放牧强度对短花针茅根系形态影响的研究

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中图分类号：S812.6 文献标识码：A 文章编号：1007-0435（2025）12-4015-08

引用格式：，等．放牧强度对短花针茅根系形态影响的研究[J].草地学报，2025，33（12）：4015—4022 WANG Ning-bin，QIAO Ji-rong，LI Shao-yu，et al.Effctsof Grazing Intensity on Root Morphologyof Stipa breui flora[J].Acta Agrestia Sinica，2025，33（12） ：4015-4022

Effects of Grazing Intensity on Root Morphology of Stipa breviflora

WANG Ning-bin1， QIAO Ji-rong，LI Shao-yu， ZHENG Jia-hua， ZHANG Feng， ZHANG Bin ，XU Long-chao， ZHOU Qing-ge， CHEN Xin- ⋅li ， ZHAO Meng ⋅li ， JI Xiang

（1.CollegeofisglualUeittlo;ofsInerMongoliualUesiteglaeesiteegl; 4.CollegeofEnvironmentandResources，Zhejiang A&FUniversity，Hangzhou，Zhejiang Province 3ll3oo，China）

Abstract：Plant root systems serve as a critical link between soil and aboveground components，modifying their morphology in response to grazing disturbances to optimize resource acquisition eficiency. To investigate the adaptive responses of root morphology to grazing and its influencing factors in Stipa breuiflora （a dominant species of desert steppe），this study utilized a long-term grazing experimental platform in the desert steppe of Siziwang Banner，InnerMongolia.Weexamined the effects of different grazing intensities[control（CK），light grazing（LG），moderate grazing（MG），and heavy grazing（HG）]on root biomass，total root length，average diameter，and total surface area of S ，breviflora. Results showed that compared with CK，LG and MG treatments significantly increased root biomass，total root length，and total surface area，whereas HG treatment markedly reduced these parameters.All grazing treatments significantly decreased the average root diameter. Redundancy analysis identified soil nitrate nitrogen content as a key environmental factor influencing root mor phology. This study demonstrates that moderate grazing enhances S .breviflora root growth，while overgrazing exerts inhibitory efects，providing scientific insights for sustainable management and ecological conservation in desert steppes.

Key words： Desert steppe;Grazing intensity;Dominant plants;Root morphology

植物根系是连接土壤与地上部分的关键器官，对植物固持、水分和养分吸收、适应多变环境和逆境胁迫具有重要意义[]。（剩余17676字）