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OALib Journal期刊
ISSN: 2333-9721
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翅碱篷根系分泌有机碳和无机碳对zn(ii)胁迫的响应
DOI: 10.3724/SP.J.1145.2014.00134, PP. 134-138
Keywords: zn胁迫,总有机碳,无机碳,翅碱蓬,根系分泌物
Abstract:
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，zn(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-1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（ρzn(ii)≤20mgl-1），采用线性方程描述较高浓度zn(ii)胁迫的增加趋势（ρzn(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.
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