Research On Growth And Physiological Characteristics Of Camellia Oleifera In Lead Nitrate Stress

To character the growth and Pb enrichment properties of Camellia oleifera under Pb polluted soils,the growth characteristics,the various organs of nutrient uptake and allocation,photosynthetic.the Pb content and enrichment of various organs of one-year-old C.oleifera seedlings were investigated under different Pb treatments in acid purple soil,alkaline purple soil and alluvial soil in western Sichuan.We also analyze the tolerance and transfer efficiency of C.oleifera to Pb pollution and provide a scientific basis for soil repair in by native woody plants on the Pb contaminated.The results showed:Pb significantly affected the growth characteristics of C.oleifera.Low concentrations of Pb increased leaf length and leaf area,while high concentrations of Pb significantly inhibited leaf'length and leaf area.Leaf chlorosis and wrinkle is not obvious under low Pb treatment,Leaf chlorosis and wrinkle increased under high Pb treatment.Low concentrations pr(omoted the stenm of C.oleifera longitudinal growth while high concentrations inhibited the stem longitudinal growth.Low concentration promoted the stem lateral growth while high concentration of Pb inhibited stem lateral growth.Pb stress obviously changed the root/shoot ratio of the sampling,s and increased leaf'litters.The total biomass was decreased significantly(P<0.01)with the increase of Pb stress.The Pb tolerance indices of C.oleifera samplings were from 0.61 to 1.07.depending on Pb stress and soil substrates.The tolerance index decreased with the increase of Pb stress.The enrichment and transfer efficiencies were lower than 0.3 and was rapidly decreased with the increasing Pb stress.This study to the cedar lead resistance index of principal component analysis,the first principal component contributioin rate of 82.917%,the second principal component contribution rate of 15.955%,in combination with cedar resistance to heavy metal polluting subordinate function analysis it is concluded that the CK,T1,T2,T3,T4,0.6988,0.5036,0.3865,0.2915,respectively.Cedar seedling characteristics of lead resistance sorting for T1>CK>T2>T3>T4.