Characteristics of the Soil around the Main Root of Haloxylon Ammodendron
Based on establishing meter-level spatial scale to conduct stratified sampling,the changes of moisture content,bulk density,pH,electrical conductivity and nutrient in the soil around the main roots of Haloxylon ammodendron which is the constructive species at the south edge of Junggar Basin have been studied.The results showed that:(1) The soil moisture content reached the lowest value at depth of 5 cm.The soil bulk density did not change remarkably in the 0-40 cm soil layer.However,with the increase of distance to the main root,the above two factors significantly changed (p＜0.05).(2) The soil pH and electrical conductivity respectively presented around the aggregation phenomenon in the taproot zone,the maximum aggregation rate was in 0-1 m layer.However,with the increase of distance,the soil depth gradually became the dominant factor.(3) The soil nutrients aggregated at the 5 cm layer,while in the range of horizontal aggregation,except that the organic matter and total nitrogen extended to 3-4 m,both the total P and available nutrients were located in the range of 0-2 m.These may have a theoretical significance on the rational close planting of salt tolerant vegetation in the desert area.
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