平原河网水中悬浮颗粒物对金鱼藻、水网藻的影响

研究了水体悬浮颗粒物对修复植物的影响规律,结果揭示了悬浮颗粒物对水生植物影响的两面性以及修复植物对颗粒物胁迫产生自由基进行清除的适应机制。在正常情况下,金鱼藻(Ceratophyllum dem ersumL)体超氧化物歧化酶活性维持在256~280 U/g(鲜重),过氧化物酶活性维持在80~90 U/g(鲜重)的水平,保证了细胞膜脂质氧化的分子标志物MDA的代谢水平低于65μmol/g(鲜重)。当金鱼藻受到大于300 mg/L颗粒物的高强度胁迫时,其体内这两种抗氧化酶活性不仅没有维持在很高的水平,反而均呈下降趋势,致使金鱼藻体内的MDA平均值可达79μmol/g(鲜重)以上,形成了对细胞膜相对损伤率达35%以上的氧化损伤结果。在高浊度水体中水网藻(Hydrodictyon reticulatum)内比金鱼藻具有更强的适应性,因此水网藻更合适作为先锋修复植物。

Influence of Suspended Particulate Matter on Ceratophyllum demersum L & Hydrodictyon reticulatum in Plain River

The influence of suspended particulate matter on phytoremediating plants was investigated.The results indicated that the suspended particulate matter had both positive and negative effects and the elimination mechanism on the free radicle which were produced by the stress of particulate matter within restoration organisms.Under normal condition,the activity of SOD and POD of hornwort maintains 256~280 U/g(green weight)and 80~90 U/g(green weight),thus the activity of MDA,which is the cellular membrane lipid oxydic marker was under 65 μmol/g(green weight).When hornwort was under the high stress of particulate matter more than 300 mg/L,the activity of both antioxidase declined rather than maintained high level,which caused the average level of MDA reached 79 μmol/g and higher(green weight).It leaded to more than 35% cell membrane injury.Due to the higher adaptability of Hydrodictyon reticulatum than Ceratophyllum demersum L in high turbid water,it was indicated that Hydrodictyon.reticulatum is more suitable to be a pioneer phytoremediating plants.