摘要
沉水植物的恢复是水生态修复的关键,但在光照、溶解氧以及水力条件等满足的情况下,不同性质的底质会影响沉水植物的生长。以菹草(Potrmogeton crispus)为研究对象,通过向过适宜营养条件下的底泥中添加原底泥30%、70%、100%体积量的沙,以改变底质的物理性质,在30 d内测定菹草的过氧化物酶(POD)、过氧化氢酶(CAT)、植物叶绿素、植物干物率、植物根系活力的变化情况。结果表明,几种处理试验组中,掺加原底泥体积70%沙组的CAT活性响应得较慢,在第20天时才达最大;全底泥和掺加原底泥体积30%沙的2个试验组10 d后POD活性持续上升,而掺加原底泥体积70%和100%组对POD的响应则几乎停止;各试验组植物叶绿素整体呈现下降趋势,但掺加原底泥体积100%沙组中植物叶绿素最高。植物干物率在20 d后都呈现下降的趋势。研究表明,若只通过加沙改变河道底质性质,则加原底泥体积70%～100%的沙对菹草的生长相对最有利。
The recovery of the submerged plants is the ecological restoration of water key,but in the water light,dissolved oxygen and hydraulic conditions satisfied situation,different physical properties of the sediment will affect the growth of submerged plants.This research through to the supersaturation of nutritional conditions in sediment,add to the original 30%,70%,100% volume of sand,in order to change the physical properties of sediment,in the 30 d determination of plant peroxidase（POD）,catalase（CAT）,chlorophyll,plant dry matter rate,plant root dynamic changes.The results show that,several processing 70% sand group CAT activity in response to slowly,in the 20 d than maximal.The activity of POD 10 d after whole sediment group and 30% sand group continued to rise,the 70% and 100% groups in response is almost stopped.Plant chlorophyll whole presents a downward trend,but the 100% sand group plant chlorophyll is the highest.Dry matter rate after 20 d showed a downward trend.This study shows that,if only through Gaza to change the river sediment characters,plus the original sediment volume 70%-100% sand on plant growth relative to the most favorable.
出处
《生态环境学报》
CSCD
北大核心
2012年第7期1311-1314,共4页
Ecology and Environmental Sciences
基金
国家水体污染控制与治理科技重大专项课题(2008ZX07421-001)
关键词
沉水植物
菹草
底质物理性质
植物生理
submerged plant
potamogeton crispus
sediment physical properties
plant physiology
