Chen, Chengming

Hong, Mei

Wu, Ligeng

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress The Characteristic of Mg Alkali Soil Developed in Tu Mo Chuan Plain Mei Hong Inner Mongolia Agricultural University, China Ligeng Wu Inner Mongolia Agricultural University, China Chengming Chen Inner Mongolia Agricultural University, 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/21/6-2/7 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 ]779　 瞯Grasslands/Rangelands Resources and Ecology ——— Reclamation of Grasslands/RangelandsThe characteristic of Mg Alkali soil developed in Tu Mo Chuan PlainHONG Mei , WU L i‐geng , CHEN Cheng‐mingInner Mongolia A gricultural University ,H uhhot 010018 ,China .E‐mail :nmhm1970＠ sina .comKeywords :magnesium soloneiz ation ,soda saliniz ation , alkali soildevelopment stage , Tu Mo Chuan Plain , cation exchangeconsequent successionIntroduction Tu Mo Chuan Plain is one of the saline soil areas in Inner Mongolia . With the area enlarged continuously byunreasonable irrigation saline soil ,the sodic solonetz摧s formation , occurrence and distribution has been systematicly researchedby the predecessors ( Yu Renpei ,１９６４ ;Hao Zhenxiang ,１９９３) ,but the issues of magnesium soil have not been published .Materials and methods Three profile are selected . Profile １ is located in DaHeiHe cattle farm . The parent material is alluvialdeposit . It belongs to the type of salic profile . The plant cover is of the type of halophytic meadow .Profile ２ is located ５００msouth of San Qingying village in Tuo Ke Tuo . Profile ３ is located in the southeast of Genbao Village of Ba Bai Xiang about５００m .It belongs to the type of desalting prohile . The plant cover is the type of steppe . Research methods :(１) determination ofExchangeable base Salt‐leaching : First , Salt‐leaching : weigh the particle of desiccated soil ５ .００００g ( ＜ ０ .２５mm) ,then use ８５％ethanol for centrifugation washing once , and then use ９５％ ethanol to wash by several times until there is no Cl‐ . Second ,extract : wash water‐soluble salt , then use １N NH４ OAc of pH９ .３ . Extract Ca and Mg with EDTA complexing titrimetricmethod ;Measure K and Na with flamc photometry .( ６４００A ) ( ２ ) The measure of soluble salt :make the soil : water of １ :１ .Titrate CO３ ２‐ 、HCO３ － with double indicator ;Titrate Cl‐ with AgNO３ ;Titrate SO４ ２‐ with EDTA complexing titrimetric ;TitrateK ＋ 、Na ＋ with flamc photometry ;Titrate Ca２ ＋ 、Mg２ ＋ with EDTA complexing titrimetric .( ３ ) Determination of the pH with theacidimeter .( PHS‐３D) .Results From the Profile１ ,it shows that the soluble salt aggregates in the epipedon and the subsurface horizon .In the epipedon ,Na＋ takes more than ９５％ of the whole soluble salt . The content of Mg is the highest in the subsoil and the content of Ca is thehighest in the substratum . pH is very high in the epipedon . In the epipedon and subsurface horizon ,the degree of alkalization isvery high . With the depth increasing , exchangeable magnesium aggregates obviously . From the Profile２ ,it shows that thecontent of water‐soluble salt is a little in the surface ,but it increases in the subsoil and substratum .In the subsurface horizon ,sodium salt takes absolute advantage in the whole profile . The contents of exchangeable calcium and magnesium are high in theepipedon . With the depth increasing ,Na increases .From the Profile３ ,it shows that in the epipedon of the profile , the content ofMg is high . In the subsoil , Na is very much . The content of exchangeable magnesium is also very much in this profile .Thehorizon of high Na percent saturation appearce under the Mg accumulation horizon .Conclusions Magnesium alkali‐affected soil appears both in the process of salification and desalting , In the process ofsalification , sodic soloneization accompnished with magnesium soloneization . In the surface of the profile the content of Na ishigh .Mg take the advantage under the horizon of Na . In the process of desalting , The horizon of Mg aggregates upon thehorizon of Na . With gradually desalting ,Mg is instead by Ca ,then form the normal soil .ReferencesYu Renpei .Characteristic of soda‐salinized soil in Big‐Hihe and Small‐hihe [ J .] Soil Newspaper , １９６４ ,１２(２３) :１７２‐１８１ .Hao Zhenxiang . The research of suda‐saline‐sodic .[ J] . Journal o f A rid L and Resources an Env ironment , １９９３ , ７ (３‐４) :２４８‐２４９ .

The Characteristic of Mg Alkali Soil Developed in Tu Mo Chuan Plain

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The Characteristic of Mg Alkali Soil Developed in Tu Mo Chuan Plain

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