Responses of Carbon and Nitrogen Allocation in Different Organs of Dominant Species to Grazing Treatment in Typical Steppe of Inner Mongolia

doi:10.11733/j.issn.1007-0435.2026.10.026

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (10): 3805-3816.DOI: 10.11733/j.issn.1007-0435.2026.10.026

Responses of Carbon and Nitrogen Allocation in Different Organs of Dominant Species to Grazing Treatment in Typical Steppe of Inner Mongolia

YAN Jia^1,2, LIU Xin-rui^1,2, WANG Zhong-wu^1,2, HE Li-ming^1,2, QU Zhi-qiang^1,2, LI Zhi-guo^1,2, ZHANG Heng³

1. College of Grassland Science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China;
2. Key Laboratory of Grassland Resources Ministry of Education P. R. of China, Hohhot, Inner Mongolia 010000, China;
3. Forestry and Grassland Bureau of Zhengxiangbai Banner, Xilingol League, Inner Mongolia Autonomous Region, Zhengxiangbai Banner, Xilingol League, Inner Mongolia 013800, China

Received:2025-12-25 Revised:2026-03-06 Published:2026-10-10

内蒙古典型草原优势植物不同器官碳氮分配对放牧的响应

闫佳^1,2, 刘欣蕊^1,2, 王忠武^1,2, 赫黎明^1,2, 屈志强^1,2, 李治国^1,2, 张恒³

1. 内蒙古农业大学草业学院, 内蒙古呼和浩特 010011;
2. 草地资源教育部重点实验室, 内蒙古呼和浩特 010011;
3. 内蒙古自治区锡林郭勒盟正镶白旗林业和草原局, 内蒙古锡林郭勒 013800

通讯作者: 王忠武, E-mail: wangzhongwu@imau.edu.cn
作者简介:闫佳（2001-），女，汉族，内蒙古呼和浩特人，硕士研究生，主要从事草地资源生态与管理研究，E-mail：yanjia158@foxmail.com
基金资助:
内蒙古科技重大专项（2024JBGS0011）；内蒙古农业大学一流学科科研专项（YLXKZX-NND-002）资助

Abstract

Abstract: In order to reveal the responses of carbon and nitrogen distribution in different organs of dominant plants in typical steppe to grazing treatments， five plant species-Stipa krylovii， Leymus chinensis， Artemisia frigida， Carex duriuscula， and Bassia prostrata-were selected as the research objects from typical steppe in Zhengxiangbai Banner， Inner Mongolia. The contents and allocation ratios of carbon and nitrogen in roots， stems， and leaves were measured and analyzed. The results showed that grazing had little effect on the proportion of carbon allocation in plant organs， but had a significant impact on the proportion of nitrogen allocation. Compared with control plots， medium grazing significantly increased the proportion of leaf nitrogen allocation of gramineous plants， and heavy grazing significantly increased the proportion of leaf nitrogen allocation of shrubs. Under medium grazing， nitrogen allocation ratios to stems increased significantly in Bassia prostrata， while it decreased significantly in Stipa krylovii， Leymus chinensis， and Artemisia frigida. However， the proportion of above-ground nitrogen allocation increased significantly. In summary， the responses of different dominant plants to grazing had significant species specificity. Medium grazing promoted the growth of above-ground parts of typical steppe plants in Inner Mongolia. Grazing affected the carbon and nitrogen allocation of plant organs by changing soil water content and soil total carbon content.

Key words: Grazing, Typical steppe, Dominant plants, Carbon and nitrogen allocation in plant organs

摘要： 为揭示典型草原优势植物不同器官中碳氮分配对放牧处理的响应情况，本试验在内蒙古正镶白旗典型草原选取克氏针茅（Stipa krylovii）、羊草（Leymus chinensis）、冷蒿（Artemisia frigida）、寸草苔（Carex duriuscula）、木地肤（Bassia prostrata）共５种植物为研究对象，测定并分析根系、茎秆、叶片三部分碳、氮含量及分配比例。研究结果表明，放牧对植物各器官碳分配比例影响较小，对氮分配比例影响较大。与不放牧处理相比，中度放牧会显著增加禾本科植物的叶片氮分配比例，重度放牧会显著增加灌木的叶片氮分配比例，中度放牧下木地肤茎秆氮分配比例显著增加，克氏针茅、羊草和冷蒿茎秆氮分配比例显著降低，但地上部分的氮分配比例均显著增加。综上，不同优势植物对放牧的响应存在显著的物种特异性，中度放牧有利于内蒙古典型草原植物地上部分的生长，放牧通过改变土壤含水量和土壤全碳含量影响植物各器官的碳氮分配。

关键词: 放牧, 典型草原, 优势植物, 植物器官碳氮分配

CLC Number:

S812

YAN Jia, LIU Xin-rui, WANG Zhong-wu, HE Li-ming, QU Zhi-qiang, LI Zhi-guo, ZHANG Heng. Responses of Carbon and Nitrogen Allocation in Different Organs of Dominant Species to Grazing Treatment in Typical Steppe of Inner Mongolia[J]. Acta Agrestia Sinica, 2026, 34(10): 3805-3816.

闫佳, 刘欣蕊, 王忠武, 赫黎明, 屈志强, 李治国, 张恒. 内蒙古典型草原优势植物不同器官碳氮分配对放牧的响应[J]. 草地学报, 2026, 34(10): 3805-3816.

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Responses of Carbon and Nitrogen Allocation in Different Organs of Dominant Species to Grazing Treatment in Typical Steppe of Inner Mongolia

内蒙古典型草原优势植物不同器官碳氮分配对放牧的响应

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