Soil Characteristics Of Coastal Saline Soil And Its Growth Mechanism

Land resources are irreversibly lost and degraded due to population and activity and the pressures of climate and land-use change.Soil salinization is a major threat in the context of land degradation.Salinization in coastal areas is different from traditional saline-alkali land indices and needs further study.Therefore,this paper takes the saline soil in the coastal area of Hangzhou as the research object,and studies the soil physical and chemical properties in the salinized area of Hangzhou,and analyzes the salt content,nutrient factor content and heavy metal ion content of the soil at each sampling point in the target area.Component analysis,correlation analysis,single factor quality index method and Nemero pollution index method were used to analyze the statistical results.On this basis,according to the content of these factors and the principal component analysis of sampling points,the degree of salinization in the area of the main point of the eastern part of the Yangtze River is judged.Combined with the soil vegetation data,the characteristics of land salinization in Hangzhou are comprehensively explored.The impact of vegetation generation,summarizing the impacts of diferent land use types on soil salinization in coastal areas,and providing suggestions for vegetation growth in coastal areas to improve soil management in the area.The results shows that:(1)Through the analysis of the physical and chemical properties of soil salinization in different regions and different utilization methods,Na+ and K+ are the main cations of the study area,mainly Na ions,which cause the total salt content in this area to be high.The low available potassium content is one of the reasons for the poor growth of vegetation in the study area.(2)By comparing the regional background values of heavy metals in the soil,the study found that different regions and different utilization methods did not cause heavy metal pollution in the soil.At the same time,the single-factor quality index evaluation method and the Nemero pollution index evaluation method were used to study the soil environmental quality of the study area(The analysis of heavy metal pollution status shows that the soil environment quality in the saline area is good and it is not obviously polluted by metal pollutants and pesticides).(3)Principal component analysis was used to analyze the heavy metal content and soil physical and chemical properties in the study area.The results showed that Cd,Cu,Pb,Zn,TN,TP and SOM have cormon sources.Strong human activities,such as the application of pesticides and fertilizers;the content of Zn ions is obviously related to the content of Pb,available copper,Cu and Cr.According to the previous point,there is no heavy metal pollution in the soil,but the heavy metal content in the soil is still on the soil.The physical and chemical properties have a related impact and affect the vegetation growth mechanism.(4)Through CIRCOS Circular,the relevant data in soils in different regions and different utilization modes are visually analyzed.The results show that the two utilization methods of forest land and agricultural land can improve the physical and chemical properties of coastal saline soil.The growth of the soil is greatly inspiring.We can improve the soil in the eastern part of Hangzhou by planting salt-tolerant forest land and fertile crops.(5)Through the analysis of the microbial community types in the soil,the results show that there are many kinds of microbial diversity in the soils with high organic matter content in the early development areas and agricultural land,and microbes are another important factor affecting the growth of vegetation.(6)Through the survey of vegetation diversity in the area we studied,we found that the soil properties affect the diversity of vegetation.There are many types of soil vegetation with high organic matter content in the soil,and vice versa.At the same time,we can also say the diversity of vegetation.The salinity in the soil is improved,and the action of microorganisms increases the organic matter content in the soil,which greatly increases the diversity of vegetation growth.Therefore,one of the best strategies for salinized soil remediation is to properly select crops and farming systems.Based on the above results,we can conclude that the overall ecological environment quality of Hangzhou coastal area is generally affected by salinization,but salinization is a general trend in the region.Therefore,Hangzhou coastal area can plant a large number of salt-tolerant vegetation to improve the physical and chemical properties of the soil.