Comparative research of salt absorbency on Atriplex canescens of different types of saline soils

【objective】 The analysis of salt absorbing effect on Atyiplex canescens to six types of saline alkali soils,was studied to provide rational utilize resource of saline-sodic soil and to guide the improvements of environments of alkaline saline soils.【Method】 The experiments were conducted from Apr.to Sep.in 2008.The plant materials were one-year-old American A.canescens,been potted in 6 types of saline soil,namely soda saline moisture soils,alkalized moisture soil,saline soil,mixture saline moisture soils,sulphate saline moisture soil and chloride saline moisture soil.The improved impacts of A.canescens on these 6 types of saline soils,including salt quantity in different soils,pH,quantitative change of water in leaves and net photosynthesis ratio change in leaves were studied.【Result】 To 5 types of saline soils A.canescens had obvious difference yet remarkable effect in absorbency of diverse salt.In various development periods the absorbency of diverse salt was different.A.canescens couldn't change the pH in Alkaline moisture soil,but had significant effects on pH in other soils.There was no influence in quantitative change of water in leaves.The trends of net photosynthesis ratio change in leaves on different saline soil were the same.The maximum value of Pn in leaves appeared in the A.canescens growing on sulphate saline moisture soil,the minimum Pn in leaves in the A.canescens growing on saline soil.【Conclusion】 Best effects of A.canescens growing on soda saline moisture soil,sulphate saline moisture soil and mixture saline moisture soil were shown.The A.canescens still had some good influences on chloride saline moisture soil and saline soil,but it can not grow in alkalized moisture soil.