Effects of Plasticizer on Biomass and Nitrogen Accumulation of Mulberry(Morus alba L.)Seedlings
[Objective]The effects of major plasticizer types on biomass and nitrogen accumulation of mulberry seedlings in mulberry gardens were explored to provide a theoretical basis for later assessment of the ecotoxicity effects of plasticizers on forest trees.[Method]Five exogenous chemical and biochemical reagents(oleamide,erucamide,dibutyl phthalate,methyl palmitoleate,and dimethyl phthalate)were used to replace plasticizers in mulberry gardens by using distilled water as CK to conduct indoor pot experiments,and then the effects of adding exogenous plasticizers with a high level of 0.05 mol/L on the biomass and nitrogen accumulation of mulberry seedlings were analyzed.[Result]Methyl palmitoleate had a significant inhibitory effect on the growth in the above-ground part of mulberry,and the biomass in the above-ground part of mulberry seedlings was only 0.56 g/plant,which was 0.38 g/plant lower than that of CK,and erucamide caused the death of mulberry seedlings;The total nitrogen accumulation in the above-ground part and roots of mulberry treated with the other four plasticizers was 5.08-7.88 mg/plant and 4.65-7.73 mg/plant respectively,the ammonium nitrogen accumulation in the above-ground part and roots was 0.81-32.02 μg/plant and 9.75-20.99 μg/plant,the nitrate nitrogen accumulation in the above-ground part was 54.52-106.89 μg/plant,which was lower than that of CK significantly;The nitrate nitrogen accumulation of roots was 7.38-15.5 μg/plant,which was higher than that of CK significantly.[Conclusion]The five plasticizers has inhibitory effect on the biomass and nitrogen accumulation of mulberry,among which erucamide caused the death of mulberry seedlings directly,while dibutyl phthalate has the strongest inhibitory effect on the nitrate nitrogen accumulation in the above-ground part of mulberry.
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