干旱区研究

干旱区研究 ›› 2011, Vol. 28 ›› Issue (6): 1038-1044.

• 植物生态 • 上一篇    下一篇

腾格里沙漠南缘3种优势植物种子出苗对土壤类型和沙埋的响应

 樊宝丽1, 马全林1, 张德魁1, 安婧荣2·   

    1. 甘肃省荒漠化防治重点实验室 甘肃省治沙研究所，甘肃 兰州 730070
    2. 古浪县林业局，甘肃 古浪 733100
  • 收稿日期:2010-10-12 修回日期:2010-11-06 出版日期:2011-11-15 发布日期:2012-01-16
  • 作者简介:樊宝丽（1982-），女，甘肃白银人，研究实习员，硕士,主要从事植物生态学和恢复生态学方面的研究.E-mail: baoli207@163.com
  • 基金资助:

    国家自然科学基金项目（41061030）；“973”计划前期项目（2011CB411912）；省青年科技基金计划（1107RJYA011）

Response of Seedling Emergence of Three Dominant Plant Species to Soil Type and Sand Burial Depth in the Southern Marginal Zone of the Tengger Desert

 FAN  Bao-Li1, MA  Quan-Lin1, ZHANG  De-Kui1, AN  Jing-Rong2   

    1. Gansu Province Key Laboratory of Desertification Combating & Gansu Province Institute of Desert Control Research, Wuwei 733000, Gansu Province, China
    2. Gulang County Forestry Bureau, Gulang 733100, Gansu Province, China
  • Received:2010-10-12 Revised:2010-11-06 Published:2011-11-15 Online:2012-01-16

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被引次数

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摘要： 沙米（Agriophyllum squarrosum）、沙蒿（Artemisia sphaerocephala）和油蒿（Artemisia ordosica）分别是腾格里沙漠南缘不同植被演替阶段的3个优势物种，2009年5～6月在大田盆栽条件下，设计了2种土壤类型和 0 cm，1 cm，2 cm，3 cm，4 cm，6 cm，8 cm 共7个沙埋深度处理，研究土壤类型和沙埋对这3种植物种子出苗的影响。结果发现：在沙土条件下，沙米0 cm埋深出苗率最低、出苗速度最慢；1～2 cm的浅层埋深下，沙米、沙蒿和油蒿的幼苗出苗速度最快、出苗率也最高。出苗时间随着沙埋深度的增加而延长，出苗率随着沙埋深度的增加而降低。沙壤土条件下，3个物种的出苗率及出苗速度都较沙土条件中的同等埋深条件下有所降低，同时，沙米和油蒿的最佳埋深由 2 cm降低到 1 cm，表明沙土比沙壤土更利于植物的出苗。沙土条件下，沙米在 0～6 cm 各个埋深处理下都有较高的出苗率，生态适应性较沙蒿和油蒿更广，所以能够成为流动沙丘的优势物种；沙壤土条件下，沙米在各个埋深处理下开始出苗所需时间均最长，同时，沙米的幼苗死亡率也很高，但沙蒿和油蒿的幼苗死亡率很低，因此逐渐取代了沙米，成为固定、半固定沙丘上的主要物种。

关键词: 土壤类型, 沙埋深度, 植物种子, 出苗率, 死亡率, 腾格里沙漠

Abstract: Agriophyllum squarrosum, Artemisia sphaerocephala and Artemisia ordosica are the dominant plant species at different stages of vegetation succession in the southern Tengger Desert. A fieldpot experiment was conducted at Wuwei Station for Desert Control Research in summer 2009. Response of the seedling emergence rates of the 3 species to two soil types (sand and sandy loam) and seven sand burial depths (0, 1, 2, 3, 4, 6 cm and 8 cm) was measured. Seedling emergence rate of A. squarrosum seeds buried at 0 cm in sand was the lowest, that of the 3 species seeds buried at 1 and 2 cm in sand was the highest, and that of the 3 species seeds buried in sandy loam was lower than that in sand. The optimal burial depth for seedling emergence of A. squarrosum and A. ordosica was decreased from 2 cm in sand to 1 cm in sandy loam. In sand, A. squarrosum seeds at all sand burial depths emerged, the seedling emergence rate was high, and the seedling mortality rate was low; thus, A. squarrosum could be the dominant species for sand dunes. In sandy loam, however, the emergence speed of A. squarrosum seeds at sand burial depths of 0-4 cm was slow, and the seedling mortality rate was higher than that of other two species. Thus, A. sphaerocephala and A. squarrosum replaced A. squarrosum on fixed and semifixed dunes at the seeding stage.

Key words: soil type, sand burial depth, seed, seedling emergence rate, mortality rate, Tengger Desert

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