Research On The Influence Of Lime On Soil

Urban landscape projects, beautification of the urban landscape, improve the urban microclimate, suitable for urban household work, study and living environment, has an irreplaceable role. The past 20 years, with China's economic and social development, scale development projects across the country, the construction industry flourished. In recent years, due to the rapid development of construction industry in many garden green construction project also is an important content of the works. However, due to the current course of construction, the construction of normative level is not high, construction workers and environmental protection awareness is not strong, the existing land surface mature enough attention to the protection of soil and typically cause more severe pollution, construction waste, and construction waste on the soil pollution is mainly includes lime on soil pollution. After construction, a large number of lime residue was left in situ soil surface, mixed with the soil surface of the planting soil, changed the original soil physical and chemical properties. Previous experience shows that a large number of green plants, mixed with lime in the soil will cause substantial increase in soil pH, a "burn seedlings" phenomenon, resulting in the death of plants planted, so the survival rate decreased.At present, the landscape construction team for the lime treatment of contaminated soil are usually direct measures of extreme green measures by foreign soil, which not only resulted in wastage of natural resources, but also makes the project costs, benefits reduced. In this paper, simulation studies to determine the quality of lime mixed with different types of soil, soil physical and chemical properties of various changes and trends in the area of landscape analysis of the data to determine a more reasonable response to different soil lime content measures to conserve natural resources and increase economic efficiency. Lime mixed with the soil, the soil physical and chemical indicators of the significant changes produced results show that: with the increase of soil lime content, clay and sandy soils are two kinds of soil bulk density occurred after the first increase in the trend of decreasing , porosity, capillary porosity, natural water content, field capacity, capillary water holding capacity, saturated water at first increased and then decreased both the trend. Among them, the critical point of change in clay content of 5% lime, sand soil changes in the critical point for the lime content of 3%. By using SAS software to analyze data, gain the lime content and soil porosity changes in relations between the highly significant, and the relationship between soil water content was significant. Total salt content of lime in the water-soluble, Ca2 +, Mg2 + and pH in the early increased significantly over time there will be downward trend; CaCO3 content of soil from the start of the rapid increase of lime mixed into a slow, and finally gradually stabilized; lime Quality of the clay longer extent of its chemical properties change more.The experimental data and landscape engineering together to get the right amount of lime not only will not affect the normal growth of plants, but also up to the soil (especially the sticky soil) Improvement. However, excessive lime if the soil began to desertification, pH increased rate increase, no longer suitable for plant growth in general, clay lime content below 5%, and lime mixed with the soil for more than 1 month after, not the normal growth of plants affect more than 5% after the soil will destroy soil structure on plant growth and survival of seedlings have a negative impact, and this impact will be because the lime content increases, the trend gradually significant. Ash content of sandy soil on plant growth of the critical value of 3%, lower than the clay.Early in the mixed lime soil will lead to soil salinity, pH and other indicators of the rapid rise, if the planting time is generally very difficult to survive. Because the active ingredients of lime gradually degrade over time, so seedlings planted in soil mixed with lime after the longer, and also artificially contaminated soil for lime deep plowing and other measures to make contact with the air of CO2, accelerate the degradation speed.If the lime content of the soil too much, cause serious soil desertification, due to their occupation of a certain volume of lime to the soil reduced, thus reducing the absolute soil moisture content, often to the city plant water stress increased, especially in early spring water shortage The early spring is usually a critical period landscape, most of the seedlings in early spring planting time in selection, it is for this reason that led to the death of seedlings planted. Good improvement measures is to add some acid reduce soil pH, while adding chicken manure, cow dung and other organic fertilizers to increase the gap and soil nutrient content in soil and increase the relative moisture content.