关键词: 黄土丘陵, 半干旱地区, 人工沙棘林, 水土保持, 土壤水分

Abstract: A hydroponic experiment was conducted to study the impacts of zinc (Zn), benzo\[a\]pyrene (B\[a\]P), and their combination on the growth and antioxidant enzymes activities of Triticum aestivum seedlings. As compared with CK, the biomass and plant height of the seedlings under the stresses of Zn, B\[a\]P, and their combination decreased. Under the combined stress of 300 mg·L^-1 of Zn and 54 mg·L^-1 of B\[a\]P, the above and underground dry mass decreased by 36.4% and 51.7%, respectively, and the decrements were obviously larger than those under single stress. In all treatments with Zn and/or B\[a\]P, the superoxide dismutase (SOD) activity presented a trend of increasedecreaseincrease and was lower than that in CK, whereas the peroxidase (POD) and catalase (CAT) activities decreased after an initial increase. Under combined stress, the POD activity was the highest, while the CAT activity was the lowest. Under the single and the combined stress, the seedling’s growth was inhibited, being most obvious under combined stress. The joint action of Zn and B\[a\]P was of synergistic effect.