园林绿化废弃物堆肥对铅、锌污染土壤上小白菜生理特性的影响

为探讨园林绿化废弃物堆肥(GWC)对重金属污染下小白菜(Brassica chinensis L.)生理特性的影响,采用盆栽试验,研究不同GWC施用量(质量分数分别为0、1%、2%、5%)对铅(500 mg·kg^-1)、锌(1 000 mg·kg^-1)单一和复合污染下小白菜生物量、叶绿素含量、丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性和游离脯氨酸含量的影响。结果表明:随着GWC施用量的增加,铅、锌单一和复合污染下小白菜生物量、叶绿素含量、游离脯氨酸含量呈上升趋势,MDA含量有不同程度的下降。施用GWC能提高铅、锌单一和复合污染下小白菜CAT活性。施用适当量的GWC能促进小白菜生长,改善小白菜生理特性,提高小白菜抵御铅、锌胁迫的能力。

Effects of applying green waste compost on physiological characteristics of pakchoi in Pb,Zn contaminated soil

To investigate the effects of green waste compost (GWC) on the physiological characteristics of pakchoi (Brassica chinensis L.) under heavy metal pollution, a greenhouse pot experiment was carried out. Soils of lead (Pb) contamination (500 mg·kg^-1), zinc (Zn) contamination (1 000 mg·kg^-1) and Pb-Zn combined contamination were amended with three levels of GWC (1%, 2%, 5%) to study the effects on the biomass, chlorophyll content, malondialdehyde (MDA) content, superoxide dismutase (SOD) and catalase (CAT) activity, and free proline content in pakchoi. The results showed that the biomass, chlorophyll content and free proline content of pakchoi increased with the increasing application rate of GWC, but MDA content decreased. The GWC application increased the CAT activity of pakchoi under Pb, Zn and Pb-Zn combined contamination. In conclusion, GWC could promote the growth of pakchoi, improve the physiological characteristics of pakchoi and enhance the resistance to the stress of Pb and Zn with appropriate application level.