Distribution Characteristics and Influencing Factors of Soil Microbial Biomass Nitrogen and Phosphorus in Two Grassland Types in Inner Mongolia

doi:10.11733/j.issn.1007-0435.2024.09.019

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (9): 2854-2861.DOI: 10.11733/j.issn.1007-0435.2024.09.019

Distribution Characteristics and Influencing Factors of Soil Microbial Biomass Nitrogen and Phosphorus in Two Grassland Types in Inner Mongolia

ZHOU Qing-ge, LI Shao-yu, BAI Mei, LI Ya-nan, YANG Li-shan, WANG Wen-qiong, XING Jia-qing, WU Yun-ga, ZHAO Meng-li

College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010010, China

Received:2024-01-22 Revised:2024-04-24 Published:2024-10-09

内蒙古两种草地类型土壤微生物量氮、磷分布特征及影响因素

周清格, 李邵宇, 白梅, 李雅男, 杨立山, 王文琼, 邢佳庆, 乌云嘎, 赵萌莉

内蒙古农业大学草原与资源环境学院, 内蒙古呼和浩特 010010

通讯作者: 赵萌莉,E-mail:nmgmlzh@126.com
作者简介:周清格(2000-),女,汉族,天津人,硕士研究生,主要从事草地生态学研究,E-mail:1258821967@qq.com
基金资助:
科技基础资源调查专项(2019FY102004);“增温对荒漠草原生态系统恢复的影响及其机制研究”内蒙古自治区自然科学基金项目(2020ZD03)资助

Abstract

Abstract: Inner Mongolia grassland is the most important natural barrier in the north of China，Soil microbial biomass nitrogen (MBN) and phosphorus (MBP) can reflect the potential of microorganisms to sequester soil nutrients,and it is critical to investigate the distribution characteristics and driving factors of soil microbes in different grassland types to maintain ecosystem function. In this study,the distribution characteristics of MBN and MBP in different grassland types and their relationships with climatic,biotic and abiotic factors were explored by sample plot survey and indoor analysis in two grassland types,typical and desert steppe in Inner Mongolia. The results showed that MBN and MBP of typical grassland were significantly higher than those of desert grassland;MBN of desert steppe was significantly positively correlated with annual mean precipitation (P＜0.05);MBN of typical grassland was significantly positively correlated with annual mean temperature (P＜0.05),but significantly negatively correlated with annual mean precipitation (P＜0.05). MBP was not correlated with annual mean temperature and annual mean precipitation. Structural equation modeling showed that the driving factors of MBN and MBP in both grassland types were root N and root P contents. This study deepens the knowledge of microbial nitrogen and phosphorus response to climate change and provides a theoretical basis for maintaining and protecting the nutrient cycling function of arid and semi-arid ecosystems.

Key words: Soil microbial biomass nitrogen, Soil microbial biomass phosphorus, Desert steppe, typical steppe

摘要： 内蒙古草原是我国北方重要的天然屏障，土壤微生物量氮(Soil microbial biomass nitrogen,MBN)、土壤微生物量磷(Soil microbial biomass phosphorus,MBP)可反映微生物对土壤养分的固持潜力，探究不同草地类型土壤微生物分布特征和驱动因子对维持生态系统功能具有重要意义。本研究以内蒙古典型草原和荒漠草原为对象，通过样地调查和室内分析，探讨了不同草地类型MBN和MBP分布特征及其与气候因子、生物和非生物因子的关系。结果表明，典型草原的MBN和MBP的含量显著高于荒漠草原。荒漠草原的MBN仅与年平均降水量呈显著正相关(P＜0.05)，典型草原的MBN与年均温呈显著正相关(P＜0.05)，与年均降水量呈显著负相关(P＜0.05)；典型草原与荒漠草原的MBP与年平均温、年平均降水量均不相关。结构方程模型显示，两个草地类型MBN、MBP的主要调控因子均为根N、根P含量。该研究加深了微生物氮磷对气候变化的响应的认知，为维持和保护干旱半干旱生态系统养分循环功能提供理论基础。

关键词: 土壤微生物量氮, 土壤微生物量磷, 荒漠草原, 典型草原

CLC Number:

S812.2

ZHOU Qing-ge, LI Shao-yu, BAI Mei, LI Ya-nan, YANG Li-shan, WANG Wen-qiong, XING Jia-qing, WU Yun-ga, ZHAO Meng-li. Distribution Characteristics and Influencing Factors of Soil Microbial Biomass Nitrogen and Phosphorus in Two Grassland Types in Inner Mongolia[J]. Acta Agrestia Sinica, 2024, 32(9): 2854-2861.

周清格, 李邵宇, 白梅, 李雅男, 杨立山, 王文琼, 邢佳庆, 乌云嘎, 赵萌莉. 内蒙古两种草地类型土壤微生物量氮、磷分布特征及影响因素[J]. 草地学报, 2024, 32(9): 2854-2861.

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Distribution Characteristics and Influencing Factors of Soil Microbial Biomass Nitrogen and Phosphorus in Two Grassland Types in Inner Mongolia

内蒙古两种草地类型土壤微生物量氮、磷分布特征及影响因素

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