The Research On Spatial Variability About Soil Nutrient In Improvement And Utilization Pattern Of Northwest Liaoning Sandy Land

There are obvious differences in soil nutrients in different spatial locations.A correct and comprehensive understanding of the spatial variability of aeolian sandy soils is the key to optimizing the management of soil nutrients in aeolian sandy soils,and scientifically fertilizing,increasing crop yields and promoting the adjustment of agricultural production structures.The realization is of great significance.In this paper,based on the high-density sampling data and the combination of geostatistics and GIS technology,the spatial variability and influencing factors of soil nutrients in 38 soil samples were analyzed based on high-density sampling data.The soil fertility comprehensive index method and the interpolation method were combined to quantitatively estimate the fertility quality and grade distribution of the soil in the sandy soil.The results show:(1)The average available phosphorus and total nitrogen in the study area were above the level 3,and the available potassium was slightly lower than the level 3,while the mean values of total phosphorus,total organic carbon and alkali nitrogen in the soil samples were far below the lower limit of the evaluation criteria.The organic matter content is extremely low,the average content is only 0.036g/kg,and the available potassium content in some areas is higher,reaching197.4mg/kg,but the coefficient of variation is higher,reaching 0.46.The median and mean levels of potassium are slightly below the Grade 3 standard and are generally poor.The content of available phosphorus in some areas is relatively high,close to the standard of 1 level,and the coefficient of variation of available phosphorus is the highest,reaching 0.84.(2)The soil nutrients in the study area all have very significant spatial auto correlation,which are caused by structural factors and random factors.The ratio of available phosphorus,available potassium,total phosphorus,organic matter,total organic carbon,and alkali nitrogen content in the range of(0.25,0.75)is moderately variability,while the total nitrogen content of the gold base is The ratio is higher than 0.75,showing weak variability.(3)The high-value areas of alkaline nitrogen,total organic carbon and total nitrogen in the soil of the study area are concentrated in scientific research land and irrigated land.The distribution of total phosphorus and available phosphorus is relatively scattered,with a more complex distribution pattern.The distribution of available potassium content is higher in some parts of the north and lower in most parts of the central part.The land use types of the high-value areas of the two available potassium in the north are scientific research sites and orchards.(4)The soil fertility in the study area has a great correlation with the type of land use.Theoverall fertility of irrigated land,orchard and scientific research land is higher.The IFI index is generally higher than 0.5,but the irrigated land has a higher value,reaching above 0.8.However,the scale of variation is small,and the high-value area is radially decreasing on a small spatial scale;while the overall fertility of arbor forest land,other woodland and grassland is relatively poor,and the IFI index is generally lower than 0.5.The paper has 27 pictures,13 tables,and 101 references.