| 沙坡头人工固沙区草本层片组成及其动态研究 |
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| 引用本文： | 袁建立,张景光,王刚.沙坡头人工固沙区草本层片组成及其动态研究[J].中国沙漠,2002,22(6):623-627. |
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| 作者姓名： | 袁建立 张景光 王刚 |
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| 作者单位： | 1. 兰州大学,干旱农业生态国家重点实验室,甘肃,兰州,730000
2. 中国科学院,寒区旱区环境与工程研究所沙坡头沙漠试验研究站,甘肃,兰州,730000 |
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| 基金项目： | 中国科学院沙坡头沙漠试验研究站开放基金 ( 2 0 0 0 0 3)资助 |
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| 摘 要： | 通过跟踪观测一年生植物层片在一个生长周期内种类组成及其重要值的变化,并分析变化的生态学机理,得出如下结论:①在固沙区草本层片内,小画眉草的多度、盖度和重要值在群落中所占比例较大,是群落优势种;②在充足的降雨后,一年生植物都突发性萌发,但随着降雨的减少,层片内的一年生植物种群都呈衰退之势,其中小画眉草和虎尾草种群急剧减少,狗尾草、雾冰藜和虫实种群减少幅度不大.在生长后期由于降雨增多且较为均匀,层片内各物种种群数量变化不大,各自完成生活史;③狗尾草、雾冰藜和虫实在整个生长季节种群的数量和频度变化幅度较小,其相对盖度随着时间的推移呈渐次增长之势;④草本层片的变化动态与降雨有较大的相关性.
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| 关 键 词： | 沙坡头 一年生植物 层片 动态 |
| 文章编号： | 1000-694X(2002)06-0623-05 |
| 修稿时间： | 2002年7月16日 |
Structure and Dynamics of Herbage Synusia in Sapotou Planted Vegetation for Fixing Sand Dunes |
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| YUAN Jian\|li ,ZHANG Jing\|guang ,WANG Gang.Structure and Dynamics of Herbage Synusia in Sapotou Planted Vegetation for Fixing Sand Dunes[J].Journal of Desert Research,2002,22(6):623-627. |
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| Authors: | YUAN Jian\|li ZHANG Jing\|guang WANG Gang |
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| Institution: | YUAN Jian\|li 1,ZHANG Jing\|guang 2,WANG Gang 1 |
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| Abstract: | The species structure and importance value dynamics of annual plants in herbage synusia during a growth period have been observed, and the ecological mechanisms of these changes have been analyzed also. The conclusions are as follows: (1) \%Eragrostis poaeoides\% is the dominant species in herbage synusia, and it contributes more than other species in individual number, coverage and importance value; (2) A lot of annual plants seeds germinate after sufficient rain, but all annual plant populations decline along with lack of rainfall. \%Eragrostis poaeoides\% and \%Chloris virgata\% decrease more than \%Setaria ruthenica\% viridis, \%Bassia dasyphylla\% and \%Corispermum declinatum\%. The amount of every species in synusia change little in the later of growth period because of more rainfall. (3) The amount and frequency of \%Setaria ruthenica\% viridis, \%Bassia dasyphylla\% and \%Corispermum declinatum \%change little through whole growth season and their relatively coverage increase along with time. (4) Structures and dynamics of herbage synusia are correlated with rainfall. |
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| Keywords: | Sapotou annual plant synusia dynamic |
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