A Study On The Constituents And Distribution Of Soil Aggregates And Distribution Features Of Salt-based Ions In The Soil Aggregate During Oases

This study carried out artificial vegetation reclamation in salinated abandoned land of alluvial fan in Manasi River Basin.We investigated two experiments,1.Treatment of different restoration patterns of saline abandoned land,include four treatments: Salinated abandoned land,single cotton crop treatment,intercropping patterns and rotation farmland treatment;2.Treatment of salinization abandoned farmland with different restoration years,include four treatments:Salinated abandoned land,5 years of recovery,10 years of recovery and 15 years of recovery.Soil aggregate composition and the base cations in soil aggregates was examined.It aims to reveal the variation of soil quality and soil aggregate base cation composition on ecological reclamation in arid area.The findings from this study will assist in development and sustainable utilization of oasis salinated abandoned land in arid region.The main conclusions are as follows:(1)The content of > 0.25 mm soil aggregate(R0.25)in different recovery patterns and different recovery years increased significantly compared to the salinated abandoned land;There is no significant difference in the number of aggregates of each particle size in different recovery patterns;The effect of different recovery patterns and recovery years on the number of aggregates shows a trend of increase-decrease as soil depth increase.(2)The content of > 0.25 mm soil aggregate(R0.25)、 MWD and GMD in different recovery patterns and different recovery years increased significantly compared to salinated abandoned land;There is no significant difference in MWD and GMD between single cotton crop treatment and rotation farmland treatment,and the intercropping mode is significantly higher than that of other treatments;R0.25,MWD and GMD shows an increasing trend with the increase of recovery years.(3)D values of the Soil aggregate increased significantly compared to salinated abandoned land;There is no significant difference between single cotton crop treatment and rotation farmland treatment,D value in the intercropping mode is significantly lower than that of single cotton crop treatment and rotation farmland treatment;D value shows an increasing trend with the increase of recovery years.(4)The content of Na+ in aggregates decreased significantly when compared with abandoned farmland in different recovery models and different recovery years;and the content of Na+ treated with different modes showed: Abandoned farmland > Monoculture farmland > Intercropping model > Rotation farmland;there is a decreasing trend in the treatment of different recovery years with the increase of the recovery period,0.25-0.053 mm is the lowest in particle size and the content of Na + in the aggregates shows a decreasing trend with the increase of soil depth.(5)In different restoration modes,the content of K+ in the aggregate decreased significantly compared with the abandoned farmland,and the content of K+ in different treatments showed:Monoculture farmland > Intercropping model > Rotation farmland;the content of K+ in the aggregates of different recovery years showed a tendency to decrease first(after recovery for 5years)with the increase of the recovery period,and the highest in the < 0.053 mm particle size.(6)The content of Mg2+ in different recovery mode in monoculture in farmland than in abandoned land increased significantly,intercropping and rotation field was significantly lower than that of abandoned farmland,and the content of Mg2+ in different treatments showed:Monoculture farmland > Abandoned farmland > Rotation farmland > Intercropping model;the content of Mg2+ in the agglomerates treated with different recovery years showed a tendency to decrease(decrease after 5 years)with the increase of the recovery period;with the decrease of thesize of the aggregates,the content of Mg2+ showed an increasing trend,and the depth of soil layer showed a decreasing trend.(7)The content of Ca2+ in different recovery mode in monoculture in farmland than in abandoned land increased significantly,intercropping and rotation field was significantly lower than that of abandoned land,and the content of Ca2+ in different treatments showed: Monoculture farmland>Abandoned farmland> Intercropping model> Rotation farmland;the content of Ca2+ in the agglomerates treated with different recovery years showed a tendency to decrease(decrease after5 years)with the increase of the recovery period;the content of Ca2+ decreases with the decrease of particle size of aggregates.