Study On Culture And Properties Of Heavy Metal Accumulated Wood In Poplar

This experiment is based on the plantation 69 Yang,which is rich in heavy metal Cd.Formulating different concentrations of heavy metal Cd soil,In the case of the same environmental conditions,By setting the two growth states of poplar,the upright growth and the artificial force tilting are used to simulate the process of absorption and enrichment of Cd by normal wood and Tension wood,under the condition of heavy metal Cd contamination.Using heavy metal measurement techniques and microstructure image processing techniques to observe and study the discovery of different concentrations of heavy metal Cd treatment,Poplar normal wood and Tension wood absorb and enrich the process of heavy metal Cd,Study the relationship between Cd content and growth traits,anatomical features,and ultrastructure,The research results are as follows:1.The increase of tree height under the treatment of heavy metal Cd in 50mg/kg and 100mg/kg in normal wood is lower than that in the control group.The treatment of heavy metal Cd at 5mg/kg and 50mg/kg in pull wood has the greatest impact on tree height.The rate of 8.57%and 7.1%was higher than that of the control group.The change of the height of the heavy metal Cd treated with 20mg/kg was the smallest;the Cd of different concentrations affected the diameter of the poplar,and the inhibition was most obvious at the concentration of 5mg/kg.2.The ratio of fiber content in erect growth poplar tissue was significantly different under different concentrations of heavy metal Cd.The tissue ratio of erect poplar and the tissue ratio of artificially inclined poplar under two growth conditions The amount has a significant difference.The ratio of normal wood and wood ray is greater than that of the wood to be pulled.The normal amount of the wood is less than that of the wood.The normal fiber ratio is greater than that of the wood.3.The double wall thickness of upright growing poplar cells treated with different concentrations of heavy metal Cd was significantly different.When the heavy metal Cd was treated with 5mg/kg,the double wall thickness of the top,middle and base was the minimum.4.The difference in length of the erect poplar and the artificially inclined sloping poplar in different growth states is significant.The length of the erect growth poplar is larger than that of the artificially inclined sloping poplar duct,and the same growth state will affect The growth and development of poplar ducts.4.The length of poplar fiber is significantly different under the action of different concentrations of heavy metal Cd,and the difference in the longitudinal position of the puller should be significant.5.The length of poplar tree ray has no significant difference in different heavy metal concentration,different positions in longitudinal distribution and two different growth states:erect growth and artificial tilt.The length of wood ray has nothing to do with these factors.6.In terms of crystallinity,there are significant differences in the crystallinity of poplar under the two growth states of erect growth and artificial force.Under the same concentration of heavy metal Cd,the change of crystallinity of poplar is greater than the medium greater than At the top,under different growth conditions,the crystallinity of the tension wood of 5mg/kg heavy metal should be greater than that of normal wood.The crystallinity of normal wood at other concentrations is greater than that of tension wood.7.The microfibril angle is significantly different under different concentrations of heavy metal Cd and under the two growth states of erect growth and artificial force inclination.When the concentration of heavy metal Cd is 50mg/kg,the microfibril angle is the smallest,100mg/kg.The time is the biggest.8.The content of Cd in poplar decreased firstly with the content of heavy metal Cd in the soil,and it was the highest when the concentration of heavy metal Cd was 50mg/kg.Under the same concentration of heavy metal Cd,the content in the puller was more than normal.In wood,the content of Cd in various organs changed to bark>leaf>root>stem;the content of Cd in tension wood of artificially inclined poplar was larger than that of corresponding area.