Populus Tomentosa Populations Repair Effects Of Soil Heavy Metals Pb, Cd Pollution

By examining the heavy metal Pbu Cd content of the soil, the sewage and the Populus tomentosa Carr leaves which are collected from the south suburban of Beijing city, the experiment results indicates that near half of the soils in this area are suffered light or above light level heavy metal pollution. Moreover the heavy metal pollution of near 20% of the soils is serious, and this situation is possible to be extended and exasperated. The spatial distributing of the different pollution level in soils take on the status of obvious point maximum, plane expansion and line extension.The research analyzes the tree height growth and the tree stock growth of the different tree age and find that the growth situation of the Populus tomentosa Carr that grew in the heavy metal PK Cd polluted soils is in gear. This statistics prove that the Populus tomentosa Carr can be used to mediate the heavy metal polluted soils as a special plant.The root of the Populus tomentosa Carr is belonged to the horizontal slanting root type. The root distributing in soil is consistent with the PK Cd distributing in soil. So the Populus tomentosa Carr could be easy to absorb the Pb Cd hydronium in the topsoil and fix up these in the plant body. The research demonstrates that the Populus tomentosa Carr have the function of mediation the heavy metal polluted soils.By making full use of the phytore-mediation function of the Populus tomentosa Carr, we could adjust measures to local conditions and design different and effective ecological engineering patterns, such as the ecological protection woods,the young plant woods, the intercrop of the crop and the Populus tomentosa Carr, the cropland defense woods and so on.