Geng, Liying

Nan, Zhibiao

Niu, Yining

Shen, Yuying

Yang, Jing

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Conservation Tillage Influence on Topsoil Aggregation and Carbon Content on the Loess Plateau, China Jing Yang Lanzhou University, China Yuying Shen Lanzhou University, China Zhibiao Nan Lanzhou University, China Yining Niu Lanzhou University, China Liying Geng Lanzhou 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/21/2-3/11 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. 瞯 ]406　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Soil Quality and Plant NutritionConservation tillage influence on topsoil aggregation and carbon content on the Loess Plateau ,ChinaJing Y ang , Y uy ing Shen 倡 ,Zhibiao Nan , Y ining N iu , L iying GengCollege o f Pastoral A griculture Science and Technology , L anz hou University ７３００２０ China ; E‐mail : j yang２００６ ＠ lz u .cnKey words : soil property ,organic carbon ,no‐till ,stubble retention ,sustainabilityIntroduction In the Loess Plateau , the deterioration of the environment and in particular soil erosion are severe . In addition tofrequent droughts in the area , soil is characterized as both having poor structural stability and as being infertile . Conservationtillage is believed to have beneficial effects on agricultural production , the environment and the economy . This paper reports thefindings of a study which investigated the soil aggregation stability , total carbon , organic carbon and inorganic carbon underdifferent tillage methods , in doing so it has aimed to confirm which tillage method and soil management program is most suitedto the Loess Plateau .Materials and methods This long term conservation tillage experiment was carried out in the western Loess plateau ( ３５°４０′N ,１０７°５１′E ) . Long‐term average rainfall was ５６２ mm . T reatments were conventional tillage ( T ) , conventional tillage withstubble retention ( TS) , no‐till ( NT ) and no till with stubble retention ( NTS) . A completed randomized block design with fourreplications was used . The soil samples were collected af ter wheat harvest and analyzed for the proportion of water‐stableaggregates ( ＞ ０ .２５mm) by wet sieving method . Total carbon ( TC ) , total organic carbon ( TOC) and total inorganic carbon( TIC) were measured by use of the combustion method with liquiTOC ( elementar , Germany) .Results In the ０‐２ .５ , ２ .５‐５cm layers , the highest water stable aggregate ( ＞ ０ .２５mm) , organic carbon and total carbon contentfor were measured under NTS treatment , however for the ５‐１０cm layer these measurements were highest under the TStreatment . Stubble retention with no‐till had a significant effect on increasing the content of water‐stable aggregates ,OC andTC content for ０‐５ cm depth , compared with those under the T treatment . No‐till increased the organic carbon proportionwithin the total carbon pool significantly . There was a significant positive correlation between aggregate and OC content for topsoil ( P ＜ ０ .０１) ( see table) .Table 1 Water stable aggregates p roportion and Carbon content under di f f erent tillage treatments a f ter seven yearsimp lementation .Soil depth ( cm) treatment Water‐stable aggregate proportion( ％ ) ＞ ０  .２５mm OC( g .kg‐１ ) TC( g .kg‐１ ) OC/ TCT ３５  .５１ ６ 3.３２ １６ .９３ ０ s.３８TS ２６  .７２ ６ 3.９６ １７ .７７ ０ s.３９０‐２ ..５ NT ３５  .８５ ７ 3.７６ １７ .６８ ０ s.４４NTS ３７  .８５ ９ 3.４０ １９ .０８ ０ s.４９LSD０ 创.０５ ４ 眄.７２ １ 3.０２ １ 佑.８２９ ０ s.０７５T １９  .３ ６ 3.４０ １６ .５８ ０ s.３９TS ２２  .０３ ５ 3.８３ １７ .３０ ０ s.３５２ 後.５‐５ .０ NT ２８  .８３ ６ 3.８４ １７ .０２ ０ s.４０NTS ３２  .０３ ８ 3.４３ １８ .５６ ０ s.４６LSD０ 创.０５ ４ 眄.５１ ０ 3.９４ １ 佑.９９ ０ s.０７３T １７  .５９ ６ 3.０１ １６ .７９ ０ s.３６TS ２３  .５３ ６ 3.６４ １７ .５１ ０ s.３８５ 後.０‐１０ .０ NT ２１  .９８ ６ 3.００ １６ .６１ ０ s.３６NTS １８  .９８ ６ 3.６ .５７ １６ .９７ ０ s.３９LSD０ 创.０５ ４ 眄.９ ０ 3.８７４ １ 佑.７３９ ０ s.０７２Conclusion Conservation tillage had obvious effects on soil organic carbon improvement af ter seven years of implementation . Soilproperties under conservation tillage were both more suitable for crop grow th and long‐term soil sustainability , both of whichwill be beneficial to developing a more sustainable farming system in the Loess plateau .

Conservation Tillage Influence on Topsoil Aggregation and Carbon Content on the Loess Plateau, China

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Conservation Tillage Influence on Topsoil Aggregation and Carbon Content on the Loess Plateau, China

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