Stoichiometric Dynamics and Homeostasis of Soil-Plant-Microbial C， N， and P in Saline-Alkali Degraded Grasslands of Northern Shanxi’s Agro-Pastoral Ecotone

doi:10.11733/j.issn.1007-0435.2025.11.017

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (11): 3654-3664.DOI: 10.11733/j.issn.1007-0435.2025.11.017

Stoichiometric Dynamics and Homeostasis of Soil-Plant-Microbial C， N， and P in Saline-Alkali Degraded Grasslands of Northern Shanxi’s Agro-Pastoral Ecotone

REN Guo-hua^1,2,3, YANG Rong-bang^1,2,3, CUI Li-yuan^1,2,3, LI Yan-ling^1,2,3, YAO Meng-meng^1,2,3

1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
2. Key Laboratory for Model Innovation in Forage Production Efficiency, Ministry of Agriculture and Rural Affairs, Taigu, Shanxi Province 030801, China;
3. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi Province 030801, China

Received:2025-04-22 Revised:2025-06-27 Published:2025-11-13

晋北农牧交错带盐碱退化草地土壤-植物-微生物碳氮磷化学计量及其内稳性特征

任国华^1,2,3, 杨镕邦^1,2,3, 崔丽媛^1,2,3, 李燕玲^1,2,3, 姚蒙蒙^1,2,3

1. 山西农业大学草业学院, 山西太谷 030801;
2. 农业农村部饲草高效生产模式创新重点实验室, 山西太谷 030801;
3. 草地生态保护与乡土草种质创新山西省重点实验室, 山西太谷 030801

通讯作者: 任国华,E-mail:rengh07@126.com
作者简介:任国华（1983-），男，汉族，黑龙江鹤岗人，副教授，主要从事退化草地生态修复研究，E-mail：rengh07@126.com
基金资助:
国家重点研发计划项目（2022YFF1302803）；山西省现代农业产业技术体系建设专项资金（2025MC-06-01）资助

Abstract

Abstract: To explore the nutrient dynamics and stability mechanisms of saline-alkali degraded grassland ecosystems in the semi-arid agro-pastoral ecotone， this study examined grasslands with light， moderate， and severe saline-alkali degradation gragients in northern Shanxi. Changes in carbon （C）， nitrogen （N）， and phosphorus （P） contents， along with their stoichiometric ratios， were assessed within the soil-plant-microbe system. Coupling relationships between system components and characteristics of stoichiometric homeostasis were also analyzed. The results revealed that with increasing salinization severity， significant declines occurred in soil N content， plant C and N concentrations （in both shoots and roots）， and microbial biomass C， N， and P （MBC， MBN， MBP）. In contrast， plant P content in both shoots and roots significantly increased. These changes resulting in reduced N∶P and C∶P ratios in soil and roots， as well as decreasing C∶P ratios in shoots， indicating that N limitation was intensified in the grasslands. The regulation of the ecological stoichiometric balance between plants and microbes was influenced by soil P availability and its ratios with C and N. Shoots exhibited stronger stoichiometric homeostasis than roots and microbes. For effective ecological restoration of semi-arid saline-alkali degraded grasslands， management should focus on mitigating key nutrient limitations through scientific fertilization and enhancing ecosystem stability by introducing nitrogen-fixing plant species.

Key words: Agro-pastoral ecotone, Saline-alkali degraded grassland, Soil nutrients, Ecological stoichiometry

摘要： 为揭示半干旱农牧交错带盐碱退化草地生态系统的养分特征与稳定机制，本研究以晋北地区轻、中、重度盐碱退化草地为对象，比较了土壤-植物-微生物系统中碳、氮、磷含量及其化学计量比的变化，并分析了各组分间的耦合关系及化学计量内稳性特征。结果表明：随着盐碱化程度加剧，土壤氮含量、植物地上部与根系碳、氮含量以及微生物生物量碳、氮、磷含量均显著降低，而植物地上部与根系磷含量显著升高；盐碱化导致土壤和植物根系的氮磷比、碳磷比及植物地上部的碳磷比显著下降，草地氮限制进一步加重。土壤磷含量及其与碳、氮的化学计量比调控了植物和微生物的生态化学计量平衡。植物地上部化学计量指标的内稳性强于根系和土壤微生物。综上，在半干旱盐碱退化草地的生态修复中，应考虑通过合理施肥缓解养分限制，并引入固氮植物以提升草地生态系统稳定性。

关键词: 农牧交错带, 盐碱退化草地, 土壤养分, 生态化学计量

CLC Number:

S812

REN Guo-hua, YANG Rong-bang, CUI Li-yuan, LI Yan-ling, YAO Meng-meng. Stoichiometric Dynamics and Homeostasis of Soil-Plant-Microbial C， N， and P in Saline-Alkali Degraded Grasslands of Northern Shanxi’s Agro-Pastoral Ecotone[J]. Acta Agrestia Sinica, 2025, 33(11): 3654-3664.

任国华, 杨镕邦, 崔丽媛, 李燕玲, 姚蒙蒙. 晋北农牧交错带盐碱退化草地土壤-植物-微生物碳氮磷化学计量及其内稳性特征[J]. 草地学报, 2025, 33(11): 3654-3664.

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Stoichiometric Dynamics and Homeostasis of Soil-Plant-Microbial C， N， and P in Saline-Alkali Degraded Grasslands of Northern Shanxi’s Agro-Pastoral Ecotone

晋北农牧交错带盐碱退化草地土壤-植物-微生物碳氮磷化学计量及其内稳性特征

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