两种植物条件下土壤中矿物油和多环芳烃（PAHs）的生物修复研究

选择苜蓿草和水稻为供试植物，以污染物水平、有机以、专性细菌和真菌为调控因子，进行土壤中矿物油和PAHs的生物修复研究，结果表明，投肥对苜蓿草土壤中矿物油降解有促进作用，但对水稻土壤中矿物油降解无明显作用，投肥均使苜蓿草和水稻土壤中多环芒烃总量（11种列于美国EPA黑名单上的多环芳烃）降解率提高，这一降解促进效果在水稻土壤中好于苜蓿草土壤，有机肥量与苜蓿草根际土著真菌、细菌数量明显呈正相关，但仅与水稻根际土著细菌数量呈明显正相关，两种土壤中实测真菌和细菌总数均与试验投加专性真菌和细菌量无关，水稻土和苜蓿草土壤中3环多环芳烃的降解随投肥量增大而降解率提高，其在水稻土蓑中的效果好于苜蓿草土壤，投肥怪4环多环芳烃的降解并未产生有效作用。

Bioremediation of mineral oil and polycyclic aromatic hydrocarbons (PAHs) in soils with two plant species

With alfalfa( Medicago sativa ) and paddy rice as test plants,and with pollutant level,specific bacteria,fungi and orga nic fertilizer as control factors,the bioremediation of mineral oil and polycyclic aromatic hydrocarbons (PAHs) in soils with two plant species was conducted.The results showed that the degradation rate of mineral oil was promoted by fertilization in alfalfa soil,but not in paddy rice soil.The degradation rate of total PAHs (11 PAH listed in USEPA) was increased by fertilization both in alfalfa and in paddy rice soil,and the promotion effect of fertilizer was better in paddy rice soil than in alfalfa soil.The fertilization rate was positively related to the rhizospheric indigenous fungi and bacteria's CFU in affalfa soil,but only to the indigenous bacteria's CFU in paddy rice soil.The fungi and bacteria's CFU in both test soils had no positive relation with the amount of specific bacteria and fungi spiked.The degradation rate of 3 ring PAHs was inhanced in both alfalfa and paddy rice soil by fertilization,and the effect was stronger in paddy rice soil than in alfalfa soil.However,fertilization had no positive effect on the degradation of 4 ring PAHs.