中文摘要：

滨海盐生植物是潮滩湿地生长的重要先锋植物和土壤（沉积物）污染修复物种．为了解翅碱蓬（Suaedaheteroptera）根系分泌对重金属Zn（II）胁迫的响应，以室内沙培盆栽试验方式研究了不同浓度Zn（II）胁迫32d翅碱蓬根系释放分泌物中总有机碳（TOC）和无机碳（IC）含量的变化．结果表明，Zq（II）胁迫24d内，可采用指数方程描述翅碱蓬根系分泌物中IC含量随Zn（II）胁迫浓度增加呈降低的趋势．除最高Zn（II）胁迫浓度200mgL。外，翅碱蓬根系分泌物中Ic含量随胁迫时间延长而增加．并可采用形如米氏方程的数学方程描述较低浓度Zn（II）胁迫的增加趋势（PznoI）≤20mgL-1），采用线性方程描述较高浓度Zn（II）胁迫的增加趋势（PZn（II）=40-100mgL-1）．短时间Zn（II）胁迫时，翅碱蓬根系分泌物中TOC含量随胁迫浓度增加而增加，但较长胁迫时间（〉16d）则随胁迫浓度增加而降低．10mgL-1以上Zn（II）胁迫时，翅碱蓬根系分泌物中TOC含量降低．本研究表明Zn（II）胁迫导致了翅碱蓬根系呼吸作用和有机分泌作用发生改变．图2表4参36

英文摘要：

The littoral halophytes are pioneer species that grow in the coastal marshes. They are important plant species for phytoremediation and forming wetland landscape in the coastal zone. To ascertain the secretion of root exudates from littoral halophyte seepweed （Suaeda heteroptera） in response to zinc ion stress, we conducted a pot sandponic test, measured the concentrations of the inorganic carbon （IC） and the total organic carbon （TOC） in the root exudates secreted from seepweed under Zn（II） stress treatment for 32 days. The IC concentrations in the root exudates decreased with the increasing of Zn（II） concentration during a 24-day period under Zn（II） stress treatments. The relationship could be described by an exponential equation. The IC concentrations increased with exposure time except under highest concentration of 200 mg L-1 The relationship could be described by the Michaelis-Menten equation and the linear equation for lower Zn（II） stress treatments （pzn（II）〈 20 mg L-1） and higher Zn（II） stress treatments （Pzn（II） = 40-100 mg L-1）, respectively. The TOC concentration increased with the increasing of Zn（II） concentration during shorter exposure period （〈 16 days）, but decreased after exposure time of 16 days. The TOC concentration declined with Zn（II）-exposed concentrations higher than 10 mg L-1 of Zn（II）. The secretion of inorganic carbon in the roots of seepweed induced by Zn（II） stress increased with increasing exposure time and decreased with exposure concentration. As a conclusion, we think that the seepweed are induced by Zn（II） stress. changes of respiration and secretion of organic carbon in the roots of