Effect of suspended matter in the polluted water on the growth of Potamageton crispus

Abstract

以菹草(Potamageton crispus)为对象,通过对植物鲜重、叶绿素含量、净产氧量、过氧化物酶(POD)和过氧化氢酶 (CAT)活性的观测,研究了悬浮物附着对沉水植物生理生化作用的影响．结果表明,在苏州苗家河重污染水体中,高负荷的悬浮物对菹草的生长产生重大影响．实验25 d,有悬浮物附着的菹草的生物量仅为对照样的63．93%,叶绿素含量及叶绿素a/b值仅为对照样的66．24%和63．88%;植物体内的过氧化物酶活性及过氧化氢酶活性也呈现下降趋势,分别为对照样的61．25%和40．30%．悬浮物是重建沉水植物的重要限制因素之一．;In order to analyze the effect of the attachment of suspended matter on the physiological and biochemical characteristics of macrophyte, several indices were tested: fresh weight (FW), chlorophyll content, net primary production, peroxides(POD) activity and catalaes(CAT) activity. Results showed that high loading suspended matter in Miaojia River in Suzhou had significant effect on the growth of Potamageton crispus. After the experiment was finished, its biomass, chlorophyll content, and ratio of chlorophyll a/b of Potamageton crispus being attached with suspended matter were only 63.93%, 66.24% and 63.88% of the reference one respectively. Activities of POD and CAT of Potamageton crispus decreased, which were 61. 25% and 40. 30% of the reference one. Suspended matter was one of the important factors controlling the reconstruction of submerged macrophyte.