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

doi:10.11733/j.issn.1007-0435.2025.10.020

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

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

WANG Ze-yue¹, WANG Wen-ying^1,3, XIONG You-cai², CHEN Xiao-yue¹, WANG Yu-xing¹, MA Yan-mei¹, YANG Fang-kun¹

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. 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

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^-1 （P<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^-1 （P<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

CLC Number:

S812.2

WANG Ze-yue, WANG Wen-ying, XIONG You-cai, CHEN Xiao-yue, WANG Yu-xing, MA Yan-mei, YANG Fang-kun. Effects of Simulated Warming on Soil Carbon and Nitrogen Components Under Different Altitude Gradients in Qilian[J]. Acta Agrestia Sinica, 2025, 33(10): 3318-3329.

王泽岳, 王文颖, 熊友才, 陈晓玥, 王宇星, 马燕梅, 杨方堃. 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[J]. 草地学报, 2025, 33(10): 3318-3329.

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

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

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