改性生物质炭对原油污染土壤中苏丹草萌发的影响.

To explore the effects of modified biochar on seed germination and seedling growth of sudangrass under crude oil stress, cotton straw biochar modified by nitric acid and Fenton reagent was added to the contaminated soil with 4% oil content. The effects of the two kinds of modified biochar on germination rate, germ length, radicle length, biomass, and total petroleum hydrocarbon degradation rate of sudangrass were studied by soil culture germination test. The results showed that both biochar and modified biochar significantly increased soil organic matter content（P<0.05）. The addition of unmodified biochar increased soil pH, while the addition of biochar modified by nitric acid and Fenton reagent decreased soil pH. Compared with the treatment without biochar, the addition of biochar significantly increased the germination rate, germ length, and plant biomass accumulation of sudangrass. Modified biochar promoted seed growth. The germ length and biomass in treatments with 4% biochar modified with nitric acid increased by 67.83% and 80.26%, respectively, compared with the control group. The addition of biochar and modified biochar could significantly improve the degradation rate of total petroleum hydrocarbons in soil. Compared with the treatment without biochar, the degradation rate of total petroleum hydrocarbons in treatments with 4% biochar and 4% Fenton-modified biochar increased by 23.86 and 20.89 percentage points, respectively. Therefore, under crude oil stress, the addition of modified biochar mitigates the negative effects of crude oil pollution on seed germination of sudangrass. The modification method and the amount of added biochar will affect the short-term degradation effect of petroleum hydrocarbons in soil under the joint action of sudangrass and biochar. [ABSTRACT FROM AUTHOR]