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Forest and Grassland Resources Research ›› 2025›› Issue (2): 68-78.doi: 10.13466/j.cnki.lczyyj.2025.02.007

• Research paper • Previous Articles     Next Articles

Mass loss characteristics of mixed decomposition of leaf litter in burned areas of high-altitude forests

LI Xun1,2(), ZHANG Yan1,2(), PENG Bin1,2   

  1. 1. Key Laboratory of Ecological Protection and Characteristic Industry Cultivation in Hengduan Mountain Area at Sichuan Minzu College of Sichuan,Kangding 626001,Sichuan,China
    2. Key Laboratory of Ecological Protection and Characteristic Industry Cultivation in Hengduan Mountain Area at Sichuan Minzu College of Garzê Prefecture,Kangding 626001,Sichuan,China
  • Received:2024-12-19 Revised:2025-03-02 Online:2025-04-28 Published:2025-12-04

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Abstract:

The area in the northwest Sichuan Province with the most frequent forest fires significantly affects the decomposition process of leaf litter in the forest ecosystem.However,the changes in the decomposition rate and mixed decomposition effect of leaf litter after forest fires are still unclear.Therefore,non-burned forest areas were used as controls,and typical native tree species such as Pinus densata,Quercus semecarpifolia,and Abies fabri were selected as research objects.The leaf litter of these three tree species were combined into 17 treatments according to different tree species combinations and mixing ratios for field decomposition experiments.The results show that:1) The mass loss rate of leaf litter showed a higher trend in burned areas than in non-burned areas,and the difference between the two increases with the extension of decomposition period.2) The mass loss rate of most leaf litter in burned and non-burned areas showed a faster decomposition rate in the early stage of 0-4 months,followed by a decrease in the later stage of 4-8 months,and then an increase in mass loss rate after 16 months of decomposition.3) The synergistic effect of leaf litter mass loss in burned areas was stronger than that in non-burned areas,and with the extension of decomposition period,the synergistic effect of leaf litter mass loss in burned areas was enhanced,while the antagonistic effect was weakened.The research results indicate that:compared to non-burned areas,the mass loss rate and synergistic effect of mixed decomposition of leaf litter in burned areas were enhanced.Compared to litter from a single tree species,mixing the leaf litter of Quercus semecarpifolia and Abies fabri in a ratio of 3∶1,and mixing the leaf litter of Pinus densata and Quercus semecarpifolia in a ratio of 1∶3,was more conducive to leaf decomposition,thus promoting the material cycle of degraded forest ecosystems.

Key words: burned forest areas, native tree species, mixed decomposition of leaf litter, mass loss rate, non-additive effect

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