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中国沙漠  2015, Vol. 35 Issue (2): 338-344    DOI: 10.7522/j.issn.1000-694X.2014.00013
生物与土壤     
埋藏深度对梭梭(Haloxylon ammodendron)种子萌发及幼苗生长的影响
王国华1,2, 赵文智1
1. 中国科学院寒区旱区环境与工程研究所 中国科学院内陆河流域生态水文重点实验室/中国生态系统研究网络临泽内陆河流域研究站, 甘肃 兰州 730000;
2. 中国科学院大学, 北京 100049
Effects of Sand-burying on Seed Germination and Seedling Growth of Haloxylon ammodendron
Wang Guohua1,2, Zhao Wenzhi1
1. Key Laboratory of Inland River Ecohydrology/Linze Inland River Basin Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China
 全文: PDF(1771 KB)  
摘要:

研究了不同沙埋深度对于梭梭(Haloxylon ammodendron)种子萌发和幼苗生长、存活的影响,判断梭梭种子萌发后,幼苗能否成活以实现梭梭种群的更新。在自然条件下设置0、1、2、3、4、5 cm深度沙埋处理,每个处理5个重复,对梭梭种子萌发和幼苗生长进行了全生长季观测。结果表明:梭梭种子为喜光种子,种子萌发率随着沙埋深度的增加呈减小趋势,萌发最佳沙埋深度为1 cm,萌发率为39.2%,4 cm已是萌发的最大沙埋深度; 幼苗存活率随着沙埋深度的增加而增加,4 cm沙埋深度出土幼苗存活率为100%,而0 cm萌发出土的幼苗成活率为0;综合考虑种子萌发率和幼苗存活率,2 cm为最佳沙埋深度,这个沙埋深度出土的幼苗对于梭梭种群更新贡献最大。幼苗生长高度受沙埋深度的影响显著,在1~4 cm沙埋深度范围内,浅层沙埋出苗快但生长慢,而深层沙埋出苗慢而生长快,幼苗最大生长高度在4 cm沙埋,第一年生长季最大生长高度为21.5 cm,幼苗最小生长高度在0 cm,第一年生长季最大生长高度仅为2.76 cm。

关键词: 先锋植物绿洲种群更新    
Abstract:

This paper studied the effects of sand-burying on the seed germination and seedling emergence and growth of Haloxylon ammodendron in a typical arid desert region under nature conditions. Six treatments of sand-burying of depths 0, 1, 2, 3, 4 cm and 5 cm were designed and each treatment included five replicates. Results demonstrated that the seedling emergence decreased with increasing sand-burying depth. The optimal sand-burying depth for seedling emergence of H. ammodendron was 1 cm and the seedling emergence rate at this depth was 39.2%. The depth of 4 cm was the maximum depth for H. ammodendron to emerge. However, the seedling growth rate and survival rate of H. ammodendron increased with increasing sand-burying depth. The seedling survival rate of H. ammodendron at 4 cm burial depth was 100% and the survival rate at 0 cm was 0. Considering both seed germination rate and seedling survival rate, the optimal burial depth was 2 cm and the seedlings at 2 cm burial depth were the main source for population regeneration. Seedling height was significantly affected by the sand burial depth. At the same period,the maximum seedling height of H. ammodendron was at 4 cm sand burial depth and the minimum was at 0 cm. In the first year, the seedling height of H. ammodendron unearthed from 4 cm was 21.5 cm and the height of seedling unearthed from surface was only 2.76 cm.

Key words: sand-fixing pioneer plant    desert oasis    population regeneration
收稿日期: 2013-12-17 出版日期: 2015-03-20
:  Q948.113  
基金资助:

国家杰出青-科学基金项目(41125002)

通讯作者: 赵文智(Email: zhaowzh@lzb.ac.cn)     E-mail: zhaowzh@lzb.ac.cn
作者简介: 王国华(1984-), 男, 山西省大同人, 博士研究生, 主要研究方向为生态水文学。Email: wang_gh123@163.com
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引用本文:

王国华, 赵文智. 埋藏深度对梭梭(Haloxylon ammodendron)种子萌发及幼苗生长的影响[J]. 中国沙漠, 2015, 35(2): 338-344.

Wang Guohua, Zhao Wenzhi. Effects of Sand-burying on Seed Germination and Seedling Growth of Haloxylon ammodendron. JOURNAL OF DESERT RESEARCH, 2015, 35(2): 338-344.

链接本文:

http://www.desert.ac.cn/CN/10.7522/j.issn.1000-694X.2014.00013        http://www.desert.ac.cn/CN/Y2015/V35/I2/338

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