Studies On Soil Of Changchun Chaoyang District Vegetationg

Changchun jilin province, northeast Asia economic zone as heartlands. In recent years rising urban construction of strength, especially with the industrial expansion, business and the development of tourism and the increase of population, industrial "three wastes", vehicle exhaust gas and living garbage, the increase of sewage to changchun city green land soil physical and chemical properties, has brought great effect of soil heavy metal content increased, soil enzyme and microorganism biochemistry to effect change significantly.This paper soil sampling chaoyang district changchun city green, green, according to different types of sampling is divided into:small green, campus green, green space, park green space, square street road greenbelt,5 kinds of sample area, each sample area of typical delegate, select three of 150 sampling points. For these sample point test, experimental results show that:The size of the soil bulk density order:street> square>community>campus>The park. The Soil porosity size order:park>campus>community> square>street. The size of the soil moisture content in this order:park>square>campus>community> street, Park green space, soil moisture content is higher, because park green space of plant community complex, local form peculiar microclimate, appropriate vegetation growth, sunshine is difficult to through the thick plants to the ground, reduce directly on the surface of water evaporation; The street road greenbelt soil water cut is low, plants absorb moisture imbalances, easy cause plant growth undesirable, leaves early, appear even death. In soil particle composition to 0.05～1mm the highest levels of the grain of level accounted for 50%.<0.005 mm grain, the least second grade content is 0.005～0.05 mm.0.05～1mm grain size of grade levels in this order:street>community>campus>square>park,0.005～0.05 mm grain size of grade levels in this order:park>campus>square>community>the street road,<0.005 mm grain size order:grade content:park>square>campus>community>the street road, Park green space soil physical sand, less physical viscous particle much, is due to park green space most the soil quality is good, the outside intrusion body less, plant root in the soil of secretions within the activities for microbes, have created favorable conditions, thus speeding up into soil and weathering. Soil organic matter size order:park>campus> square>community>street. The size of the available nitrogen in soil order:park>square>campus> community>street. Soil organic P size order:park>campus>square>community>street. Soil organic P size order:park>campus>square>community>street. Soil rapidly-available potassium size order:park> square>campus>community>street. Soil organic matter content is too low, N extremely short, mild phosphorus deficiency, basic not k deficiency. The main reason is:Branches of trees because affect the city off the environment and health, are the sanitation workers cleaned clean, this directly blocked plants and soil nutrient cycling, between the soil nutrient not complement, organic matter content decreased year, so the soil physical and chemical properties of soil becomes poor, cause the fertility decline. In this soil environment from the plant, can only grow under the condition of limited nutrients, leading to absorb nutrition tree growth, bad, grew poorer[74]. Soil pH size respectively is:street>square>community>campus>park. The content of soil heavy metal Cu order is:street>square>park>campus>community. The content of soil heavy metal Zn order is:district>park>street>square>campus. The content of soil heavy metal Pb order is: street>square>park>campus>community. The content of soil heavy metal Cd order is:street>square> park>campus>community. The urban green land of heavy metals in plant cell migration will make to plant growth affected, which also affects their growing. The accumulation of Pb in plant body can lead to photosynthesis, REDOX reaction and fat metabolism intensity is abate, simultaneously also may lead to oxygen consumption increase and decrease the uptake of water, which hinders plant growth, even caused plant's death. Cd is toxic elements, immediate harm plant growth, if soil Cd content is exorbitant, the plant leaf chlorophyll structure will be destroyed, reduce root to nutrient and moisture absorption, thus inhibiting the root growth, causing plants grow slowly and affect beautiful. Enzymes are protein is high catalytic activity of the catalyst, more creatures. Catalase in soil in different green space type basically no bigger difference, the floating, so it is less affected by environmental medium change, can not use its about types of soil environmental change green instructions. Protease in different soil types of green size:park>campus> square>community>street. Amylase in different size of green land for:park>school=square> community>street. Polyphenol oxidase in different soil types the size of green for:street>community> square>campus>park. The urban green land use means for all types of different soil enzyme activity is affected by pollution, soil once the soil enzyme activity will be affected. Soil microbial biochemical role strength including Respiration, Cellulose decomposition, Ammoniation role, Respiration intensity expression is:street>square>community>park>campus, From each function, soil respiration size by environmental stress that the more serious, the soil respiration, the more serious the outside pollution by soil disturbance, the environment is different cities, this reflects a function of soil polluted green degree. Soil microbial metabolic contractor performance is:street>square>community>campus>park. Soil Cellulose decomposition strong: park>campus>community>square>street. This is because in the long run, park greenbelts soil ecological climate stability, localized small human disturbance is less, the microbial community species diversity, cellulose decomposition high strength. Soil microbial ammoniation role performance:park>campus> community>square>street. For that, through the moisture in the soil, became well ammoniation function is higher. Caused by artificial activities urban green space changes of soil physical and chemical properties of soil microbes, led to significant effects of abnormal microorganism activity, make the life activities of microorganism is restrained, thus causes soil fertility is abate, inhibit the plant's normal growth and development, affects the city appearance.City in the garden plants grow in different types of green land, and different green land has its own characteristics and into soil environment, so plants in different soil types of green also has growth state difference. Soil physical and chemical properties of the park green space is good, plants grow good condition, diseases and insect pests, less a lower mortality; The street road greenbelt soil physical and chemical properties of the worst, plant diseases and insect pests grow weaker,, mortality is taller.