三种一年生藜科沙生植物出苗对沙埋深度和水分条件的响应

草业学报 ›› 2009, Vol. 18 ›› Issue (2): 122-129.

三种一年生藜科沙生植物出苗对沙埋深度和水分条件的响应

罗亚勇^1,2,赵学勇¹,黄迎新^1,2,左小安^1,2,王少昆^1,2,张永锋³

1.中国科学院寒区旱区环境与工程研究所,甘肃兰州 730000;
2.中国科学院研究生院,
北京 100049;
3.甘肃省灵台县西屯中学,甘肃平凉 744403

收稿日期:2008-04-18 出版日期:2009-04-20 发布日期:2009-04-20
作者简介:罗亚勇(1983-),男,甘肃平凉人,在读博士。 E-mail:luoyy816@126.com
基金资助:
国家自然科学基金项目(40601008),中国科学院资环局方向性项目(KZCX2-YW-431)和中国科学院寒区旱区环境与工程研究所创新课题(O65044400)资助。

Seedling emergence of three Chenopodiaceae annuals in response to different sand burial depths and irrigation regimes

LUO Ya-yong^1,2, ZHAO Xue-yong¹, HUANG Ying-xin^1,2, ZUO Xiao-an^1,2,
WANG Shao-kun^1,2, ZHANG Yong-feng³

1.Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering
Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China;
2.Graduate
University of Chinese Academy of Sciences, Beijing 100049, China;
3.High School
of Lingtai County in Gansu Province, Pingliang 744403, China

Received:2008-04-18 Online:2009-04-20 Published:2009-04-20

摘要/Abstract

摘要： 通过盆栽控制试验,研究了沙米、大果虫实和长穗虫实3种一年生沙生植物在4个模拟降水水平(A、B、C和D)和6种埋深水平(0,10,20,30,40和50 mm)的出苗情况。结果表明,3种植物种子均没有休眠现象。沙米和长穗虫实均在10 mm埋深处的出苗率最大,而大果虫实在30 mm埋深处的出苗率最大,沙米、大果虫实和长穗虫实,各降水处理的平均出苗率分别为50.63％,77.29％和75.21％。在沙土表面的种子,沙米萌发受强烈抑制,而其余2种植物在降水较多的A、B和D处理下萌发较多但成苗较少。这3种植物耐埋深的大小依次为:大果虫实>沙米>长穗虫实。降水量越大,其出苗率越高,沙米和大果虫实单次强降水下其种子出苗率大于等量的多次少量降水的积累,但是长穗虫实相反。这表明在干旱半干旱沙地,降水是调节季节性种子出苗最重要的决定因素,种子在沙土中的垂直分布决定了降水后种子萌发的比例并有助于维持土壤种子库。

Abstract: The interactive effects of irrigation and seed burial depth in sand on seedling emergence and seedling survival in 3 annuals (Agriophyllum squarrosum, Corispermum macrocarpum and C. elongatum) which commonly grow on sand dunes in the experimental region of Inner Mongolia were investigated. Seedling emergence was examined for seeds sown on the surface, or at depths of 10, 20, 30, 40 and 50 mm in sand-filled pots. There were 4 different watering regimes in pots was: Treatments A (30 mm, initial irrigation), B (10 mm), C (10 mm), and D (30 mm). Subsequently, water equivalent to 5 mm of irrigation at 1, 2, or 6-d intervals was added to treatments A, B, and C, respectively, but no further irrigation was applied to treatment D. No seed dormancy was found in any species. A. squarrosum and C. elongatum seedling emergence was most favoured when seeds were buried at a depth of 10 mm, but for C. macrocarpum 30 mm was the most favourable depth. The average of the 4 different irrigation regimes for the 3 species was 50.63％ (A. squarrosum), 77.29％ (C. macrocarpum), and 75.21％ (C. elongatum). When seeds sown on the sand surface were irrigated, seed germination of A. squarrosum, was considerably suppressed, but many seeds of C. macrocarpum and C. elongatum, germinated though few seedlings survived due to water deficiency. The effectiveness of sand burial depth was decreased in the order C. macrocarpum, A. squarrosum and C. elongatum. The more irrigation, the greater the seedling emergence in all species but it was more after one heavy irrigation than after an accumulation of several light irrigations for A. squarrosum and C. macrocarpum , but was vice versa for C. elongatum. It is suggested that precipitation is the most crucial factor in determining the seasonal emergence of seedlings of the three species tested in the field. The vertical distribution of seeds in sand determines the proportion of seeds that germinate after precipitation and acts to maintain seed banks over multiple years.

中图分类号:

Q945.3

罗亚勇,赵学勇,黄迎新,左小安,王少昆,张永锋. 三种一年生藜科沙生植物出苗对沙埋深度和水分条件的响应[J]. 草业学报, 2009, 18(2): 122-129.

LUO Ya-yong, ZHAO Xue-yong, HUANG Ying-xin, ZUO Xiao-an,
WANG Shao-kun, ZHANG Yong-feng. Seedling emergence of three Chenopodiaceae annuals in response to different sand burial depths and irrigation regimes[J]. Acta Prataculturae Sinica, 2009, 18(2): 122-129.

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