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草业学报  2015 

天然盐碱土壤对虎尾草茎叶有机酸积累影响及胁迫因子分析

DOI: 10.11686/cyxb20150411, PP. 95-103

Keywords: 虎尾草,天然盐碱化土壤,土壤电导率,有机酸积累,多元回归

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Abstract:

虎尾草是一种耐盐碱性很强的天然牧草,在吉林省长岭县盐碱化草地上随机选择45个虎尾草天然种群样点,测量每个样点的土壤电导率、pH、缓冲量3个因素作为反映土壤盐碱化程度的胁迫强度指标,在每个样点上测量虎尾草茎叶中有机酸含量作为反映植物生理响应的胁变指标,进行回归分析。结果表明:虎尾草茎叶大量积累柠檬酸、苹果酸、草酸以及总有机酸以响应强盐碱胁迫且与三胁迫因素呈显著正相关,仅积累量较低的琥珀酸相反。多元回归分析发现土壤电导率对除了琥珀酸之外的其他有机酸积累影响最大,电导率可以作为天然盐碱化土壤环境下考察虎尾草响应盐碱胁迫的主要胁迫因素。

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