Analysis on Sand Fxation Characterization of Clustered Haloxylon ammodendron with Different Site Conditions
Haloxylon ammodendron is the most widely distributed and largest psammophilous vegetation in Xinji-ang,with two growth forms:monocot and clustered.The sandpile formed at the base of the cluster form has a sig-nificant fixation effect on the moving dune,and the height of the sand pile at the stem base reflects its sand-fixing ability.In order to explore the sand-fixing ability of the cluster form of Haloxylon ammodendron under different site conditions and the morphological indexes affecting the sand-fixing ability of the cluster form,the present study took Haloxylon ammodendron with cluster morphology in Ganjia Lake,149 Group of Shihezi and 103 Group in Wujiaqu as the research objects.The height,branch number,total crown width,branch basal diameter and sandpile thick-ness in stem base of Haloxylon ammodendron with cluster morphology in three site conditions(windward slope,crest and interdune)were measured,and the correlation coefficient between the thickness of sand accumulation and morphological indexes of Haloxylon ammodendron with cluster morphology was calculated.The results showed that:(1)There was no significant correlation between the sand accumulation at the base of the clustered form of Haloxylon ammodendron and the site conditions,but the interdune was more conducive to the sand accumulation in the clustered form of Haloxylon ammodendron.(2)The sand dune thickness at the stem base of Haloxylon ammoden-dron was significantly correlated with the total crown width and branch basal diameter(P<0.01),with the correla-tion coefficients of 0.726 and 0.676,and with the height of Haloxylon ammodendron(P<0.05).The sand fixation ability of Haloxylon ammodendron was mainly determined by the total crown width,followed by branch base diam-eter,and finally height.
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