青藏高原西南部高寒荒漠草原退化对土壤细菌群落的影响

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中图分类号：S812.2 文献标识码：A 文章编号：1007-0435（2025）11-3581-12

引用格式：，等，青藏高原西南部高寒荒漠草原退化对土壤细菌群落的影响[J].草地学报，2025，33（（11）：3581—3592GUO Rong-ming，ZHAO Xin，YANG Jun-hui，et al. Effects of Degradationof Alpine Desert Steppe on Soil Bacterial Community in Southwestern of the Xizang Plateau[J]. Acta Agrestia Sinica，2O25，33（11） ：3581-3592

Effects of Degradation of Alpine Desert Steppe on Soil Bacterial Community in Southwestern of the Xizang Plateau

GUO Rong-ming1， ZHAO Xin1， YANG Jun-hui1， CHENG Fang-fangl，CHEN Xin-yan2*

（1.AnimalDiseasePreventionandControlCenterofXizangAutonomousRegion/AnimalHusbandryStationofXizangAutonomousRegion，

LhasaXizanga;2stiutefialieedeteraryizagadficluradialusbdr， Lhasa，Xizang 850009，China）

Abstract：In order to understand the impact of degradation of alpine desert steppe in the southwestern part of Qinghai-Xizang Plateau on soil bacterial communities，we compared non-degraded and degraded grassands by analyzing plant community characteristics，soil physicochemical factors，and bacterial community structure. The results demonstrated that the non-degraded grassands exhibited significantly higher plant diversity than the degraded ones. Soil nutrients （including total nitrogen and organic carbon） markedly decreased in degraded graslands，while pHand available manganese content increased，leading to reduced bacterial diversity.Moreover，bacterial co-occurrence networks in non-degraded grasslands showed greater complexity and tighter connectivity. Overall，the soil environmental factors accounted for 78% of the variation in bacterial communities， with total nitrogen and pH playing pivotal roles.Redundancy analysis （RDA） further revealed that bacterial β （204号 -diversity in non-degraded grassands was positively corelated with total nitrogen but negatively with pH， whereas an oposite pattrn emerged in degraded grasslands. These findings collectively indicate that alpine desert steppe degradation alters vegetation and soil properties，thereby restructuring bacterial communities， with soil factors（particularly total nitrogen，available manganese， pH ，available copper，and available sulfur）serving asprimarydrivers.

Key words： Tibetan Plateau; Alpine desert steppe; Degenerate; Soil bacteria; Plant community; Soil physical andchemical factors

青藏高原拥有丰富的草地资源，青藏高原高寒草地在水源涵养、气候调节、水土保持、生物多样性保护等方面发挥着重要的作用，同时也是最重要的生态安全屏障[1]。（剩余22615字）