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• 研究报告 • 上一篇    下一篇

典型沙生植物烛台虫实根系形态特征对沙丘微生境的响应

韩旭1,2,李雪华1,3*,刘思洋1,2,贾美玉4,苗纯萍1#br#   

  1. (1中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院大学, 北京 100049; 3中国科学院森林生态与管理重点实验室(中国科学院沈阳应用生态研究所), 沈阳 110016; 4北京师范大学生命科学学院, 北京 100875)
  • 出版日期:2017-06-10 发布日期:2017-06-10

Responses of root morphology to sand microhabitats for typical psammophyte Corispermum candelabrum.

HAN Xu1,2, LI Xue-hua1,3*, LIU Si-yang1,2, JIA Mei-yu4, MIAO Chun-ping1#br#   

  1. (1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3 Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 4 College of Life Sciences, Beijing Normal University, Beijing 100875, China).
  • Online:2017-06-10 Published:2017-06-10

摘要: 烛台虫实(Corispermum candelabrum)是一种广泛分布于科尔沁沙地的典型沙生植物,通过研究根系对生境的响应机制有助于理解沙生植物对于环境胁迫的适应性。本实验对生长在沙丘不同微生境(丘间地与沙丘迎风坡相连的过渡带、迎风坡底部、迎风坡中部、坡顶和背风坡)的烛台虫实采用挖掘法分层获取地下根系,进行烛台虫实根系形态特征的比较研究。结果表明:烛台虫实的根系主要集中于0~10 cm层且主要由直径为0~1 mm的根系组成。沿着过渡带到沙丘顶部的方向,烛台虫实地上、地下生物量、根长密度、表面积密度和组织密度均逐渐减少,但背风坡的这几项指标有所增加;比根长、比表面积的变化则呈现相反趋势。根系的各项指标与沙丘不同微生境土壤含水量具有显著相关性。因此,在过渡带风沙干扰较低、水分状况较好的环境,虫实可以通过根系的大范围生长进行养分和水分的吸收;当处于沙丘顶部风蚀沙埋强烈、水分匮乏的环境时,虫实通过较高的资源吸收利用效率获取足够的养分,维持生存。烛台虫实可以通过根系的合理配置适应不同类型的沙地微生境。

Abstract: Corispermum candelabrum, a typical psammophyte, is widely distributed around semiactive sand dunes of Horqin sandy land. Studies on roots in response to sand microhabitats would help us to deeply understand plant’s mechanisms of adaptation to environmental disturbance or stress in sand dunes. In this study, the excavation method was applied to harvest roots in different soil layers and analyze root morphological variation in different microhabitats along sand dunes (transitional zone, bottom of windward slope, middle of windward slope, the top of sand dune, leeward slope). The results showed that most roots occurred in the layer of 0-10 cm and root diameter was usually less than 1 mm. Along transitional zone to the top of sand dune, aboveground biomass, belowground biomass, root length density, root surface area density and tissue density decreased, while increased at leeward slope. Other indexes such as specific root length and specific root surface area displayed an opposite trend. Roots showed a significant correlation with soil moisture in different microhabitats. We concluded that plants growing in transitional zone with adequate water and nutrients usually take advantages in larger root systems. On the other hand, when growing in the top of sand dune with strong wind erosion and sand burial and water deficit, they usually showed strong efficiency of resource absorption. That means this species has developed reasonable roots allocation for sandy microhabitats.