| 摘要: |
| 【目的】探究羊柴（Hedysarum laeve）对盐碱胁迫的适应性，为羊柴在盐碱区域日益增多的毛乌素沙地中的栽植提供理论依据。【方法】采用盆栽试验，通过模拟毛乌素沙地实际盐碱状况，以清水为对照，设置轻度、中度和重度盐碱胁迫处理，分别于羊柴生长旺盛期和生长结束期对其根系总长度、平均直径、表面积、体积、根尖数、分叉数等指标进行测定，以了解羊柴根系在盐碱胁迫条件下的生长特性。【结果】在羊柴生长旺盛期和生长结束期，盐碱胁迫对羊柴根系直径均表现出明显的正效应。在羊柴生长旺盛期，盐碱胁迫对羊柴根系总长度、表面积、体积、分叉数有一定抑制作用，随盐碱胁迫程度增大，羊柴根尖数呈先升高后降低的趋势；在羊柴生长结束期，随盐碱胁迫程度升高，羊柴根系总长度、表面积、体积、分叉数均呈先缓慢增加后迅速下降的趋势，而根尖数则呈降低趋势。【结论】生长旺盛期羊柴对盐碱的抵御能力较弱，盐碱会抑制其根系的生长；生长结束期时，轻度盐碱对羊柴根系的生长有一定促进作用，中度以上盐碱胁迫对根系生长有明显抑制作用。 |
| 关键词: 羊柴 毛乌素沙地 盐碱胁迫 根系特性 |
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| 基金项目:国家林业局948项目“人工调控荒漠灌丛生态空间构型技术引进”（20150422） |
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| Adaptation evaluation of saline-alkali condition on roots of Hedysarum laeve in Mu Us sandy land |
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CHEN Xiaona,GAO Yong,ZHAO Naqi,et al
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| Abstract: |
| 【Objective】In order to explore Hedysarum laeve to adapt to the characteristics of saline alkali stress and provide a theoretical basis for the cultivation practices of Mu Us sandy land.【Method】We took the annual Hedysarum laeve seedlings as test materials,then measured total root length,root diameter,root surface area,root volume,root tip number,root branch number to realize the roots growth characteristics of Hedysarum laeve under saline-alkali stress.【Result】The results showed that saline-alkali stress had a positive effect on the average root diameter in two kinds of growth period.In the vigorous growth period,total root length,root surface area,root volume,root branch number gradually decreased with the increase of saline-alkali concentration,but tips increased first and then decreased with the increase of saline-alkali concentration;in the end of growth period,total root length,root surface area,root volume,root branch number increased first and then decreased with the increase of saline alkali concentration,but tips showed a decreasing trend.【Conclusion】This suggested that Hedysarum laeve had a low abilities to resist saline-alkali stress in the vigorous growth period;mild stress had a promoted effect to roots in the end of growth period,but the growth of roots was inhibited in moderate stress and severe stress. |
| Key words: Hedysarum laeve Mu Us sandy land saline-alkali stress root characteristics |
