Threshold friction velocity influenced by soil particle size within the Columbia Plateau, northwestern United StatesOACSTPCD
Wind erosion is a geomorphic process in arid and semi-arid areas and has substantial implications for regional climate and desertification.In the Columbia Plateau of northwestern United States,the emissions from fine particles of loessial soils often contribute to the exceedance of inhalable particulate matter(PM)with an aerodynamic diameter of 10μm or less(PM10)according to the air quality standards.However,little is known about the threshold friction velocity(TFV)for particles of different sizes that comprise these soils.In this study,soil samples of two representative soil types(Warden sandy loam and Ritzville silt loam)collected from the Columbia Plateau were sieved to seven particle size fractions,and an experiment was then conducted to determine the relationship between TFV and particle size fraction.The results revealed that soil particle size significantly affected the initiation of soil movement and TFV;TFV ranged 0.304-0.844 and 0.249-0.739 m/s for different particle size fractions of Ritzville silt loam and Warden sandy loam,respectively.PM10 and total suspended particulates(TSP)emissions from a bed of 63-90μm soil particles were markedly higher for Warden sandy loam than for Ritzville silt loam.Together with the lower TFV of Warden sandy loam,dust emissions from fine particles(<100μm in diameter)of Warden sandy loam thus may be a main contributor to dust in the region''s atmosphere,since the PM10 emissions from the soil erosion surfaces and its ensuing suspension within the atmosphere constitute an essential process of soil erosion in the Columbia Plateau.Developing and implementing strategic land management practices on sandy loam soils is therefore necessary to control dust emissions in the Columbia Plateau.
MENG Ruibing;MENG Zhongju;Brenton SHARRATT;ZHANG Jianguo;CAI Jiale;CHEN Xiaoyan;
College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China Key Laboratory of Aeolian Physics and Desertification Control Engineering from Inner Mongolia Autonomous Region,Inner Mongolia Agricultural University,Hohhot 010018,China Key Laboratory of Desert Ecosystem Conservation and Restoration,State Forestry and Grassland Administration of China,Inner Mongolia Agricultural University,Hohhot 010018,ChinaUSDA-Agricultural Research Service,Washington State University,Washington 99164,USACollege of Resources and Environment,Northwest A&F University,Yangling 712100,ChinaInner Mongolia Autonomous Region Academy of Social Sciences,Hohhot 010010,China
农业科学
particle sizethreshold friction velocityinhalable particulate mattertotal suspended particlesWarden sandy loamRitzville silt loamColumbia Plateau
《Journal of Arid Land》 2024 (008)
P.1147-1162 / 16
Basic Research Funds for Colleges and Universities directly under the Inner Mongolia Autonomous Region:Desert Ecosystem Protection and Restoration Innovation Team(BR 22-13-03).
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