水生态学杂志2018，Vol.39Issue(5)：104-110,7.DOI:10.15928/j.1674-3075.2018.05.015
刺苦草对铜胁迫的耐受性及其恢复能力研究
Tolerance and Recovery Capability of Vallisneria spinulosa Exposed to Copper
摘要
Abstract
The use of submerged macrophytes in ecological restoration of water polluted by low levels of copper is economic, safe and effective.In this study, Vallisneria spinulosa, a submerged macrophyte widely distributed in Poyang Lake, was selected for study.The tolerance of V.spinulosa to low levels of Cu2+and the ability of V.spinulosato recover from Cu2+exposure were investigated in a laboratory study, aiming to evaluate the potential of using submerged macrophytes for restoring polluted waters.V.spinulosa was planted in aquaria and exposed to copper for one week at four concentrations:a control group CK (0.007±0.012) mg/L and three treatment groups;T1 (0.400±0.026) mg/L, T2 (0.830±0.010) mg/L and T3 (1.697±0.055) mg/L.The copper containing water was then exchanged for tap water and the plants were monitored for an additional two weeks to investigate recovery ability.After the experiment, the wet weight, length, Cu2+content of V.spinulosa roots and shoots, chlorophyll content of leaves and Cu2+concentration of water were determined.Copper significantly inhibited V.spinulosa growth.The length, wet weight and chlorophyll content of V.spinulosain all copper treatments were significant lower than the control.In the treatment groups, the average removal rate of copper by V.spinulosa was 63％ on day 4, significantly higher than the control.The copper content of V.spinulosashoots increased with copper concentration in the water.After exposure for one week, the copper content in T3 was (3.68±0.32) mg/g, 6.4 times higher than in T1.However, the copper concentration in roots did not vary among treatments.The stoichiometric homeostasis index (1/H) of V.spinulosa for copper was 1.09, indicating weak stoichiometric homeostasis for copper.During recovery, the copper content in groups T1, T2 and T3 decreased, respectively, by 43.04％, 92.12％ and 86.00％in shoots and 57.91％, 42.70％ and 33.81％in roots.Wet weight, chlorophyll content and copper content of roots did not differ among treatments.This study indicates that V.spinulosais a copper hyperaccumulator with strong capacity for recovery after exposure to copper.However, to support restoration efficiency, V.spinulosa should be harvested promptly and replanted during restoration of copper polluted water.关键词
刺苦草/重金属/耐受性/恢复能力/铜Key words
Vallisneria spinulosa/heavy metal/tolerance/recovery/copper分类
生物科学引用本文复制引用
陈璐,李威,王敏,高桂青,周际海,樊后保,钟家有..刺苦草对铜胁迫的耐受性及其恢复能力研究[J].水生态学杂志,2018,39(5):104-110,7.基金项目
江西省水工程安全与资源高效利用工程研究中心开放基金(OF201611) （OF201611）
水利部鄱阳湖水资源水生态环境研究中心开放基金(ZXKT201511) （ZXKT201511）
江西省科技计划项目(20161BBG70048) （20161BBG70048）
江西省"十二五"水土保持与荒漠化防治重点学科培育基金. （）
