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灰叶胡杨横走侧根空间分布与克隆繁殖的关系

郑亚琼1,2,周正立1,2,李志军1,2**   

  1. (1新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室, 新疆阿拉尔 843300; 2塔里木大学植物科学学院, 新疆阿拉尔 843300)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Spatial distribution of horizontal lateral roots of Populus pruinosa Schrenk in relation to clonal reproduction.

ZHENG Ya-qiong1,2, ZHOU Zheng-li1,2, LI Zhi-jun1,2**   

  1. (1Key Laboratory of Biological Resource Protection and Utilization of Tarim Basin, Xinjiang Production and Construction Group, Alar 843300, Xinjiang, China;
    2College of Plant Sciences, Tarim University, Alar 843300, Xinjiang, China)
  • Online:2013-10-10 Published:2013-10-10

摘要:

对在中国仅分布于新疆塔里木盆地的灰叶胡杨成株、幼株和1年生实生苗开展多点实地调查和室内分析,研究了灰叶胡杨克隆繁殖器官的空间分布特征及其与克隆繁殖的关系。结果表明,灰叶胡杨克隆繁殖器官均为主根上的一级横走侧根,其空间分布特征为:1)与主根排列成近90°角,在土壤中进行水平方向营养生长和扩展,生长到一定阶段在特定的空间位点垂直下扎;2)同一主根上不同的一级横走侧根,其水平扩展部分在距地表10~100 cm的土层中分布,且集中在20~40 cm;不同的横走侧根在土壤中的分布深度、扩展方向和扩展距离都有所不同,同一条横走侧根的不同区段在土壤中的分布深度、扩展方向和扩展距离也不相同;3)不同生境条件下,灰叶胡杨能够产生克隆分株的横走侧根垂直空间分布几近一致,主要分布在距地面5~30 cm土层内,地下水位影响横走侧根上克隆繁殖的发生。
 

Abstract: Populus pruinosa only naturally distributes in the Tarim basin of Xinjiang, Northwest China. In this paper, field investigation and laboratory analysis were conducted on the adults, samplings, and 1-year old seedlings of P. pruinosa, aimed to understand the spatial distribution of the clonal reproduction organs of P. pruinosa and the relationships of this distribution with clonal reproduction. The clonal reproduction organs of P. pruinosa were all the first order horizontal lateral roots on the taproots. The clonal reproduction organs and taproots formed in nearly 90 degree angle, and carried on vegetative growth and horizontal expansion in soil until they grew to a certain stage and penetrated vertically at particular space sites. The same taproots had different first order horizontal lateral roots, whose horizontal expansion parts were in the 10-100 cm soil layer and concentrated in the 20-40 cm layer. Different horizontal lateral roots had different distribution depth, extending direction, and expansion distance in soil, and even, different sections of the same horizontal lateral roots also had different distribution depth, extending direction, and expansion distance in soil. In different habitats, P. pruinosa could generate the horizontal lateral roots with almost unanimous vertical distribution. The generated horizontal lateral roots could produce clonal ramet, and were mainly distributed in the 5-30 cm soil layer. Underground water level could affect the occurrence of the clonal reproduction of horizontal lateral roots.