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《Arid Land Geography》 2011-01
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Effect of solute type and mineralizations on soil moisture diffusivity

GUO Quan-en1,2,WANG Yi-quan1,MA Zhong-ming2,CHE Zong-xian2,NAN Li-li3,XU Shi-wen3,LIU Yan-dong3(1 College of Resources and Environmental,Northwest Sci-Tech University of Agricultural and Forestry,Yangling 712100,Shaanxi,China;2 Soil Fertilizer and Water-saving Institute,GAAS,Lanzhou 730070,Gansu,China;3 College of Grass and Science,Gansu Agricultural University,Lanzhou 730070,Gansu,China)  
The unsaturated soil moisture diffusivity is one of the important parametres of studying soil water and salt movement.At present,a few researches have been given more attention to the influence of soil water movement on salt transfer in water and salt complex system,but the study on the constraint relationship of salt transfer to water movement was deficient.Because soil moisture movement parameters were influenced by many factors and the process of soil formation,such as soil texture,soil structure,the content of organic matter,the process of swell and shrinkage,soil structure collapse and pore blocking,ion dissociation and exchange,soil atmosphere blocking and so on.it was also influenced by ions composition and concentration of soil solution,especially in salinized soil and irrigation soil with salt water,the influence of water quality on soil water movement parameters was more important.The object of study was orchard calcareous soils in Qin'an County of Gansu Province,the influence of three kinds sodic salinity(NaCl,Na2SO4,Na2CO3) of the different mineralizations(1 g/L,3 g/L,5 g/L,10 g/L) on soil moisture diffusivity were studied by the method of horizontal soil column infiltration.The results showed that the velocity of salt and water movement was not in-phase in water-salt system,salt type was involved in the mostly influence factors in the same time.NaCl accelerated the velocity of soil water movement,but it suppressed that of soil water diffusivity;and both Na2SO4 and Na2CO3 suppressed the velocity of soil water movement and soil water diffusivity.The influence of salt solution on soil basement membrance properties was greater than the properties of transport liquid,the influence of NaCl and Na2SO4 on soil basement membrance properties and transporting liquid properties were more obvious than Na2CO3.
【Fund】: 甘肃省自然科学研究基金项目(0803KJZA040);; 甘肃省国际合作项目(090WCGA902)资助
【CateGory Index】: S152.7
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