Li, Peng

Wu, Xinhong

Yang, Tingting

Yao, Guozheng

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Study on Wind‐Sand Defending Mechanism of Single Shrub Tingting Yang Chinese Academy of Agricultural Sciences, China Xinhong Wu Chinese Academy of Agricultural Sciences, China Guozheng Yao Inner Mongolia Institute of Land Resources Information, China Peng Li Chinese Academy of Agricultural Sciences, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/6-1/43 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]765　 瞯Grasslands/Rangelands Resources and Ecology ——— Reclamation of Grasslands/RangelandsStudy on wind‐sand defending mechanism of single shrubY ang T ingting1 , W u X inhong1 , Y ao Guoz heng2 , L i Peng11 G rassland Research Institute o f Chinese A cademy A gricultural Sciences , No .120 ,W ulanchabu Road , Hohhot , 010010 ,China , E‐mail :y tt198＠ 126 .com , 2 Inner Mongolia Institute o f L and Resources In f ormation , Hohhot , 010020Key words : single shrub , wind velocity , sand‐transporting quantity , mechanism , wind‐sand flowIntroduction Sand‐fixing grass belt is an important part of Wind Erosion Protective System (Dong Zhi , ２００４ ) . By studying thewind velocity and sand‐transporting quantity around single shrub in this area , wind‐sand defending mechanism was analyzed inorder to provide a theoretical foundation for the building of sand‐fixing grass belt .Materials and methods In the sand‐fixing grass belt , using PC‐２F multichannel Anemometer and Sand Collectors , wind velocityand sand‐transporting quantity around single shrub were observed . The Observation height was decided based on the height ofshrub . The wind velocity recording time was one time for one minute , ６０ minutes for one experiment . At the same time , sand(０ ～ ２０cm from ground) was collected every ３ minutes . Then sand was weighed by １ /１０００g electron balance , and the sand‐transporting quantity was calculated .Results On the windward side of the shrub , airflow was blocked and wind speed declined , when arriving the top and the side ofshrub , it accelerated . On the leeward side , wind velocity was declined on different degree , away from shrub , wind velocitystart increase and renew to original velocity . For the shrub with closed structure , wind velocity declined quickly and renewquickly . For porous structure , wind velocity declined most and renew slow ly . For ventilation structure , wind velocity declinedleast ( Figure １) . In addition , on the leeward side , Sand transporting quantity is the least , while , on the other two sides , it isthe most , which is the same with the change of wind velocity . Therefore , on the windward and leeward side , sand wasaccumulated , but on the other two sides , there is a wind erosion area . However , wind direction usually changed with season ,which will result in sand sediment around every side of the shrub and form the shrub‐sand pile ( Figure ２) .Figure 1 w ind velocity around the shrub .　 　 　 　 　 　 　 Figure 2 Sand transporting Quantity around the shrub .Conclusions Shrub , higher than ground , is a holdback of airflow movement , when the airflow go though it , velocity willdeclined on the windward and leeward side , which is the main factor of wind‐sand flow cumulating , and is also the mechanismof sand fixing of shrub . Based on the above experiment , shrub with porous structure has the best wind‐sand defending effect .ReferenceDong Zhi , ２００４ . Research on Farmland Wind‐Sand Disaster of Oasis and its Control Mechanism in Ulan Buh Desert , Chinesedegree paper data .--windward----~ 20 .~ 20 " '" :,er Oil lo " E 0 ~ 10 " g 5 ""' " f)i 0 windward windward 2H 1H ----leeward----------------side lH --+--9. lm/s ---- g. 45m/ s --+-- 8. rnm/s ---- 8.15m/s leeward 1H 

Study on Wind‐Sand Defending Mechanism of Single Shrub

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Study on Wind‐Sand Defending Mechanism of Single Shrub

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