On The Relationship Between Urban Afforestation Tree And Urban Soil Quality

Urban afforestation tree plays a crucial ecological role in the fragile city ecosystem.However, there is a distinct declining tendency in the growth of urban afforestation tree inrecent years. According to relevant research and investigation, the declining tendency inthe growth of urban afforestation tree is largely due to soil quality in city. The developedurbanization has greatly changed the quality of urban soil . Urban soil trends to be covered,having tight reality degree, big unit weight, bad structure, high soil temperature, and oftenlacks of nutrient and severely polluted. The declining and partial disappearing of urban soilecological function will damage the ecology merit of urban afforestation tree inevitably.The purpose of this paper is to explore the relationship between the urban soil qualityand the declining tendency in the growth of afforestation tree, to select a typical andoperational soil property evaluation item, based on established theories and methods, tocreate an integral evaluation system which grads urban soil.To evaluate the indexes ofnorthern soil(mainly in Beijing and Changchun) with the approaches like one factorevaluation, many factors evaluation, synthesizing evaluation, etc. and to analyze anddiscuss the results in light of the actual growth tendency of urban afforestation tree.This paper aims to plan and improve the city greenry patches by evaluating urban soilproperty in light of the study on the relationship between soil property and afforestationtree. Considering the actual condition of soil and varieties of afforestation tree, we canimprove the soil structure and the nutrient characteristic with clear target, and better thegrowth condition of afforestation tree with scientific methods.For the moment, the research method that sees the growth condition of afforestation treein light of soil characters is still under experiment. In this paper, the writer tries to makefull use of current research results, and proposes a relatively systematic afforestation treesoil evaluation system. Hopefully, this system will be able to act as the theoretical basisand scientific guidance for planning city greenty patches.