草地学报2026，Vol.34Issue(2)：469-477,9.DOI:10.11733/j.issn.1007-0435.2026.02.009
不同放牧强度下荒漠草原短花针茅丛枝菌根真菌侵染特征及其影响因素
Effects of Grazing Intensities on AMF Colonization of Stipa breviflora and their influencing factors in Desert Steppe
摘要
Abstract
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 sym-biotic 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 grass-land 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 coloni-zation 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 graz-ing intensity led to longer total root length and smaller root diameter in S.breviflora,along with higher soil den-sity 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 coloniza-tion in desert steppes by decreasing nitrogen and phosphorus nutrient effectiveness in the soil.This study pro-vides empirical data and theoretical insights that support the development of sustainable grazing management strategies to maintain the health and resilience of desert steppe ecosystems.关键词
荒漠草原/放牧/短花针茅/菌根侵染率Key words
Desert steppe/Grazing/Stipa breviflora/Mycorrhizal infection rate分类
农业科技引用本文复制引用
刘昭岐,徐龙超,王宁斌,周清格,邓扬臻,王锡湲,陈信力,季祥,王忠武,王琪,郑佳华,张峰,李邵宇,杨立山,张彬,乔荠瑢,赵萌莉..不同放牧强度下荒漠草原短花针茅丛枝菌根真菌侵染特征及其影响因素[J].草地学报,2026,34(2):469-477,9.基金项目
国家重点研发计划(2024YFF1309000) （2024YFF1309000）
国家重点研发计划(2023YFF1304104)资助 （2023YFF1304104）
