Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (10): 3318-3329.DOI: 10.11733/j.issn.1007-0435.2025.10.020

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Effects of Simulated Warming on Soil Carbon and Nitrogen Components Under Different Altitude Gradients in Qilian

WANG Ze-yue1, WANG Wen-ying1,3, XIONG You-cai2, CHEN Xiao-yue1, WANG Yu-xing1, MA Yan-mei1, YANG Fang-kun1   

  1. 1. College of Life Sciences, Qinghai Normal University, Xining, Qinghai Province 810008, China;
    2. College of Ecology, Lanzhou University, Lanzhou, Gansu Province 730000, China;
    3. Academy of Plateau Science and Sustainability, People's Government of Qinghai Province, Beijing Normal University, Xining, Qinghai Province 810008, China
  • Received:2024-11-26 Revised:2025-01-05 Published:2025-10-17

祁连山不同海拔梯度下模拟增温对土壤碳氮组分影响研究

王泽岳1, 王文颖1,3, 熊友才2, 陈晓玥1, 王宇星1, 马燕梅1, 杨方堃1   

  1. 1. 青海师范大学生命科学学院, 青海 西宁 810008;
    2. 兰州大学生态学院, 甘肃 兰州 730000;
    3. 青海省人民政府-北京师范大学高原科学与可持续发展研究院, 青海 西宁 810008
  • 通讯作者: 王文颖,E-mail:wangwy0106@163.com
  • 作者简介:王文颖,E-mail:wangwy0106@163.com
  • 基金资助:
    国家重点研发计划(2023YFF1304305);青海省科技厅自然科学基金项目(2025-ZJ-969T);111引智基地(D23029)资助

Abstract: To clarify the effects of simulated warming on soil carbon and nitrogen components in the altitude gradients (2700-4100 m) of Qilian Mountains, soil samples from non-warmed and warmed treatments across different soil layers were collected to analyze carbon-nitrogen components and available nutrient content. The results showed that:(1) Organic carbon (OC) content ranged from 20.95 to 82.55 g·kg-1, with significantly higher values in coniferous forests and alpine shrublands compared to meadow steppe and alpine meadows (P<0.05), and the latter two were notably higher than scree slopes (P<0.05). Warming reduced surface-layer (0-10 cm) OC to 14.64-69.13 g·kg-1P<0.05).(2) Total nitrogen (TN) content was 2.3-9.67 g·kg-1, significantly lower in scree slopes than other elevations (P<0.05), with no warming-induced variation.(3) Phytolith content (3.8-15.25 g·kg-1) peaked in coniferous forests (P<0.05), showing no significant change after warming (3.36-15.42 g·kg-1).(4) Phytolith-occluded carbon (PhytOC) ranged from 0.03 to 0.19 g·kg-1, with no warming-induced difference (0.04-0.17 g·kg-1).(5) Warming significantly reduced available nutrients (excluding scree slopes), decreasing surface ammonium nitrogen by 20% and nitrate nitrogen by 10.9%.These findings demonstrated that altitude gradients dominated the spatial distribution of carbon-nitrogen components. Simulated warming altered carbon cycling by reducing OC and available nutrients but had no significant impact on TN, phytoliths, or PhytOC, highlighting the critical role of phytolith-stabilized carbon in maintaining soil carbon stability.

Key words: Qinghai-Tibet Plateau, Simulated warming, Soil carbon and nitrogen components, Altitude gradient

摘要: 为明确祁连山不同海拔梯度(2700~4100 m)土壤碳氮组分变化特征及模拟增温的影响,通过采集不增温与模拟增温处理的各土层土壤样品,分析碳氮组分及速效养分含量。结果表明:(1)有机碳含量为20.95~82.55 g·kg-1,针叶林与高寒灌丛显著高于草甸化草原及高寒草甸(P<0.05),后者显著高于流石滩(P<0.05)。增温使表层(0~10 cm)含量下降至14.64~69.13 g·kg-1P<0.05)。(2)总氮含量2.3~9.67 g·kg-1,流石滩显著低于其他海拔(P<0.05),增温未产生显著影响。(3)植硅体含量3.8~15.25 g·kg-1,针叶林最高(P<0.05)。增温处理后(3.36~15.42 g·kg-1)无显著变化。(4)植硅体碳含量0.03~0.19 g·kg-1,增温后0.04~0.17 g·kg-1无显著差异。(5)增温使流石滩外各海拔速效养分显著降低,表层铵态氮减少20%、硝态氮减少10.9%。研究表明:海拔梯度显著影响碳氮组分空间分布,模拟增温通过降低有机碳和速效养分改变碳循环,但对总氮、植硅体及其碳含量无显著影响。

关键词: 青藏高原, 模拟增温, 土壤碳氮组分, 海拔梯度

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