重金属铬(Ⅲ)对红树植物白骨壤幼苗生长的影响  

Effects of chromium(Ⅲ) on the seedling growth of mangrove species Avicennia marina

作　　者：方煜[1] 郑文教[1] 万永吉[1] 陈昌徐[1] 盛华夏[1] 

机构地区：[1]厦门大学生命科学学院,福建厦门361005

出　　处：《生态学杂志》2008年第3期429-433,共5页Chinese Journal of Ecology

基　　金：福建省自然科学基金计划资助项目(D0710025)

摘　　要：采用砂基栽培,研究重金属铬(III)不同胁迫强度(0、100、200、300、400、500、600、800mg.L-1)和胁迫时间(25、45和150d)条件下,对红树植物白骨壤(Avicenniamarina)成熟胚轴萌发及幼苗生长的影响。结果表明:Cr(III)胁迫(0～800mg.L-1)对白骨壤成熟胚轴的初期萌发无明显的影响。胁迫栽培45d时,随着Cr(III)浓度的提高,白骨壤幼苗苗高生长、根系生长及各组分生物量和总生物量均表现出逐渐下降的趋势,但下降幅度不大。当胁迫时间延长至150d时,Cr(III)浓度在100mg.L-1时对幼苗的生长影响不明显,而浓度在100mg.L-1以上,达到200mg.L-1以上水平,则对幼苗根系生长、苗高、叶片大小及生物量生长均具有明显抑制的作用,并将随胁迫时间的增加而加剧。By the method of sand culture, this paper studied the effects of different concentration chromium（Ⅲ）（0,100,200,300,400,500,600,800 mg·L^-1） on the matured hypocotyl germination and seedling growth of Avicennia marina on 25, 45 and 150 days of treatment. The results showed that the germination of matured hypocotyl was not obviously affected by Cr（ Ⅲ ） during the early germination period. When the stress reached 45 days, the growth of stem height, root, and component and total biomass was decreased with increasing Cr（ Ⅲ ） concentration, but the decrement was not remarkable. With the stress prolonging to 150 days, low Cr（Ⅲ ） concentration （ 100mg·L^-1 ） didn＇t have obvious negative effects on the seedling growth, but 〉 100mg·L^-1, especially 〉200mg·L^-1of Cr（Ⅲ） inhibited the growth of root, stem length, leaf size, and biomass distinctly, and the effects would be more severe with extending stress time.

关 键 词：红树植物 白骨壤 铬(Ⅲ) 幼苗生长 

分 类 号：X173[环境科学与工程—环境科学]