模拟氮沉降对刺槐及沙棘凋落叶分解的影响

doi:10.11913/PSJ.2095-0837.2021.40398

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摘要

以黄土高原主要造林树种刺槐（Robinia pseudoacacia L.）和沙棘（Hippophae rhamnoides L.）的凋落叶为研究对象，分别在5、10、20 g·m^-2·yr^-1模拟氮沉降的条件下进行6个月的室内模拟分解实验，研究氮沉降对凋落叶分解过程和养分释放率的影响。结果显示： 5和10 g·m^-2·yr^-1强度的氮沉降（LN和MN）显著促进了刺槐凋落叶的分解，中强度氮沉降促进作用更显著；所有强度的氮沉降均显著抑制了沙棘凋落叶的分解，20 g·m^-2·yr^-1强度（HM）的氮沉降对前半程分解的抑制作用更显著。在短期实验下，LN和HN处理显著抑制了刺槐凋落叶氮的释放，LN和MN处理抑制磷的释放；MN促进沙棘凋落叶氮的释放，而HN处理则为抑制作用，所有氮沉降处理对沙棘凋落叶磷释放均显著抑制；总体上，高强度氮沉降对养分释放的抑制作用更强。凋落叶基质质量（主要体现于碳、氮、磷和凝缩单宁含量以及木质素/氮比）和氮沉降强度均是影响氮沉降对凋落叶分解和氮磷释放结果的关键因素，且两者存在显著的交互作用。

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关键词 ：氮沉降, 人工林凋落叶, 分解速率, 养分释放

Abstract：

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.

Key words： Simulated nitrogen deposition Artificial forest litter Decomposition rate Nutrient release

收稿日期: 2021-01-06

ZTFLH:

S718.5

基金资助:

国家自然科学基金项目（31800370）；延安大学科研项目（YDY2020-34）；国家/延安大学大学生创新创业训练计划（S202010719013；D2020096）；延安大学研究生科研创新项目（YCX2020071）。

通讯作者: 张晓曦 E-mail: zhangxiaoxi712100@gmail.com

作者简介: 张晓曦(1990-),男,博士,副教授,研究方向为森林生态与污染生态(E-mail:zhangxiaoxi712100@gmail.com)。

引用本文:

张晓曦, 王丽洁, 纪永康. 模拟氮沉降对刺槐及沙棘凋落叶分解的影响[J]. 植物科学学报, 2021, 39(4): 398-406. 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.. Plant Science Journal, 2021, 39(4): 398-406.

链接本文:

http://www.plantscience.cn/CN/10.11913/PSJ.2095-0837.2021.40398 或 http://www.plantscience.cn/CN/Y2021/V39/I4/398

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