Acta Agrestia Sinica

›› 2007, Vol. 15 ›› Issue (3): 227-231.DOI: 10.11733/j.issn.1007-0435.2007.03.006

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Ecological Adaptability of Alfalfa Varieties Investigated by Pot Experiment with Sandy Soil under Different Moisture Conditions

WANG Long-chang1, XIE Xiao-yu1, HAMAMURA Kunio2   

  1. 1. College of Agronomy and Bio-technology, Southwest University, Chongqing 400715, China;
    2. Arid Land Research Center, Tottori University, Tottori 680-0001, Japan
  • Received:2006-02-18 Revised:2007-03-16 Online:2007-06-15 Published:2007-06-15

苜蓿沙土盆栽试验的水分生态适应性

王龙昌1, 谢小玉1, 滨村邦夫2   

  1. 1. 西南大学农学与生物科技学院, 重庆, 北碚, 400715;
    2. 鸟取大学干燥地研究中心, 日本, 鸟取, 680-0001
  • 作者简介:王龙昌(1964- ),男,教授,博士生导师,主要从事农业资源利用与农业生态方面的科研与教学工作
  • 基金资助:
    日本公益信托五峰生命科学国际基金项目(Goho Life Sciences International Fund);农业部948项目(961013);西南大学引进人才基金(100076)

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Abstract: In order to discover the ecological adaptability of different varieties in sand land areas,the pot experiment was conducted in greenhouse to investigate the water consumption features,plant physiological indexes,biological characters,output and water use efficiency(WUE) of three alfalfa varieties(WL-323,Siriver and Guyuan) under different soil moisture conditions.The results showed that the water consumption features of alfalfa at various growing stages changed along with the differences of moisture conditions and varieties;there was a remarkable negative correlativity between plant moisture stress(PMS) and soil moisture content,but the change of chlorophyll content in leaves among different moisture conditions and varieties was not remarkable;the plant height,branch number per plant,total branch length per plant,leaf number per plant,root number per plant,root depth,root collar diameter and dry weight of root of alfalfa tended to increase,but the ratio of root/canopy tended to decrease,along with the rise of soil moisture.Among the tested varieties,WL-323 was characterized with large root system,well-developed canopy,high forage output and high WUE,so its ecological adaptability to sandy soil was optimal;Siriver was characterized with high dry weight of root and high ratio of root/canopy,so its drought-resistance was relatively strong and its output and WUE was moderate;Guyuan was a variety with the lowest ecological adaptability to sandy soil.The results may be helpful to the rational distribution of alfalfa varieties and soil moisture adjustment on sandy land.

Key words: Alfalfa(Medicago sativa L.), Variety, Moisture, Ecological adaptability, Sandy soil

摘要： 在温室进行沙土盆栽试验,研究WL-323、Siriver和固原苜蓿在不同土壤水分条件下的耗水特征、生理指标、生物学性状、产草量和水分利用效率的变化。结果表明:苜蓿在生育期的耗水特征因水分条件和品种而异;水分胁迫值(PMS)与土壤含水量呈显著负相关;供试苜蓿叶绿素含量与土壤含水量相关不显著;株高、分枝数、分枝总长、叶片数、根数、主根长、根颈粗和干根重等性状均随着土壤水分的增加呈上升趋势,而根冠比则呈下降趋势;WL-323的根系发达、植株发育良好,产草量和水分利用效率高,对沙土的适应性最优;Siriver的干根重和根冠比高,抗旱性能较好,产草量和水分利用效率居中;固原苜蓿对沙土的生态适应性最差;研究结果对沙化土地区苜蓿品种的合理布局与水分调控具有科学指导价值。

关键词: 紫花苜蓿, 品种, 水分, 生态适应性, 沙土

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