中国沙漠 ›› 2018, Vol. 38 ›› Issue (1): 1-7.DOI: 10.7522/j.issn.1000-694X.2017.00091

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赵文智1, 郑颖1,2, 张格非1   

  1. 1. 中国科学院西北生态环境资源研究院 中国生态系统研究网络临泽内陆河流域研究站/内陆河流域生态水文重点实验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2017-08-02 修回日期:2017-09-08 出版日期:2018-01-20 发布日期:2018-01-20
  • 作者简介:赵文智(1966-),男,陕西定边人,研究员,主要从事恢复生态和生态水文学研究。
  • 基金资助:

Self-organization Process of Sand-fixing Plantation in A Desert-oasis Ecotone, Northwestern China

Zhao Wenzhi1, Zheng Ying1,2, Zhang Gefei1   

  1. 1. Linze Inland River Basin Research Station/Key Laboratory of Inland River Basin Ecohydrology, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-08-02 Revised:2017-09-08 Online:2018-01-20 Published:2018-01-20

摘要: 在对植被自组织过程研究进展评述的基础上,研究了河西走廊荒漠绿洲边缘人工固沙植被格局40年来自组织及种群自疏过程,发现在干旱区,特别是降水量200 mm以下的荒漠区,绿洲边缘雨养或者降水和地下水共同维系的沙丘人工植被也会发生自组织过程,原来基本均匀栽植的植被出现斑块化,最大斑块面积、斑块密度、斑块聚集度在20~30 a出现,但种群自疏过程并未遵循随植被发育年龄变化的规律,而与生境与绿洲的距离及生境地下水埋深显著相关。未来应加强在气候变化和人类干扰条件下植被格局发生突变的阈值范围的研究,也应加强干旱区人工植被自组织过程及其变化等的研究。

关键词: 自组织, 植被格局, 人工固沙植被, 梭梭, 绿洲边缘

Abstract: The two-phase mosaics of vegetation alternating with bare ground, was frequently observed in arid ecosystem. Theoretical studies suggest that this range of spatial patterns is the result of self-organization as a consequence of resource redistribution. On the basis of the review of self-organized process of vegetation, the spatial patterns and self-thinning process of Haloxylon ammodendron plantation for more than 40 years were analyzed in an oasis-desert ecotone in the Hexi Corridor. Results showed that a self-organized process of sand-fixing plantation would also take place in arid areas especially where precipitation is less than 200 mm. The overall spatial pattern of H. ammodendron shifted from initially uniform distribution to clustered, the landscape patches are becoming fragmented. But the self-thinning process of H. ammodendron plantation don't follow the natural order of the developmental stages, it is most relevant to the distance between the habitats of H.ammodendron and oasis marginal, and the groundwater depth in the habitats of H.ammodendron plantation. Ecosystem may abruptly shifted from one alternative stable state to another one, accompanied with great changes, under climate change and exacerbated human disturbance, the research of threshold range of vegetation pattern regime shift should be strengthened in the future, and the research of self-organized process of the sand-fixing plantation in the arid areas should also be strengthened.

Key words: self-organization process, vegetation patterns, sand-fixing plantation, Haloxylon ammodendron, desert-oasis ecotone