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Acta Prataculturae Sinica ›› 2020, Vol. 29 ›› Issue (2): 92-102.DOI: 10.11686/cyxb2019212

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Effects of soil particle composition and adhesives on seed germination and seedling growth of Neyraudia reynaudiana

ZHENG Hui-xin1,2,3, HUANG Xiao1,2,3, CAI Li-ping1,2,3,*, HOU Xiao-long1,2,3, ZHOU Chui-fan1,2,3, ZENG Si-yi1,2,3, WEI Meng-yu1, QIU Qing-shu1   

  1. 1.College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
    2.Key Laboratory of National Forestry and Grassland Administration on Soil and Water Conservation of Red Soil Region in Southern China, Fuzhou 350002, China;
    3.Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
  • Received:2019-03-25 Revised:2019-06-05 Online:2020-02-20 Published:2020-02-20
  • Contact: E-mail: fjclp@126.com

Abstract: In the red soil erosion region of southern China, coarse soil surface texture (high proportions of sand and fine gravel) seriously affects soil nutrient and water holding capacity, and therefore plant growth, and is a constraint to vegetation restoration. Soil adhesive additives can improve the soil environment and enhance plant seed germination and seedling growth. This study investigated the effects of differing soil particle size composition and addition of soil adhesive (polyacrylamide, PAM) on seed germination and seedling growth of Neyraudia reynaudiana. The experiment comprised different soil particle compositions to simulate five different soil erosion levels, and four different soil conditions created by different PAM concentrations added to the soil (0, 0.125, 0.250 and 0.500 g·kg-1). It was found that both the concentration of PAM and the soil particle composition significantly influenced seed germination and seedling growth of N. reynaudiana. Addition of PAM increased the germination rate and shortened the emergence time of N. reynaudiana by 1-2 days. The low soil adhesive concentration (0.125 g·kg-1) was optimal for seed germination, while high soil adhesive concentrations (0.250 or 0.500 g·kg-1) were best for seedling growth. The effect of PAM on seedling growth depended on soil particle composition. The soil with 25% coarse particle content was propitious for seed germination, and a high proportion of coarse-grained soil was beneficial for seedling growth. With increasing proportion of coarse particles, the seedling shoot height increased. The results of this research provide a theoretical guidelines for vegetation restoration and slope treatment using N. reynaudiana in the red soil erosion region.

Key words: Neyraudia reynaudiana, soil particle composition, adhesives, germination percentage, seedling