盐度对木榄幼苗某些金属元素累积的影响及钙的效应

应用生态学报 ›› 2000, Vol. ›› Issue (2): 177-180.

盐度对木榄幼苗某些金属元素累积的影响及钙的效应

李银鹏, 林鹏

厦门大学生物系, 厦门361005

收稿日期:1998-03-17 修回日期:1998-06-10 出版日期:2000-03-25
通讯作者: 李银鹏,男,31岁,理学博士,副研究员,现在中国科学院大气物理研究所工作,研究方向为植物适应生理生态学,大气、植物和土壤相互作用的理论和数值模拟.发表论文多篇.E-mail:LYP@ast590.tea.ac.cn
基金资助:
国家教委博士点基金资助项目(9538402)

Impact of salinity on accumulation of several metal elements in Bruguiera gymnorrhiza seedlings and Ca effect

LI Yinpeng, LIN Peng

Xiamen University, Xiamen 361005

Received:1998-03-17 Revised:1998-06-10 Online:2000-03-25

摘要/Abstract

摘要： 通过对 40 0mmol·L^-1NaCl及不同浓度CaCl² 溶液处理的沙基培养的红树植物木榄幼苗各器官的K、Ca、Na、Mg含量的测定分析,结果表明,木榄幼苗在 40 0mmol·L^-1NaCl培养时各器官中积累大量的Na,造成K/Na和Ca/Na比值降低,幼苗干物质积累下降.补充Ca能减少Na在幼苗体内的累积,提高K/Na和Ca/Na,增加干物质积累,从而缓解盐胁迫,10～15mmol·L^-1CaCl² 为适宜浓度.本文的结论是在高盐度培养时木榄幼苗能够吸收大量的无机离子,增强渗透调节能力,保持对K/Na的高选择吸收性.这些特性是木榄对河口、海岸高盐度生境适应的主要生理机制,而生境土壤中适宜的Ca/Na也是其能够生存繁衍的重要原因之一.

Abstract: The contents of K,Ca,Na and Mg in different organs of Bruguiera gymnorrhiza seedlings cultured in sand bases with solutions of 400 mmol·L^-1 NaCl and different concentrations of CaCl₂ were determined.In the treatment of 400 mmol·L^-1 NaCl,Na was largely accumulated in organs,which caused the decrease of K/Na and Ca/Na,and decreased dry matter accumulation in seedlings.Supplemental CaCl₂ decreased the accumulation of Na in seedlings,increased the ratios of K/Na and Ca/Na and the accumulation of dry matter,and thereby,mitigated salt stress.The suitable concentration of CaCl₂ was 10～15 mmol·L^-1.It was concluded that B.gymnorrhiza seedlings cultured at high salinity accumulated more metal ions,which enhanced osmotic adjustment of plants,and kept highly selective absorption of K/Na.These characteristics are the main physiological mechanisms of the adaptation of B.gymnorrhiza to high salinity in estuary and coast,while suitable Ca/Na in soil is one of the important causes that B.gymnorrhiza can survive and regenerate in high salinity coast.

李银鹏, 林鹏. 盐度对木榄幼苗某些金属元素累积的影响及钙的效应[J]. 应用生态学报, 2000, (2): 177-180.

LI Yinpeng, LIN Peng. Impact of salinity on accumulation of several metal elements in Bruguiera gymnorrhiza seedlings and Ca effect[J]. Chinese Journal of Applied Ecology, 2000, (2): 177-180.

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