Response of annual ring width of Tamarix spp. to groundwater depth in the hinterland of the Taklimakan Desert
[Objective]Tamarix spp.is a typical species in the arid desert ecosystem,which is important to study the response of Tamarix spp.to groundwater for its protection.[Methods]Based on the data of groundwater depth in the Daliyaboyi oasis at the hinterland of the Taklimakan Desert,this study analyzed the variation of tree-ring width of Tamarix spp.and discussed the relationship between tree-ring width and groundwater depth.[Results]The groundwater depth of the first sample site was increased year by year,ranging from 1.2-2.6 m.Tree-ring width of T.spp.was increased significantly from 2001 to 2020 with a range of 0.98-5.80 mm at the first sample site,and the interannual difference of tree-ring width was significant.The range of the groundwater depth of the second sample site was 2.7-4.5 m,which was in-creased first and then decreased with time.The tree-ring width of T.spp.at the second sample site changed as a sine function from 1977 to 2020,ranging from 1.46 mm to 4.41 mm,with no significant in-terannual difference.The standard chronological amplitude of T.spp.was ranging from 0.502 to 1.641 at the first sample site,which was larger than the second site that was ranging from 0.577 to 1.331.[Conclusion]A moderate increase in groundwater depth was beneficial to T.spp.growth at the first sam-ple site,supported by the increase of tree-ring width.There was no significant correlation between tree-ring width and groundwater depth at the second sample site.These results are helpful to understand the radial growth of T.spp.with the changes in groundwater depth.
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