The Influencing Mechanism Of Xeric Shrubs On Medium And Trace Elements In Alxa Desert

The "fertile island" characteristics of 7 desert shrubs(i.e.Zygophyllum xanthoxylum, Nitraria tangutorum,Reaumuria soongorica,Ammopiptanthus mongolicu,Atraphaxia bracteata,Haloxylon ammodendron,Ceratoides lateens) in Alxa were investigated.We studied at various angles,such as in different parts of each shrub,at different depths,from the horizontal and vertical directions as well as the different elements on the same shrub and different shrubs on the same element.The results revealed as follows.(1)The total Cu was accumulated in the 0-10cm soil layer of Zygophyllum xanthoxylum,the contents of other elements were as follows:under the shrub