水污染对菹草及伊乐藻生长的影响

针对沉水植物在污染水体中的生存阈值问题,在满足光补偿点的条件下,研究不同劣Ⅴ类水质中菹草(Potamageton crispus)、伊乐藻(Elodea nattalii)的生长情况。结果表明:①如果能够保证水体光补偿点条件,在苏州市3种劣Ⅴ类水质中,菹草、伊乐藻均能保证基本存活,且无论从表观上还是从体内的保护酶来看,伊乐藻对污染的适应能力均优于菹草。②在实验过程中,菹草及伊乐藻的叶绿素含量基本上呈下降趋势,说明在污染环境中植物生长状况不良。③菹草及伊乐藻在水质相对较好的苗家河水样中的生长情况优于水质相对较差的薛家河及竹辉河。

Experimental research on growth of Potamageton crispus and Elodea nuttallii under different polluted water

The growth of Potamageton crispus and Elodea nuttallii in three different water bodies with water quality inferior to class Ⅴ was carried out in the lab.Results show that:(1)both Potamageton crispus and Elodea nuttallii can grow in the three different water bodies if the light compensation point can be satisfied,and the adaptability of the latter is better than the former,no matter from the apparent or the protective enzyme systems;(2)during the experiment,the chlorophyll of both shows a tendency of declining,which means that the macrophytes can not grow well in the polluted water;(3)both Potamageton crispus and Elodea nuttallii grow much better in the water of Miaojia River than in the water of Xuejia River and Zhuhui River.