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Zhang Xiao-Xi, Wang Li-Jie, Ji Yong-Kang. Effects of simulated nitrogen deposition on decomposition of foliar litter of Robinia pseudoacacia L. and Hippophae rhamnoides L.[J]. Plant Science Journal, 2021, 39(4): 398-406. DOI: 10.11913/PSJ.2095-0837.2021.40398
Citation: Zhang Xiao-Xi, Wang Li-Jie, Ji Yong-Kang. Effects of simulated nitrogen deposition on decomposition of foliar litter of Robinia pseudoacacia L. and Hippophae rhamnoides L.[J]. Plant Science Journal, 2021, 39(4): 398-406. DOI: 10.11913/PSJ.2095-0837.2021.40398

Effects of simulated nitrogen deposition on decomposition of foliar litter of Robinia pseudoacacia L. and Hippophae rhamnoides L.

  • Robinia pseudoacacia L. and Hippophae rhamnoides L. are two main tree species used in the artificial afforestation of the Loess Plateau. In the present study, the decomposition of the foliar litter of these two species was examined under different nitrogen (N) deposition. Specifically, a six-month indoor litter decomposition experiment was carried out under control and simulated N deposition (5, 10, and 20 gN ·m-2·yr-1) to detect the effects on litter decomposition and nutrient release. Results showed that:(1) 5 and 10 g·m-2·yr-1 N deposition (LN and MN) significantly accelerated the decomposition of R. pseudoacacia litter, with the MN treatment being more significant. All N deposition treatments significantly inhibited the decomposition of H. rhamnoides litter, and 20 g·m-2·yr-1 N deposition (HM) exhibited a more significant inhibitory effect on the first half of decomposition. (2) The LN and HN treatments significantly inhibited the release of N from R. pseudoacacia litter, while the LN and MN treatments inhibited the release of phosphorus (P); MN accelerated the release of N from H. rhamnoides litter, while HN treatment induced significant inhibition. All N deposition treatments markedly reduced the release of P from H. rhamnoides litter. In general, high-intensity N deposition exhibited stronger inhibitory effects on litter nutrient release. (3) Differences in the litter substrate quality (i.e., carbon (C), N, P, and condensed tannin contents and lignin to N ratio) and the intensity of N deposition were key factors affecting the decomposition of litter and the release of N and P, and there were significant interactions between these two factors.
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