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中国沙漠 ›› 2024, Vol. 44 ›› Issue (1): 151-160.DOI: 10.7522/j.issn.1000-694X.2023.00073

• • 上一篇    下一篇

科尔沁沙质草地植物群落对增温的响应

包天玲1,3(), 刘继亮2,3, 苑峰4, 李寅龙5, 贾振宇6, 潘成臣1,3()   

  1. 1.中国科学院西北生态环境资源研究院,奈曼沙漠化研究站,甘肃 兰州 730000
    2.中国科学院西北生态环境资源研究院,临泽内陆河流域研究站,甘肃 兰州 730000
    3.中国科学院大学,北京 100049
    4.内蒙古草业技术创新中心有限公司,内蒙古 呼和浩特 010050
    5.内蒙古蒙草土壤科技有限责任公司,内蒙古 呼和浩特 010010
    6.蒙草生态环境(集团)股份有限公司,内蒙古 呼和浩特 010010
  • 收稿日期:2023-05-22 修回日期:2023-07-03 出版日期:2024-01-20 发布日期:2023-12-26
  • 通讯作者: 潘成臣
  • 作者简介:潘成臣(E-mail: panchengchen@lzb.ac.cn
    包天玲(1996—),女,甘肃平川人,硕士研究生,主要从事干旱半干旱区生态学相关研究。E-mail: baotianling21@mails.ucas.ac.cn
  • 基金资助:
    国家自然科学基金项目(42377043);内蒙古自治区科技计划项目(2023YFHH0046)

Response of plant community to experimental warming in Horqin Sandy Land

Tianling Bao1,3(), Jiliang Liu2,3, Feng Yuan4, Yinlong Li5, Zhenyu Jia6, Chengchen Pan1,3()   

  1. 1.Naiman Desertification Research Station /, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.Linze Inland River Basin Research Station, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
    4.Inner Mongolia Caoye Technology Innovation Center Co. ,Ltd. ,Hohhot 010050,China
    5.Inner Mongolia Mengcao Soil Science and Technology Co. ,Ltd. ,Hohhot 010010,China
    6.Mengcao Ecological Environment (Group) Co. ,Ltd. ,Hohhot 010010,China
  • Received:2023-05-22 Revised:2023-07-03 Online:2024-01-20 Published:2023-12-26
  • Contact: Chengchen Pan

摘要:

全球变暖对植物群落结构及其功能有重要影响。草地生态系统的植物群落对变暖响应极为敏感,但其响应却表现出极大的不确定性。本文通过开顶式气室(Open top chamber,OTC)模拟增温实验,系统研究了科尔沁沙质草地植物群落对增温的响应。结果表明:(1)增温使黄蒿(Artemisia scoparia)和糙隐子草(Cleistogenes squarrosa)的比重分别显著增加了0.04和0.14,使狗尾草(Setaria viridis)的比重显著降低了0.12,改变了植物群落组成;(2)增温显著降低沙质草地植物物种丰富度、Simpson指数、Shannon-Wiener指数,且使植物群落、一年生和多年生草本植物的地上生物量分别显著减少22.71%、26.37%和20.10%;(3)增温改变沙质草地的关键类群和主要植物种间关系,使主要科植物间的相互作用减弱、连通性增加,导致植物群落结构稳定性下降;(4)沙质草地植物物种丰富度、Shannon-Wiener指数、生物量与土壤温度呈显著负相关,与土壤湿度呈显著正相关。总之,沙质草地植物群落对增温响应十分敏感,增温驱动的土壤水分及温度变化不仅降低了植物多样性,导致生物量下降,还会加剧沙质草地退化及其生态功能的下降。

关键词: 科尔沁沙质草地, 增温, 植物多样性, 生物量, 网络分析

Abstract:

Climate warming has important implications for plant community structure and function. Sandy grasslands are particularly vulnerable to global warming in arid and semi-arid regions. Here, we investigated the effects of experimental warming on plant communities in Horqin Sandy Land of Inner Mongolia, northern China. The results showed that experimental warming had significant impacts on plant community composition. Experimental warming caused a rapid increase in the proportion of Artemisia annua and Cleistogenes squarrosa, but a decrease in that of Setaria viridis. The warming significantly reduced species richness, Shannon-Wiener diversity index and Simpson diversity index, as well as the aboveground biomass of entire plant communities, annual and perennial herbs by 22.71%, 26.37% and 20.10%, respectively. Network complexity of plant communities decreased under warmed conditions. In conclusion, plant communities are very sensitive to global warming in Horqin sandy land. The declines in plant diversity and vegetation biomass caused by climate warming likely exacerbate the degradation of sandy grassland and the decline of ecological functions.

Key words: Horqin Sandy Land, warming, plant diversity, biomass, network analysis

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