Spatial Distribution Of Soil Available Silicon In Cultivated Lands And Its Influencing Factors In Conghua District,Guangzhou City

Soil available silicon can reduce the effects of biological and abiotic stress on crops and enhance the stress resistance of crops to improve grain yield.Therefore,it is of great significance to explore the distribution characteristics and influencing factors of soil available silicon in the top layer of farmland to further improve rice yield.This article choose guangzhou conghua district as the study area,a total of 204 farmland top layer soil sample data,soil effective silicon content is obtained by laboratory analysis data,soil elements such as land use statistics to draw farmland systems were significantly different effective silicon of spatial distribution of soil in the study area,and analysis on the different dimensions of farmland arable layer soil effective silicon.Then based on the digital elevation model and remote sensing image to obtain the corresponding terrain factor and NDVI,to comprehensive analysis on natural environmental factors and the relationship between the soil effective silicon,using correlation analysis,variance analysis and importance,discusses the influencing factors on top layer of soil effective mechanism of action of silicon and influence degree.The main conclusions of this study are as follows :(1)the distribution range of available silicon content in farmland topsoil in the study area is 7.55~137.72 mg kg-1,with an average content of 60.31 mg kg-1,and the overall level is relatively low.(2)in the study area,the content of available silicon in the topsoil of farmland is higher in the area around the urban center and in the area with good ecological environment,and the content is lowest in the area with orchard as the main land use mode.Meanwhile,the content is higher in the western hilly area,followed by the liuxi plain area,and lower in the mountainous area.(3)the factors affecting the available silicon in the topsoil of farmland in the study area include land use mode,soil p H,soil organic matter content,soil bulk density,soil clay content and soil parent material,among which the parent material of soil is the most important.