氮沉降对长白山3种苔原类型凋落物早期分解的影响

水新利; 白云玉; 张英洁; 许嘉巍; 靳英华; 陶岩; 赵琛; 张慧慧; 刘丽杰

doi:10.11913/PSJ.2095-0837.2021.60580

氮沉降对长白山3种苔原类型凋落物早期分解的影响

1. 东北师范大学地理科学学院, 长春 130024;
2. 长白山科学研究院, 吉林延边 133613

基金项目:

国家自然科学基金项目（41571078）

详细信息

作者简介:
水新利(1993-),女,硕士研究生,研究方向为生态区域环境变化(E-mail:shuixl478@nenu.edu.cn)

通讯作者:
靳英华,E-mail:jinyh796@nenu.edu.cn

中图分类号: S718.5
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出版历程
- 收稿日期: 2021-05-23
- 修回日期: 2021-06-21
- 网络出版日期: 2022-10-31
- 发布日期: 2021-12-27

Effects of nitrogen deposition on early decomposition of three tundra litter types in Changbai Mountains

1. School of Geographical Sciences, Northeast Normal University, Changchun 130024, China;
2. Changbai Mountain Academy of Sciences, Yanbian, Jilin 133613, China

Funds:

supported by a grant from the National Natural Science Foundation of China(41571078)

摘要

摘要: 本研究以牛皮杜鹃(Rhododendron aureum Georgi)凋落物、小叶章(Deyeuxia angustifolia (Kom.)Y. L. Chang)凋落物及两者的混合物作为长白山3种苔原类型的代表性凋落物，在人工气候箱中研究不同氮沉降量增加对凋落物早期分解的影响。结果显示：(1)小叶章凋落物质量高，易分解；牛皮杜鹃凋落物质量低，难分解；牛皮杜鹃-小叶章混合凋落物分解程度居中，且存在非加和效应的协同促进作用；(2)氮沉降增加对牛皮杜鹃和小叶章凋落物的分解均有显著促进作用，但对牛皮杜鹃-小叶章混合凋落物的分解影响不明显；(3)早期分解过程中，3种凋落物的总碳和总磷呈释放状态，木质素呈现富集状态；牛皮杜鹃总氮和纤维素呈富集状态，而小叶章和混合凋落物总氮和纤维素呈释放状态；(4)中氮处理对牛皮杜鹃凋落物总磷释放具有显著抑制作用；而高氮处理对小叶章和混合凋落物总磷释放具有显著促进作用。研究结果表明，氮沉降增加了凋落物的分解速度。
- 氮沉降 /
- 凋落物分解 /
- 长白山 /
- 苔原带
Abstract: Rhododendron aureum litter, Deyeuxia angustifolia litter, and their mixture were selected as three tundra litter types from the Changbai Mountains. The effects of different nitrogen deposition on early-stage litter decomposition were studied in an artificial climate chamber. Results showed that: (1) D.angustifolia litter was of high quality and decomposed easily, R. aureum litter was of low quality and decomposed poorly, while the mixed litter showed moderate decomposition, with synergistic promotion of non-additive effects in the decomposition process; (2) Increased nitrogen deposition promoted decomposition of Rhododendron aureum and Deyeuxia angustifolia litter significantly, but the decomposition effect of mixed litter was not obvious; (3) At the early stage of decomposition, the three types of litter were all in the releasing state of total carbon and total phosphorus, and the lignin presented an enriched state; the total nitrogen and cellulose of R. aureum were in an enriched state, and the total nitrogen and cellulose of D. angustifolia and mixed litter were in a released state; (4) Medium nitrogen treatment significantly inhibited the release of total phosphorus from R. aureum litter, while high nitrogen treatment significantly promoted the release of total phosphorus from D. angustifolia and mixed litter. These results show that nitrogen deposition can increase the decomposition of litter.
- Nitrogen deposition /
- Litter decomposition /
- Changbai Mountains /
- Tundra

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