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Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (4): 193-201.DOI: 10.7522/j.issn.1000-694X.2024.00013

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Comparison of root architecture characteristics of Salsola collina in the southeast edge of Tengger Desert

Keer Lou1(), Wenjie Qu1, Lei Wang1, Xing Wang1, Yonggui Gao2, Xinguo Yang1()   

  1. 1.MOE Key Laboratory of Northwest Degraded Ecosystem Restoration and Reconstruction / Cultivation Base of State Key Laboratory of Northwest Land Degradation and Ecological Restoration / College of Ecological Environment,Ningxia University,Yinchuan 750021,China
    2.Zhongwei Gusha Forest Farm,Zhongwei Public Works Section of China Railway Lanzhou Bureau Group Co. ,Ltd. ,Zhongwei 755000,Ningxia,China
  • Received:2023-11-27 Revised:2024-01-05 Online:2024-07-20 Published:2024-08-29
  • Contact: Xinguo Yang

Abstract:

Root architecture reflects the absorptive capacity and utilization of plant resources, and is an important aspect to reveal the mechanism of vegetation regeneration, growth and adaptation in sandy land. In this study, Salsola collina under different surface conditions (quicksand, algal crusts (semi fixed sand), moss crusts (fixed sand)) in the southeast edge of Tengger Desert was selected as the research object. The traditional mining method was used to collect plant roots. Based on the quantitative root morphology index, the geometric topology and fractal theory were used to analyze the root configuration characteristics, The effects of land surface evolution on the root architecture of Salsola collina and its adaptation mechanism were discussed. The results showed that the ratio of root depth to width, the ratio of root to shoot, the specific root length and the specific surface area of Salsola collina decreased significantly from quicksand, algae crusts to moss crusts, while the horizontal range of root system increased significantly; The root topological index TI was 0.8125 (quicksand), 0.7107 (algal crusts), 0.6313 (moss crusts), which decreased gradually, and the root structure tended to change from fishtail branching structure to fork branching structure; The fractal dimension of roots increased significantly, but the fractal abundance of roots decreased significantly. In a word, with the increase of sand fixation degree and the evolution of surface crusting and covering conditions, the investment in root growth of Salsola collina decreased, and the spatial expansion ability degenerated. At the same time, the overall structure of the root system was further complicated. The root growth strategy changed from quantity to quality, and the resource utilization strategy changed to high competitiveness. This study can provide reference for vegetation restoration, species selection and allocation in desert areas.

Key words: Tengger Desert, Salsola collina, root architecture, topological index, fractal dimension

CLC Number: