Distribution,Uptake and Transport Characteristics of Populus euphratica Ions at Different Leaf Phenological Stages and Their Relationship with Soil Salinity
In order to clarify the ion distribution,absorption and transport law of Populus euphratica,To explore the physiological mechanism of P.euphratica adapting to saline environment,P.euphratica in different leaf(leaf phenological stages,leaf laying period,leaf maturation stage)was taken as the research object,the soluble salt ions in various organs were determined and the characteristics of ion absorption,transport and distribution were analyzed.Combined with the soil salt under the forest,the relationship be-tween the ion distribution of P.euphratica and soil salt was discussed.The results showed that:With the changes of leaf phenological stages,P.euphratica meets the needs of growth and development as well as the adaptation to the environment through the difference of ion absorption,transportation and distribution rules.(1)The ability of selective absorption of K+,Ca2+and Mg2+by roots increased firstly and then de-creased with the changes of leaf phenological stages,and most of them were in the rapid leaf development stage as the highest,which was just the opposite to the change trends of total salt and Na+and Cl con-tents in soil.(2)With the changes of leaf phenological stages,the transportation capacity of ions from root to trunk and juvenile branch to leaf presented the opposite trend of first decline and then rise,and most of them were in the rapid development period of leaf as the lowest.(3)Na+and K+contents in dif-ferent organs changed little during the leaf developing process but increased significantly during the leaf maturation period,in which the content of Na+in root was the highest and that of K+in leaf was the high-est.The contents of Ca2+and Mg2+in leaves and roots generally increased with the changes of leaf pheno-logical stages.(4)The correlation between organ ions and soil ions of P.euphratica in the leaf phenologi-cal stages is as follows:In the embrtonic stage,the ion content of each organ is less affected by soil salt,and the correlation between indicators is mostly insignificant;During the leaf laying period,Na+in roots positively correlated with soil ions,while K+in young branches and main stems negatively correlated with soil ions.During the rapid development of leaves,Mg2+in young branches and Na+in roots were positive-ly correlated with soil ions.The ion content of each organ was less affected by soil ions during the leaf maturation period.
Populus euphraticaion absorptionion transportleaf phenological stagessoil
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