Soil Fertility Quality Evaluation Of Slope Land In Cinnamon Soil Region Of Liaoning Province

Different land use methods are affected by artificial farming activities and natural factors,which are prone to soil erosion,resulting in poor soil and reduced productivity.Cinnamon soil is the main tillage type soil in Liaoning Province.It is mostly distributed in Chaoyang City,Liaoning Province.Chaoyang City is a model city for the management of brown soil slope.Its unique mountainous terrain makes the area of slope area mostly,although it has been partially Soil and water conservation measures are adopted on the slopes,but most of them are still not treated,and a large amount of soil is eroded every year.In view of this,the research area was selected in Beipiao City,northeast of Chaoyang City,Liaoning Province,to provide theoretical basis and suggestions for improving soil quality and rational use of land in the brown soil area.In order to grasp the soil nutrient content of the cinnamon soil research area,explore the intrinsic and extrinsic factors affecting the soil fertility quality change,and explore the difference of soil quality under different land use patterns on different slopes of the brown soil area.The paper uses two kinds of slopes as the research plots,and reveals the changes of soil properties under different conditions through the comparison of different land use types,soil depths,slopes and slope positions.Based on the establishment of the minimum data set of the soil evaluation index system in the study area,the soil quality degradation index method and the soil quality comprehensive index method were used to evaluate the soil quality in the study area,and the evaluation method most suitable for the area was selected.In order to further monitor the soil quality in the study area,the soil in the study area was sampled and analyzed at the same time in 2017 and 2018,and the soil quality comprehensive index was calculated.The soil quality was divided into five grades,and land use and management were proposed.Rationalization proposal.The paper has the following main conclusions:?1?The physical and chemical properties of the study area are as follows: the bulk density value is between 1.308 and 1.413 g·cm^-3,and the slope increases the bulk density.The p H is between 7.844 and 8.04,and the p H value increases with the depth of the soil layer.The water content is between 6% and 11%,and the water content increases with the decrease of the slope position.The conductivity value is between 0.053 and 0.150 ms/cm.The salt content decreases with the increase of the slope,and the salt content increases with the decrease of the slope position.The content of organic matter was between 7.414²7.171 g·kg^-1,the content of alkali nitrogen was between 39.774⁶9.100 g·kg^-1,and the content of available potassium was between17.857²8.917 g·kg^-1.The content ranged from 4.253 to 181.312 g·kg^-1,the total phosphorus content was between 2.463⁴.474 g·kg^-1,and the total potassium content was between 18.35²0.45 g·kg^-1,among which organic matter and alkali were present.The contents of nitrogen,available potassium and available phosphorus decreased with the increase of slope and soil depth,and the organic matter decreased with the decline of slope.The soil nutrient content under different land use patterns was significantly different.?2?Comparing the changes of soil index content in different periods: soil bulk density,p H value,electrical conductivity,total phosphorus and total potassium content did not change significantly;in October 2018,soil moisture content decreased by 46.7% compared with October 2017;The content of alkali nitrogen decreased by 12.9%,and the contents of organic matter,alkali nitrogen,available phosphorus and available potassium increased by 13.9%,12.9%,60.3% and 37.9%,respectively.?3?Constructing soil evaluation index system by principal component analysis method: The soil evaluation indexes selected for entering MDS in 2017 are total phosphorus,total potassium,available potassium,organic matter,p H and conductivity;the soil evaluation index for entering MDS in 2018 is Soil p H,organic matter,water content,available potassium,total potassium,and alkali nitrogen.The soil quality index of the study area was calculated by using the soil quality comprehensive index and the soil quality degradation index method.The comparative analysis showed that the soil quality comprehensive index was used to evaluate the soil quality of the study area.?4?Comprehensive evaluation of soil quality in the study area: The i₁ forest land,i₁ cultivated land,i₁ wild grassland and i₂ cultivated land in the study area are all in the soil quality level ?,and the i₂ forest land is reduced from the grade ? soil quality to grade ? from 2017 to 2018.Soil quality,i₂ grassland increased from Grade ? soil quality to Grade ? soil quality.The soil quality of slopes from 2° to 6° is generally in the soil quality level of Grade ?,and the overall quality level of slopes from 6° to 15° is in the soil quality level of Grade ?.It can be seen that the greater the slope,the lower the soil quality.From the overall soil quality level in the brown soil area,the overall soil quality index of the cinnamon soil research area in October 2017 was 0.336,and the overall soil quality index of the cinnamon soil research area in October 2018 was 0.346,both of which were in the soil quality level ?.The overall quality of the soil in the study area is at a low level and cannot reach the optimal nutrient content level of crop growth and development.By introducing the slope topographic factor and combining different land use and slope to analyze the influencing factors of soil quality change,the paper analyzes the change of soil quality from multiple angles,and to some extent avoids farmers' understanding of soil quality.Land management and land use optimization proposals to help guide farmers to fertilize and deploy appropriate soil and water conservation measures have positive significance for improving soil structure,improving land productivity,and achieving sustainable development of resources and environment in the region.