Effects of Grazing Intensities on AMF Colonization of Stipa breviflora and their influencing factors in Desert Steppe
LIU Zhao-qi1, WANG Qi2, ZHENG Jia-hua1, ZHANG Feng1, LI Shao-yu1, YANG Li-shan1, ZHANG Bin1, QIAO Ji-rong1, ZHAO Meng-li1, XU Long-chao1, WANG Ning-bin1, ZHOU Qing-ge1, DENG Yang-zhen1, WANG Xi-yuan1, CHEN Xin-li1,3, JI Xiang1,4, WANG Zhong-wu1
Affiliations
1 College of Grassland Science, Inner Mongolia Agricultural University, Key Laboratory of Grassland Resource, Hohhot, Inner Mongolia 010019, China; 2 Ulanqab Agricultural and Animal Husbandry Ecological Resource Protection Center, Ulanqab, Inner Mongolia 012000, China; 3 Zhejiang A&F University, National Key Laboratory of Forest Food Resources Exploration and Utilization, Hangzhou, Zhejiang Province 311300, China; 4 Chifeng University, Chifeng, Inner Mongolia 024000, China
Arbuscular Mycorrhizal Fungi （AMF） play an important role in maintaining the function of grassland ecosystems. Grazing is one of the main utilization modes of grasslands， which has a profound effect on the symbiotic relationship between plants and AMF. However， the regulatory effects of grazing on the Stipa breviflora-AMF symbiosis and its driving mechanisms remain unknown. This study， conducted in the S. breviflora grassland of Inner Mongolia， examined the effects of different grazing intensities—no grazing， light grazing （LG）， moderate grazing （MG）， and heavy grazing （HG）—on the AMF colonization rate in S. breviflora roots. The results revealed a significant decline in the AMF colonization rate with increasing grazing intensity. The colonization rates were 65.89%， 59.89%， 52.89% and 41.33% under different grazing intensities， respectively. Spore density and hyphal length density decreased with increasing grazing intensity. In addition， increased grazing intensity led to longer total root length and smaller root diameter in S. breviflora， along with higher soil density and pH but lower soil organic carbon and available phosphorus. However， soil moisture and nitrate nitrogen content peaked under light grazing. Soil nitrate nitrogen and available phosphorus were identified as the primary factors influencing the reduction in AMF colonization. In conclusion， grazing negatively affects AMF colonization in desert steppes by decreasing nitrogen and phosphorus nutrient effectiveness in the soil. This study provides empirical data and theoretical insights that support the development of sustainable grazing management strategies to maintain the health and resilience of desert steppe ecosystems.
LIU Zhao-qi, WANG Qi, ZHENG Jia-hua, ZHANG Feng, LI Shao-yu, YANG Li-shan, ZHANG Bin, QIAO Ji-rong, ZHAO Meng-li, XU Long-chao, WANG Ning-bin, ZHOU Qing-ge, DENG Yang-zhen, WANG Xi-yuan, CHEN Xin-li, JI Xiang, WANG Zhong-wu.
Effects of Grazing Intensities on AMF Colonization of Stipa breviflora and their influencing factors in Desert Steppe[J].
Acta Agrestia Sinica,
2026
, 34
(2)
: 469
-477
.
DOI: 10.11733/j.issn.1007-0435.2026.02.009
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