| Soil is the loose layer of green plants growing on the earth’s surface.It is the material system formed and developed under the comprehensive action of biological,climatic,topographic and other factors of rock weathering.It provides necessary and abundant material conditions and environmental conditions for the growth and development of animals and plants,and is also the natural resource for human survival.Soil is the main component of ecological environment,and it also plays an irreplaceable role in agricultural land.In agricultural production,agricultural land is the material basis of crop production.The quality and safety of agricultural land soil is directly related to the safety of agricultural products and human health,and plays an indispensable role in maintaining social stability and human survival and development.Soil quality is the main index to ensure soil ecological safety and sustainable utilization of resources,including soil fertility quality,soil environmental quality,soil health quality and other factors.Unbalanced organic matter content in the soil,excessive use of chemical fertilizers and excessively high alkalinity in the soil will all lead to the decline of soil fertility,which will lead to the decrease of high-quality fields,the increase of low-quality fields and the degradation of agricultural land,etc.,thus giving rise to a series of environmental problems and aggravating soil pollution.At the same time,problems such as small scale,high cost,unscientific fertilization ratio and structure,and backward management methods of traditional tillage lead to soil quality decline,crop yield and quality decline and soil environmental damage,which will eventually hinder the sustainable development of agriculture and seriously harm human health and survival.Soil tillage in agricultural land directly affects its physical and chemical properties,and physical and chemical properties are important factors affecting crop growth and development,yield and quality formation.Therefore,studying soil physical and chemical properties can comprehensively understand the current situation of agricultural land.In this paper,from the collection of 40000 points in the study area soil samples screened 1747 representative points in the experiment,through the comparison method,analysis of organic matter,PH,soil texture,soil configuration,soil thickness,soil porosity,etc.A total of more than 20 indicators,the system to explore the reality of soil sample,sorting problems,and puts forward improvement Suggestions,for the future to soil science research,agricultural land evaluation,planting layout adjustment and provide data base materials such as the ecological environment protection.The conclusions are as follows:(1)In the past 40 years,the soil PH value decreased by 1.2 percentage points,and the average PH value from high to low was as follows: white slurry brown soil > tide brown soil >brown soil > typical brown soil;The average PH value from high to low is: orchard > vegetable field > grain field;The average PH value of loamy soil from high to low is: medium loamy > sandy loam > light loam.Generally speaking,soil acidification is more serious.(2)The contents of organic matter,nitrogen,available phosphorus,potassium,calcium,magnesium,sulfur and other chemical elements in the study area were low,which decreased to different degrees compared with the second national soil survey.(3)In the study area,soil surface texture,soil thickness,soil capacity,soil configuration,soil porosity,etc.are significantly different from the results of the second national soil census,with different degrees of decline.(4)In view of the soil problems in the study area,the comprehensive use of technology,management,funds and other means to increase soil governance efforts to improve the soil environment. |
PDF Full Text Request