Cui, Xiangxin

Gao, Yong

Zhang, Xingyuan

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress The Effect of Hay Covered on Soil Evaporation Xiangxin Cui Inner Mongolia Agricultural University, China Yong Gao Inner Mongolia Agricultural University, China Xingyuan Zhang 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/21/1-4/25 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 ]174　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsThe effect of hay covered on soil evaporationCui X iangx in , Gao Yong , Zhang X ingyuanCollege o f Ecol . and Env . Sci , Inner Mongolia A gric . Univ . , Hohhot 010019 .E‐mail : gaoyong３１５ ＠ yahoo .com .cn( supported by program :2006BA D26B0102)Key words :hay , biological resources , accumulative evaporation , soil moisture , different coverage rateIntroduction In recent years , much work has been done about covered effect and mechanism in preserving soil moisture bydomestic and foreign experts ( Qiao Hailong , ２００６) . However , there are few researches on the quantitative observation on theinhibitory effect of soil evaporation .Grass hay production system is an important biological resource . With hay as test material ,this paper studied on the effect of soil evaporation by different coverage of hay and explored the mechanism .With a view torestoring grassland ecological environment and providing a theoretical basis and technological support for desertification control .Materials and methods The test material was typical sandy soil taken from Xilamuren grassland . The soil was air‐dried andhandled through ２ mm sieve , then stuffed the uniform soil into the flowerpots with diameter ２８ cm , high ３４ cm . Eachflowerpot weight ７ .３５ kg , A total of five treatments were planned , and the coverage rates were ０ , ２５％ , ５０％ , ７５％ and１００％ . Each treatment contained five replications . The flowerpots were displayed randomly with interval space of ０ .５ m , andthe water was added into flowerpots until saturated . In order to simulate natural conditions , ２０ g sandy soil was spreaded onthe surface of hay , and a preservation membrane was covered for ２４ hours . Soil evaporation was measured with Electronic Scaleof precision ０ .５ g . The observation for every two hours is needed in the first ７２ hours time , af ter that at ９ :００ am every day .Results as table showed , in the evaporation process , the cumulative evaporation of bare soil was the largest . With coverageincreasing , the amount of cumulative evaporation reduced gradually . In the first four days ( ９６ hours ) , the accumulatedevaporation of different treatments showed significantly that １００％ coverage had a great inhibition on soil evaporation , and theinhibition rate can reach ４８％ . With the increase of time , the difference between the groups became exiguous . Multiple testresults showed that during this period of the ５th to ８th day , the accumulative evaporation of ０ ,２５％ and ５０％ differed slightly .While the difference of accumulated evaporation of ７５％ and １００％ was significant , and the inhibition rates were ９ .３％ and４畅８％ . This is because after a long procession of evaporation topsoil moisture decreased gradually . As a result , the intensity ofevaporation reduced .Table 1 The accumulated evaporation o f di f f erent treatments .coverage rate ( ％ ) accumulative evaporation( g )１d ２d ３d ４d ５d ６d ７d ８d０ J３６１a ５７２a ６６４a ７３７a ７５０a ７８３a ８０７a ８２１a２５ a３３１b ５２０b ６３９b ７２２b ７４１b ７７５a ８００a ８１３a５０ a２９９c ４６０c ５８８c ７１３c ７４０b ７８１b ８０７a ８１９a７５ a２３９d ３８５d ５１４d ６３５d ６６２c ７０１c ７２８b ７４５b１００ x１９１e ３０６e ４１７e ６１８e ６７７d ７２９d ７６２c ７８２cNote : different letters in same row mean significantly under ０ .０５ level .Conclusions Different degrees of coverage can inhibit soil evaporation effectively . １００％ coverage had a greatest inhibition on soilevaporation , and the inhibition rate reached ４８ percent . With coverage increasing , the amount of accumulative evaporationreduced gradually .ReferenceQiao Ha‐Long . (２００６) . Effects of straw deep mulching on soil moisture infiltration and evaporation .[ J] Science o f Soil andW ater Conservation , ２００６ , ４(２) :３４‐３８ .

The Effect of Hay Covered on Soil Evaporation

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The Effect of Hay Covered on Soil Evaporation

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