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生态学杂志 ›› 2004, Vol. ›› Issue (2): 45-49.

• 研究报告 • 上一篇    下一篇

科尔沁沙地围封沙质草甸土壤种子库特征的研究

赵丽娅, 李锋瑞, 张华, 王先之   

  1. 中国科学院寒区旱区环境与工程研究所, 兰州, 730000
  • 收稿日期:2002-10-19 修回日期:2003-03-16 出版日期:2004-04-10
  • 通讯作者: 赵丽娅,女,1975年,山西人,在读博士.主要从事旱区恢复生态学和农业生态学研究.
  • 基金资助:
    中国科学院“百人计划”项目;中国科学院寒区旱区环境与工程研究所知识创新工程项(210097);国家重点基础发展计划资助项目(G2000048704)

Characteristics of the soil seed bank at the fenced sandy meadow in Horqin Sandy Land

ZHAO Liya, LI Fengrui, ZHANG Hua, WANG Xianzhi   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2002-10-19 Revised:2003-03-16 Online:2004-04-10

摘要: 科尔沁沙地沙质草甸围封5年后土壤种子库中植物种类有38种,其中一、二年生草本植物24种,多年生草本植物9种,灌木5种。土壤种子库密度为(13855±1651)粒·m-2,其中,一、二年生草本植物所占的比例最大为96.58%,前5种一、二年生草本植物黄蒿、灰绿藜、猪毛菜、狗尾草和画眉草占总数的87.20%,而多年生草本植物和灌木类种子库密度分别占0.94%和2.48%。若以单子叶和双子叶植物统计,单子叶植物种子数占13.13%,双子叶植物的种子数占86.87%,其中豆科植物仅占2.83%。土壤种子库中所有植物种的密度与其相对应的地面植物种的密度呈显著非完全相关性,其关系可用三次曲线来表示。从种子库组成分析,已围封5年的沙质草甸植被仍处在黄蒿-杂类草混合植被阶段。

关键词: 氮素流失, 污染, 径流, 淋溶, 控制策略

Abstract: The soil seed bank of the sandy meadow after 5 years enclosure of was studied. The results showed that the number of plant species was 38, among which, that of annuals and biennials,that of perennials and that of brushes was 24,9 and 5,respectively. The overall density of the soil seed bank was 13855?1651 grains穖-2 ,among which, that of annuals and biennials was 96.58% of all the grains,87.20% was the annuol and biennial seeds of Artemisia scoparia,Chenopodium glaucum,Salsola collina,Setaria viridis and Eragrostis pilosa. Only 0.94% and 2.48% of the grains were those of perennials and brushes respectively. If divided into monocotyledoneae and dicotyledoneae, the number of seeds of the former accounted for 13.13% of that of total seeds while that of the later constituted 86.87%. The Leguminecae species comprised 2.83%. Regression indicated that the relationship between density of the soil seed bank and that of associated vegetation could be described by a cubic curve. The fenced sandy meadow vegetation would be in the stage of mixture of A. scoparia. et and forbs.

Key words: Nitrogen loss, Leaching, Pollution, Runoff, BMP practices

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