region of tobacco planting soil nitrogen content of soil studies, both reveal the spatial variability of soil nitrogen in tobacco planting area in Sichuan and mastered its distribution, to achieve the sustainable use of soil and sustainable Tobacco development provides assurance; reasonable fertilization but also for tobacco, tobacco implement nutrient partition management, effective control of nutrient runoff and pollution tobacco provide a scientific basis. This study supports the theory of geostatistics and "3S" technologies, conduct soil nitrogen content Sichuan tobacco growing area study spatial variability, and to analyze the impact of factors make detailed findings and recommendations for tobacco control measures to optimize and protect the agricultural environment reference. The main results are:(1) Sichuan major tobacco-growing areas of alkali solution on the nitrogen content is generally the middle, with an average maximum of Luzhou Tobacco 125.18 mg/kg, the lowest Guangyuan Tobacco 97.39 mg/kg, and there are different degrees of variation, which variation in the range of 17.06%-46.13%;(2) Sichuan major tobacco-growing areas of soil nitrogen content distributed spatial correlation was moderate (25%<C0/(CO+C)<75%), structural factors and random factors both have a certain degree of spatial variability effects, namely topographic factors, soil factors, weather factors and farm management factors within the study area are distributed with varying degrees of impact on the tobacco-growing areas of soil nitrogen content and space;(3) of the Main tobacco soil nitrogen content space segment differences, including soil available nitrogen content of Liangshan from west to east was a growing trend; Panzhihua was increased gradually from south to north trends; trends in Luzhou City is from east to West gradually increased; Yibin showed increased gradually from north to south; while showing tobacco Guangyuan edge of soil nitrogen content was higher than the center of the characteristics;(4) Liangshan Tobacco climatic factors and their annual rainfall was a significant positive correlation between the slope factor topographic factors, irrigation capacity of the soil factor topsoil thickness and field management of its greater impact; Panzhihua Tobacco climatic factors and its annual rainfall was extremely a significant positive correlation between the annual and perennial frost and its effective temperature was a significant negative correlation between the slope and the slope of the ground terrain factor factor factor irrigated soil type and capacity of the soil to its field management greater impact; Luzhou tobacco climatic factors perennial its rainfall was significantly positively related to its effective temperature all year round was a significant negative correlation between topography and drainage capacity factor slope ground slope factor, soil types and soil factors in its field management greater impact; Yibin tobacco climate its annual rainfall factor was a significant positive correlation between annual and perennial frost and its effective temperature was a significant negative correlation between topography and drainage capacity factor slope, soil texture and field management factor to its greater impact; Guangyuan smoke climate its annual rainfall factor was a significant positive correlation between the annual effective accumulated significant negative correlation was its terrain factor slope, soil type and soil factors drainage capacity of its field management greater impact.