| With the development of science and technology, the production activities of humanbeing caused the quality of our environmental degradation which it is an urgent issue needto be solved. And soil heavy metal pollution is one kind of serious environmental problemcontemporary, so what kind of solution about soil heavy metal pollution has become thefocus of the world at present. In view of the soil heavy metal pollution maybe the factoraffecting the quality of soil and crop production, and it maybe indirectly impactedgroundwater and surface water or even the whole ecological environment, which isdefinitely harmful for mankind’s health, so finding the right way about contaminated soilrestoration is extremely important. In this paper, using the phytoremediation technology toobserve the effect of the soil heavy metal cadmium pollution, systematic understand theinfluence of soil texture, carbon nitrogen ratio and organic matter with soil cadmiumpollution in Solanum nigrum L. was supplied for experimental plants under the pottedcondition. Meanwhile, this paper also studied the consequence in the situation of underchelating agent on soil exogenous Cd pollution exclusively and situ Cd pollution soil thatsupplied experimental plants assimilated soil heavy metal Cd, specifically, which the effectof on the ground and the lower, concentrations of heavy metal Cd, soil available Cdcontent and aboveground biomass to plant.The results showed when it was at the same concentration of Cd on different soiltextures, carbon nitrogen ratios, soil organic matters and chelating agents, the overgroundand underground part of Cd content in dry biomass and enrichment coefficient manifestedsandy>clay>loam soil,25:1>35:1>15:1,2%>4%>6%and EDTA>EDDS>contrast,respectively, but the highest content of Cd in plant were loam,25:1of carbon nitrogenratios,6%organic matter and EDTA; Soil available Cd content were clay>loam>sandysoils,25:1>35:1>15:1,2%>4%>6%and EDTA>EDDS>contrast, respectively,aboveground dry biomass of loam, carbon nitrogen ratio of15:1, organic matter6%andcontrast of chelating agent treatments were the highest. At the same situation of soilproperties and chelating agent, with the added exogenous Cd content increased, except forclay, sandy soil, other treatments increased at first and decreased afterwards, that the overground and underground part of Cd content in plant and soil available Cd contentraised as well, but enrichment coefficient of Cd decreased, which illustrated that when itwas in the concentrations of Cd greater than20~40mg kg-1, it influenced the quantity ofthe growth in Solanum nigrum L.Among the sandy, clay and loam soil, the enrichment coefficient range of Cd contentin plant of overground and underground respectively were60.14~0.55,90.83~0.46,142.22~0.67;16.94~1.10,58.17~1.02,99.26~1.25, carbon nitrogen ratios were93.67~0.61,111.83~0.69,110.17~0.69;37.50~1.04,50.33~1.17,58.00~1.12, organic matters were84.44~0.43,78.74~0.42,76.06~0.41;54.51~1.00,51.07~0.97,49.79~0.95, chelating agenttreatments were90.83~0.46,113.70~0.57,113.28~0.54;58.17~1.02,68.22~1.27,64.94~1.23.At the circumstance of situ pollution soil, the overground and underground part of Cdcontent in dry biomass, soil available Cd content and enrichment coefficient of Cd intreatment1(Cd, Cu pollution) and treatment2(Cd, Pb, Cu and Zn pollution) all showedEDTA>EDDS>Contrast, and aboveground biomass of treatment1and2manifestedContrast>EDDS>EDTA. |
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