摘要
地下啮齿类动物挖掘活动是影响坡面土壤再分配和土壤侵蚀的因素之一,对其进行深入研究有助于理解土壤侵蚀的复杂机制。为探究黄土高原地下啮齿类动物挖掘活动的空间分布特征及对土壤侵蚀的影响,本文对位于黄土高原中部的庆阳市环县平顶山一处典型坡面(665 m^(2))进行了为期6个月的定点重复监测,采用无人机航测结合野外调查,追踪了地下啮齿类动物挖掘活动的空间分布,分析了挖掘活动对土壤性质的影响,并量化了研究坡面内挖掘活动引起的土壤侵蚀量。结果显示:(1)地下啮齿类动物采食活动和掘穴活动均偏好于分布在坡度较缓、流水分散区和凸形坡区域。(2)与未扰动土壤相比,挖掘活动产生的土丘容重降低了14%(P<0.05),孔隙度和饱和导水率均增加了11%(P<0.05)。(3)观测期内地下啮齿类动物的挖掘活动将0.13 t的土壤翻覆至地表,土壤再分配对应的坡面搬运通量约为2.18 cm^(3)/(cm·a)。如果全部转化为土壤侵蚀,其侵蚀模数约为397 t/(km^(2)·a)。上述结果表明挖掘活动是黄土高原坡面土壤再分配的重要营力之一,大约贡献了土壤侵蚀总量的10.1%,需要在今后的水土流失评估与模型计算中予以关注。
Subterranean rodent excavation activities constitute one of the factors influencing soil redistribution and erosion on hillslopes.Investigating these activities in depth contributes to a better understanding of the complex mechanisms of soil erosion.To explore the spatial distribution characteristics of subterranean rodent excavation activities and their impact on soil erosion in the Loess Plateau,this study conducted six months of fixed-point repeated monitoring on a typical hillslope(665 m2)in Pingdingshan,Huanxian county,located in the central part of the Loess Plateau.Utilizing unmanned aerial vehicle(UAV)surveying combined with field investigations,the study tracked the spatial distribution of subterranean rodent excavation activities,analyzed their effects on soil properties,and quantified the soil erosion generated by excavation activities on the study hillslope.The results indicate that:(1)Subterranean rodents exhibit a preference for feeding and burrowing activities in areas with gentle slopes,dispersed flow,and convex slope regions.(2)Excavation activities decrease the bulk density of fresh soil mounds by 14%(P<0.05)compared to undisturbed soil,while porosity and saturated hydraulic conductivity increase by 11%(P<0.05).(3)Over the observation period,subterranean rodent excavation activities overturned 0.13 t of soil onto the surface,with an associated slope transport flux of approximately 2.18 cm3/(cm·a).If all these fluxes were converted into soil erosion,the erosion modulus would be approximately 397 t/(km2·a).These results highlight the significant role of excavation activities in soil redistribution on hillslopes of the Loess Plateau,contributing to approximately 10.1%of the total soil erosion,which warrants attention in future assessments and modeling of soil erosion and loss.
作者
白晓亮
耿豪鹏
刘茹
程维明
潘保田
BAI Xiaoliang;GENG Haopeng;LIU Ru;CHENG Weiming;PAN Baotian(College of Earth and Environmental Science,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Western China's Environmental Systems,Ministry of Education,Lanzhou 730000,China;State Key Laboratory of Geographic Information Science and Technology,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China)
出处
《地理学报》
北大核心
2025年第5期1327-1338,共12页
Acta Geographica Sinica
基金
国家自然科学基金项目(42322101,42130110)。
关键词
地下啮齿类动物
挖掘活动
土壤侵蚀
黄土高原
subterranean rodents
excavation activities
soil erosion
Loess Plateau
