The Content and Driving Factors of Soil Microbial Necromass Carbon in Temperate Grasslands of Northern China

doi:10.11733/j.issn.1007-0435.2026.02.019

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (2): 573-580.DOI: 10.11733/j.issn.1007-0435.2026.02.019

The Content and Driving Factors of Soil Microbial Necromass Carbon in Temperate Grasslands of Northern China

WANG Xi-yuan¹, LI Shao-yu¹, WANG-Qi², DENG Yang-zhen¹, ZHANG Feng¹, ZHANG Bin¹, ZHAO Meng-li¹, CHEN Xin-li^1,3, HAN Guo-dong¹

1. College of Grassland Science, Inner Mongolia Agricultural University, Key Laboratory of Grassland Resources, Ministry of Education of China, Hohhot, Inner Mongolia 010019, China;
2. Ulanqab Agricultural and Animal Husbandry Ecological Resources Conservation Center, Ulanqab, Inner Mongolia 012001, China;
3. Zhejiang A& F University, National Key Laboratory of Forest Food Resources Exploration and Utilization, Hangzhou, Zhejiang Province 311300, China

Received:2025-03-17 Revised:2025-06-24 Published:2026-01-22

中国北方温带草原土壤微生物残体碳含量及驱动因素

王锡湲¹, 李邵宇¹, 王琪², 邓扬臻¹, 张峰¹, 张彬¹, 赵萌莉¹, 陈信力^1,3, 韩国栋¹

1. 内蒙古农业大学草业学院草地资源教育部重点实验室, 内蒙古呼和浩特 010019;
2. 乌兰察布市农牧业生态资源保护中心, 内蒙古乌兰察布 012000;
3. 浙江农林大学森林食物资源挖掘与利用全国重点实验室, 浙江杭州 311300

通讯作者: 韩国栋，E-mail:nmghanguodong@163.com
作者简介:王锡湲（2001-），女，汉族，内蒙古乌海人，硕士研究生，主要从事草地生态研究，E-mail:15694736166@163.com；
基金资助:
内蒙古自治区自然科学基金（2023MS03042）；内蒙古自治区高等学校青年科技英才支持项目（NJYT24050）；国家自然科学基金重大项目（32192463）；国家重点研发计划（2024YFF1309000）资助

Abstract

Abstract: Microbial necromass carbon （MNC） constitutes a significant component of soil organic carbon （SOC） and plays a vital role in maintaining and enhancing carbon sequestration capacity of grassland ecosystems. The temperate grasslands of northern China represent a crucial component of global grassland ecosystems， but systematic understanding of their microbial necromass carbon content and its driving factors remains limited. To address this gap， this study established transects along a natural rainfall gradient from east to west in Inner Mongolia， covering three grassland types： meadow grassland， typical grassland， and desert grassland. Soil amino sugar content was measured using the biomarker method. By integrating climate and soil characteristics， the study systematically analyzed the distribution of soil microbial necromass carbon and its driving factors. Results indicate that the average microbial necromass carbon content in topsoil is 10.65 g·kg^-1， comprising 4.79 g·kg^-1 bacterial necromass carbon and 14.80 g·kg^-1 fungal necromass carbon. Structural equation modeling reveals that microbial necromass carbon is primarily regulated by annual mean temperature， dissolved organic carbon， and pH. These findings deepen our understanding of the distribution patterns and driving mechanisms of microbial necromass carbon in northern China's temperate grasslands， providing scientific support for regional grassland carbon management and enhancing soil carbon sequestration potential.

Key words: Temperate grasslands of northern China, Microbial necromass carbon, Bacterial necromass carbon, Fungal necromass carbon, Driving factors

摘要： 微生物残体碳是土壤有机碳的重要组成，对维持和提升草地生态系统碳汇功能具有重要意义。中国北方温带草原是全球草地生态系统中的重要组成，目前对其微生物残体碳含量及驱动因素仍缺乏系统认知。为此，本研究在内蒙古地区沿自然降雨梯度自东向西设置样带，涵盖草甸草原、典型草原、荒漠草原三种草地类型，采用生物标志物法测定土壤氨基糖含量，结合气候和土壤特性，系统分析土壤微生物残体碳的分布及其驱动因素。结果表明，表层土壤微生物残体碳的含量平均值为10.65 g·kg^-1，细菌残体碳为4.79 g·kg^-1，真菌残体碳为14.80 g·kg^-1，真菌残体碳所占土壤有机碳比例大于细菌。结构方程模型分析表明，微生物残体碳主要受到年平均温度、可溶性有机碳和pH的调控。本研究结果深化了对中国北方温带草原中微生物残体碳分布格局及驱动机制的理解，为区域草地碳管理与土壤固碳潜力提升提供科学支撑。

关键词: 中国北方温带草原, 微生物残体碳, 细菌残体碳, 真菌残体碳, 驱动因素

WANG Xi-yuan, LI Shao-yu, WANG-Qi, DENG Yang-zhen, ZHANG Feng, ZHANG Bin, ZHAO Meng-li, CHEN Xin-li, HAN Guo-dong. The Content and Driving Factors of Soil Microbial Necromass Carbon in Temperate Grasslands of Northern China[J]. Acta Agrestia Sinica, 2026, 34(2): 573-580.

王锡湲, 李邵宇, 王琪, 邓扬臻, 张峰, 张彬, 赵萌莉, 陈信力, 韩国栋. 中国北方温带草原土壤微生物残体碳含量及驱动因素[J]. 草地学报, 2026, 34(2): 573-580.

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The Content and Driving Factors of Soil Microbial Necromass Carbon in Temperate Grasslands of Northern China

中国北方温带草原土壤微生物残体碳含量及驱动因素

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