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Chinese Journal of Applied Ecology ›› 2022, Vol. 33 ›› Issue (10): 2711-2717.doi: 10.13287/j.1001-9332.202210.003

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Effects of warming on physicochemical property of Cunninghamia lanceolata branch and leaf litter in subtropical plantation

LI Ao-gui1,2, LIN Cheng-fang1,2*, HU Ming-yan1,2, LIU Xiao-fei1,2, SONG Hao-wei1,2, ZHANG Lei1,2, YANG Yu-sheng1,2   

  1. 1School of Geographical Sciences, Fujian Normal University/Cultivation Base of State Key Laboratory of Humid Subtraphical Mountain Ecology, Fuzhou 350007, China;
    2Sanming Forest Ecosystem and Global Change National Observation and Research Station of Fujian Province, Sanming 365000, Fujian, China
  • Received:2022-03-22 Revised:2022-04-27 Online:2022-10-15 Published:2023-04-15

Abstract: At the regional scale, substrate properties are the key factors driving litter decomposition rate. In this study, soil temperature was increased by buried heating cables to explore the impacts of climate warming on the physical and chemical properties in branch and leaf of Cunninghamia lanceolata litter. The results showed that after 5 years of soil warming (4 ℃), the contents of nitrogen (N), phosphorus (P) and water-soluble substance in branch litter increased by 35.2%, 40.8% and 7.6%, while that in leaf litter increased by 41.2%, 45.9% and 5.9%, respectively. The contents of carbon (C), cellulose and C/N in branch litter decreased by 5.1%, 11.6% and 28.8%, and in leaf litter decreased by 5.3%, 11.3% and 33.3%, respectively. Soil warming led to 29.8% increase in specific leaf area (SLA) and 40.7% decrease in tensile strength (LTS) of leaf litter. However, warming did not affect lignin content and pH value in both branch and leaf litter. 13C NMR and infrared spectrum analysis showed that the contents of amino acids, polysaccharides, polyphenols and aliphatic compounds in litter changed significantly after warming. Warming effect differed between litter organs, in that polysaccharides increased significantly only in leaf litter and the increase of amino acids in branch litter was greater than that in leaf litter. Overall, soil warming significantly changed the physical and chemical properties in C. lanceolata branch and leaf litter, which might accelerate the decomposition rate at the initial stage due to the increase of N, P contents and the decrease of LTS, but might decelerate the decomposition rate at the later stage due to an increase of complex polymers content in the litter.

Key words: soil warming, litter, physicochemical property, subtropical Cunninghamia lanceolata plantation