中文摘要：

通过温室盆栽试验,研究了添加发酵牛粪和造纸干粉对菌根化紫花苜蓿修复多环芳烃（PAHs）污染农田土壤的影响.结果发现,添加0.5%～2.0%发酵牛粪对紫花苜蓿根系丛枝菌根（AM）真菌侵染率无明显影响,但均显著提高了紫花苜蓿的植株生物量（p〈0.05）,其中,添加1.0%和2.0%发酵牛粪处理的土壤PAHs含量较对照略有降低.添加0.05%和0.1%造纸干粉均显著提高了紫花苜蓿的AM真菌侵染率和植株生物量（p〈0.05）,但添加0.2%造纸干粉却对紫花苜蓿的AM真菌侵染率和植株生物量产生了显著的抑制作用（p〈0.05）,仅添加0.05%造纸干粉处理的土壤PAHs含量显著低于对照（p〈0.05）,且3～5环PAHs降解率均得到显著提高（p〈0.05）.此外,土壤中PAHs降解率与AM真菌侵染率之间呈线性回归关系（R^2=0.247,F=6.217,p〈0.05）.以上结果表明,添加适量（0.5%～2%）发酵牛粪可通过直接增加养分供应来促进植物生长,但对PAHs降解影响较小;添加微量（0.05%～0.1%）造纸干粉可通过增进AM真菌侵染来促进植株生长,加速PAHs降解,因而可作为刺激性物质应用于菌根修复.

英文摘要：

A greenhouse pot-experiment was carried out to investigate the effects of fermented cow dung （FD） and dry powdered sludge of papermaking waste （PP） on phytoremediation of PAH-contaminated farmland soils by arbuscular mycorrhizal fungi （AMF） infected alfalfa （Medicago sativa L.）. The addition of 0.5% to 2.0% FD had no significant effect on AMF infection rate,but could promote growth of alfalfa （p〈0.05）. PAH residues in the 1.0% and 2.0% FD treatments were lower than those in the control treatment. The addition of 0.05% and 0.1% PP enhanced AMF infection rate and plant biomass significantly （p〈0.05）,while a negative effect was observed for the 0.2% treatment （p〈0.05）. Significant degradation of PAH residues was observed only from the treatment with 0.05% PP （p〈0.05）,and the degradation rates of PAHs with three,four or five-ring were higher than those of the control （p〈0.05）. A linear regression relation was observed between PAH degradation rate in soil and the AMF infection rate in plant roots （R2=0.247,F=6.217,p〈0.05）. These results indicated that the appropriate amount（0.5%~2%） of FD addition could increase nutrition to promote plant growth,but had little effect on the degradation of PAHs. However,small amounts（0.05%~0.1%） of PP accelerated AMF infection to improve plant growth and the degradation of PAHs,suggesting that it could be used as a stimulant in mycorrhizoremediation of PAH-contaminated soils.