欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

伊犁河谷苦豆子植冠种子库特征

刘影1,2,赵玉1,2*,穆尼热3,李文慧3#br#   

  1. 1伊犁师范学院生物与地理科学学院, 新疆伊宁 835000; 2新疆自治区普通高校天然产物化学与应用重点实验室, 新疆伊宁 835000; 3伊犁师范学院化学与环境科学学院, 新疆伊宁 835000)
  • 出版日期:2017-04-10 发布日期:2017-04-10

Canopy seed bank of Sophora alopecuroides L. in Ili River Valley.

LIU Ying1,2, ZHAO Yu1,2, MUNIR3, LI Wen-hui3#br#   

  1. (1Biology and Geography School, Yili Normal University, Yining 835000, Xinjiang, China; 2University  Key Lab of Natural Product Chemistry and Application in Xinjang Yili Normal University, Yining 835000, Xinjiang, China; 3Chemistry and Environment Science School, Yili Normal University, Yining 835000, Xinjiang, China).
  • Online:2017-04-10 Published:2017-04-10

摘要: 植物果实成熟后在植冠宿存延迟释放种子,是沙生生境植物的一种适应性性状。以分布于新疆霍城县荒漠草原内的野生苦豆子(Sophora alopecuroides L.)为研究对象,采用野外调查的方法,调查了野生苦豆子的植冠种子库的大小、种子活力、对土壤种子库的补充及其脱落动态。结果表明:在3月上旬,苦豆子植冠宿存种子的规模为271±124粒·m-2;其中,完整种子达144±138粒·m-2,构成了苦豆子的植冠种子库;对种皮进行机械破损后,植冠种子库的种子发芽率达76.98%±11.89%,种子活力指数保持在72.44±39.01;苦豆子生殖株植冠种子库种子宿存的时间长达9个月,可以在较长时间范围内有效补充土壤种子库,并与土壤种子库共同执行种群更新和群落演替的繁殖体供应库的功能。研究结果有助于了解苦豆子的繁殖生态学特性,解析其在伊犁河谷恶性蔓延的生物生态学机理,为伊犁河谷草原生态系统的科学管理提供理论支持。

关键词: 吸收, 梨, 砧木, 15N-尿素, 磷, 利用

Abstract:

Canopy seed banks and delayed release adaptations are particularly prominent in sandy ecosystems. In this study, we investigated the size, seed vigor, supplementary effect on soil seed bank, and the retention dynamics of Sophora alopecuroide canopy seed bank in a desert grassland of Huocheng County, Xinjiang. The result showed that canopy had 271±124 beans·m-2, and the number of complete seeds reached 144±138 beans·m-2 which contributed to the canopy seed bank. After mechanical damage, the germination rate reached 76.98%±11.89%, seed vigor index was 72.44±39.01, which indicated that canopy seed bank could keep higher seed vigor. Canopy seed bank lasted about nine months. As a result, canopy seed bank could be an effective supplement to the soil seed bank, and both of them performed as effective supply bank of propagules during population regeneration and community succession. The results would be helpful to understand the reproductive characteristics, reveal the bioecological mechanism of its malignant invasion, and provide theoretical support for management of grassland ecosystem in the Ili River Valley.
 

Key words: phosphorus, absorption, 15N-urea, utilization, pear, rootstock