干旱区研究

干旱区研究 ›› 2012, Vol. 29 ›› Issue (2): 208-212.

• 植物生态 • 上一篇    下一篇

半干旱风沙区黄柳幼苗生长发育对沙埋的响应

苗纯萍1,2, 李雪华1, 蒋德明1   

    1. 中国科学院 沈阳应用生态研究所,辽宁 沈阳 110016；
    2. 中国科学院 研究生院，北京 100049
  • 收稿日期:2011-11-08 修回日期:2011-12-07 出版日期:2012-03-15 发布日期:2012-04-10
  • 通讯作者: 李雪华. E-mail: lixuehua@iae.ac.cn
  • 作者简介:苗纯萍（1987-），女，山西太谷人，在读硕士，研究方向为植被恢复生态. E-mail: miaochunping316@163.com
  • 基金资助:

    国家自然科学基金（41071187）；国家林业局行业专项（201004023）

Response of Growth of Salix gordejevii Seedling to Sand Burial Depth in the Semiarid Aeolian Sand Field

 MIAO  Chun-Ping1,2,, LI  Xue-Hua1, JIANG  De-Ming1   

    1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2011-11-08 Revised:2011-12-07 Online:2012-03-15 Published:2012-04-10

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摘要： 以科尔沁沙地黄柳(Salix gordejevii)幼苗为研究对象，通过0 cm，10 cm，20 cm和40 cm 4个沙埋处理，研究其生长发育对沙埋的响应。结果表明：随着沙埋深度的增加，黄柳幼苗的死亡率增加，存活率下降。沙埋对黄柳幼苗的株高、相对高度增长率，分配到根、茎、叶的生物量和根冠比有显著影响，对绝对高度增长率和生物量无显著影响。轻度沙埋有利于黄柳幼苗高度增加，随着沙埋深度的增加，株高依然增加，相对高度生长率却下降。轻度沙埋使黄柳幼苗的生物量较多地分配到根，随着沙埋深度的增加，较多的生物量分配给地上部分，根冠比下降。说明黄柳幼苗可通过加快茎的生长或改变生物量的分配等方式维持光合作用能力，增加对沙埋的抵御能力。

关键词: 黄柳(Salix gordejevii), 幼苗, 沙埋, 存活率, 根冠比, 生物量, 科尔沁沙地

Abstract: Sand-burial controlled experiment was conducted to investigate the response of Salix gordejevii seedling growth, and the sand burial depths were varied from 0, 10 and 20 to 40 cm. The results show that the mortality of S. gordejevii was increased with increasing sand burial depth. There were some significant differences in the stem height, relative height growth rate, biomass allocated to roots, stems and leaves as well as the rootshoot ratio of seedlings in 4 treatments. There was no significant sand burial effect on absolute height growth rate and biomass accumulation. Slight sand burying promoted the growth of stem. With the increase of sand burial depth, the stem growth could be increased, but the relative height growth rate was decreased. The root biomass was increased to absorb water and nutrient under slight sand burial depth. More biomass was allocated to shoots with the increase of sand burial depth. These results reveal that the defense of S. gordejevii seedlings was increased by stem growing and biomass allocation so as to maintain photosynthesis by stem growing or allocating more biomass to shoots.  

Key words: Salix gordejevii, seedling, sand burial depth, survival rate, root-shoot ratio, biomass, Horqin sandy land