Research On Salt Movement And Biological Salt Removal Under Different Irrigation Condition

Soil salinization is one of the main ecological environmental problems of agricultural development inthe arid areas.The problem facing the increasingly severe drought, water shortage, salinization,The problemfacing the increasingly severe drought,water shortage, salinization.Has become a hot method after waterimprovement method of global improvement of saline-alkali soil utilization.In this study,observation ofFukang Desert Ecosystem Experimental Station of Chinese Academy of Sciences Based on,the method offield and indoor test combination,discussion on the salt movement and distribution characteristics of saline-alkali wasteland under different irrigation methods.Melilotus officinalis （Linn.） Pall, Triticum aestivumLinn, Medicago sativa Linn, Helianthus annuus Linn, Glycyrrhiza uralensis Fisch and other5kinds of salttolerance of plant biological salt excretion.To evaluate the biological row irrigation of farmland soil saltsalt balance problem under consideration.The main conclusions are as follows:（1）Under different irrigation methods,the total reserves of0¹m soil salinity years decreased and1²msoil accumulation.Most of the soil salt leaching into deep soil through irrigation,description of soil salinityby accumulation type to the bottom product type.Under irrigation and non-irrigation condition,soil salinitygradient difference between formation of interannual fluctuations significantly,soil salinity changes affectthe overall annual salinity variation amplitude,the change of soil salinity salinity gradient high greatly, thechange of soil salinity gradient smaller low salinity.（2）No matter what kind of irrigation method influence of surface soil salinity maximum,influenced byplant coverage,root activity,irrigation quantity and irrigation times.0⁴0cm soil desalting was the best,deepsoil total salt in a state of accumulation.（3） Different inter-annual fluctuations in soil salinity gradient difference significantly,under thecondition of irrigation and irrigation,soil salinity changes have impact on interannual variability.Highsalinity gradient of soil salinity changes is big,low salinity gradient of soil salinity changes is small.（4） Five different plants of salt size difference is remarkable,and salt removal size:Melilotus officinalis（Linn.） Pall>Helianthus annuus Linn.>Medicago sativa Linn.>Triticum aestivum Linn>Glycyrrhizauralensis Fisch.;Na+content removal size:Helianthus annuus Linn.>Melilotus officinalis （Linn.）Pall>Medicago sativa Linn.>Triticum aestivum Linn>Glycyrrhiza uralensis Fisch;salt-tolerant licorice.Dueto the difference of plant variety or the plant parts,in the plant body accumulation phenomena arereported.Plant biomass determines the size of the plant of salt,how much salt remocal is not only related todifferent plant species,plants are affected by factors such as planting density,length of growing period.（5） Five different plant soluble salt ions is remarkable significantly,excluded ability of all the plantswas in Cl-the highest,excluded ability of Ca²⁺and Mg²⁺was the weakest,plants for Cl-selective absorptionis better than other ions. Excluded ability of Canopy on Cl–was the strongest,showed high chloride contentin plant.Compared with some other plants,Helianthus annuus Linn.removaled the highest and saltaccumulation in the body of2412.04kg/hm2of soil （top layer0⁴0cm）1.4%of the total salt.（6） Each piece of experimental village plant discharge and irrigation is introduced into the differencebetween the salt each are not identical,the experimental plot A and D the difference between salt dischargeand introduce is17.52kg,7.89kg,the cumulative Salt reserves S<0,this shows that the soil is in a state ofdesalination.The salt removcal rate of Melilotus officinalis （Linn.） Pall,Helianthus annuus Linn.meetsirrigation and root zone salt balance equation,make sure that the soil is in a state of desalination.