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Chinese Journal of Applied Ecology ›› 2025, Vol. 36 ›› Issue (3): 703-710.doi: 10.13287/j.1001-9332.202503.002

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Effect of litters from Juglans mandshurica and Larix gmelinii on the growth of J. mandshurica seedlings

YANG Yibing, SHAN Chengfeng, SHEN Fangyuan, YANG Lixue*   

  1. Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, Engineering and Technology Research Centre for Northeast Native Tree Species-National Forestry and Grassland Administration, School of Forestry, Northeast Forestry University, Harbin 150040, China
  • Received:2024-09-30 Accepted:2025-01-09 Online:2025-03-18 Published:2025-05-15

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Abstract: We conducted a pot experiment to examine the effects of different proportions (CK: no litter; H10L0: Juglans mandshurica 10 g; H7L3: J. mandshurica 7 g + Larix gmelinii 3 g; H5L5: J. mandshurica 5 g + L. gmelinii 5 g; H3L7: J. mandshurica 3 g + L. gmelinii 7 g; H0L10: L. gmelinii 10 g) of J. mandshurica and L. gmelinii litter on nutrients and phenols content in the substrate, and on the growth and physiological characteristics of J. mandshurica seedlings. The results showed that litter input significantly affected ammonium nitrogen, available phosphorus, and phenols contents in the substrate. The content of substrate nutrients (except available phosphorus) was the highest when J. mandshurica and L. gmelinii litter were mixed in equal proportion (H5L5). The total phenols and water-soluble phenols contents in the substrate decreased as the proportion of L. gmelinii litter increased, while those of H0L10 treatment were significantly reduced by 22.7% and 25.3%, respectively. The addition of L. gmelinii litter could effectively promote the growth of J. mandshurica seedlings. The synthetical allelopathic index (MR) of H3L7 and H0L10 treatments was higher than that of H10L0 and H7L3 treatments, with the highest value under H0L10 treatment (MR=-0.07). Litter inputs significantly increased net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, and transpiration rate of J. mandshurica seedlings. The content of malondialdehyde (MDA) was the highest and net photosynthesis rate was the lowest in CK. Seedlings under H0L10 treatment had the best growth, with the lowest MDA content, and the highest net photosynthesis rate, which significantly increased 101.6%. The addition of L. gmelinii litter could alleviate the autotoxicity of J. mandshurica seedlings and stimulate their growth. The high litter proportion of L. gmelinii promoted the growth and physiological characteristics of J. mandshurica seedlings.

Key words: Juglans mandshurica, Larix gmelinii, litter, phenols, allelopathic effect evaluation, substrate nutrient, seedling growth