对青海共和高寒沙地植被恢复区不同林龄（6年、11年、16年和21年）乌柳（Salix cheilophila）人工防护林根系分布及根量进行了调查、测定，同时测定了土壤有机质含量的垂向变化。结果表明：①不同林龄乌柳林根系主要由中根和细根构成，其数目占土壤剖面根系总数的90%以上，其中又以直径小于2.0 mm细根所占比例最高，细根占剖面根系总数的50%以上；②各林龄乌柳根系在0~50 cm土层分布较为集中，在30 cm以下土层，根量随深度的增加逐渐减少，6年生乌柳林根系垂直分布在0~130 cm，20年生乌柳可达200 cm，随植被恢复时间的增长，各林龄根量显著增加（p<0.05）；③各林龄乌柳林有明显发达的垂直主根，属典型的垂直状根系，随植株不断生长，根系表现出深根性；④以不同深度根系重量作为解释变量，以土壤有机质含量作为响应变量，回归结果显示不同林龄乌柳林根系重量显著影响土壤有机质含量（p<0.001），这也为评价沙地植被改良土壤功能提供了依据。
Root distribution and biomass of planted Salix cheilophila were measured based on different plantation ages (6, 11, 16 years and 21 years) in High-Cold sand land. Soil organic matters in the soil profile were also measured. Variance analysis, multi-comparison, regression analysis was used to analyze experimental results. The result indicated that: (1) The root system of Salix cheilophila on different plantation ages is mainly make up of fine roots and middle roots. Fine roots (diameter<2.0 mm) take more than 50% of the total amount. (2) The root system of Salix cheilophila mainly exists in soil depth of 0~50 cm and the weight of roots decreased below 30 cm with the soil depth. The root systems of 6-year old trees were distributed in 0~130 cm and the vertical distribution of 21-year old trees could reached 200 cm, respectively. Root biomass increased significantly with the lasting of recovery time. (3) The root system showed main roots with the extension of restoration time, Salix cheilophila of different stand ages have typical vertical root system and the taproots expanded vertically and developed obviously. (4) Regression results showed that the weight of the root has significantly effect on the soil organic matters which provide the basis to evaluated the soil improvement after the establishment of artificial Salix cheilophila plantation in the vegetation restoration area.
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