高原鼢鼠牧食洞道干扰对高寒草地生态系统植物碳库密度的影响  

Effect of foraging tunnel disturbances created by plateau zokor on plant carbon pool density in different types of alpine grassland ecosystems

作　　者：杨欢 金玉洁 段媛媛 李捷 庞晓攀 郭正刚[1] YANG Huan;JIN Yujie;DUAN Yuanyuan;LI Jie;PANG Xiaopan;GUO Zhenggang(State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China)

机构地区：[1]兰州大学草地农业科技学院,草种创新与草地农业生态系统全国重点实验室,兰州730020

出　　处：《生态学报》2025年第5期2424-2435,共12页Acta Ecologica Sinica

基　　金：国家重点研发计划(2023YFF1304302);国家自然科学基金(42307418);兰州大学学生创新创业行动计划项目(20230010026)。

摘　　要：植物碳库是草地土壤碳库的重要来源,在草地碳循环和气候调节方面均具有重要作用。小型地下草食哺乳动物作为草地生态系统中的主要生物干扰因子之一,通过其广泛的觅食活动对植物碳库产生显著影响。选取青藏高原特有的小型地下草食哺乳动物高原鼢鼠(Eospalax baileyi)主要栖息地类型:高寒草甸、高寒草原和高寒草甸草原为研究对象,通过原位配对取样,分析牧食洞道干扰对植物碳库以及组分的影响,并筛选出牧食洞道干扰前后影响植物碳库的关键因子。研究结果表明,牧食洞道干扰显著降低了植物地上和地下碳库,降低程度从大到小依次为高寒草原、高寒草甸草原和高寒草甸。高寒草地生态系统地下和地上植物碳库比值均降低,表明地下植物碳库受到的影响相对更大。土壤含水量、微生物量碳、有机碳等因素是影响植物碳库变化的关键因子。研究强调在评估高寒草地生态系统碳库时需考虑小型地下草食哺乳动物的影响,为未来高寒草地植物碳库的管理和恢复提供了科学依据和实践方法。The plant carbon pool,an important source of the grassland soil carbon pool,plays a crucial role in carbon cycling and climate regulation.Small subterranean herbivores,such as the plateau zokor(Eospalax baileyi),significantly influence the plant carbon pool through their extensive foraging activities in grassland ecosystems.This study focuses on the plateau zokor,an endemic subterranean herbivore of the Qinghai⁃Tibet Plateau,which inhabits various types of alpine grasslands:alpine meadows,alpine steppes,and alpine meadow steppes.Using in⁃situ paired sampling,we analyzed the effects of foraging tunnel disturbances on the plant carbon pool and identified key factors influencing the plant carbon pool in both tunnel and non⁃tunnel quadrats.Our results indicate that foraging tunnel disturbances significantly reduce both the aboveground and belowground plant carbon pools,with the pronounced impact in alpine steppes,followed by alpine meadow steppes and alpine meadows.The ratio of belowground to aboveground plant carbon pools also declined across the three alpine grassland types,indicating a greater impact on belowground pools.Key factors such as soil moisture,microbial biomass carbon,and organic carbon levels were crucial in influencing the plant carbon pool changes.These findings suggest the importance of considering the impacts of small subterranean herbivores when assessing carbon pools in alpine grassland ecosystems and provide a scientific basis and practical methods for future management and restoration of plant carbon pools.

关 键 词：高寒草地 牧食洞道 高原鼢鼠 植物碳库 随机森林 

分 类 号：S81[农业科学—畜牧学]