[目的] 研究砒砂岩区土壤含水量对沙棘液流速率及细根变化的响应，为沙棘在砒砂岩等干旱缺水地区的合理栽培和经营提供参考。[方法] 利用Granier茎干液流测定系统，对砒砂岩地区鄂尔多斯市准格尔旗暖水乡沙棘（Hippophae rhamnoides）人工林的茎干液流进行长期监测，并同时对植物的细根及细根周围的土壤水分进行测定，运用相关性分析法分析沙棘人工林在生长季（6—10月）的茎干液流日变化规律及植物细根对土壤水分变化的响应。[结果] ①土壤含水量与沙棘液流速率呈现出在前期（6—7月）较低，中后期（7—9月）不断升高，后期（9—10月）有迅速下降的变化趋势。而沙棘细根的生长速率也呈现出中后期较高，前期和后期较低的变化趋势。②比较生长季各月份土壤含水量和沙棘液流速率的变化趋势趋于一致，从大到小排列依次为：8月>7月>9月>6月>10月。③土壤含水量变化与沙棘液流速率变化呈极显著正相关关系（p<0.01），随着土壤含水量增大，沙棘液流速率逐渐升高；沙棘细根生长速率与沙棘液流速率呈显著正相关关系（p<0.05），沙棘细根生长速度越快，沙棘液流速率越大；反之，沙棘细根生长速度越慢，沙棘液流速率越低。土壤含水量变化与细根生长速率呈极显著正相关关系（p<0.01），随着土壤含水量升高，沙棘细根生长速率逐渐增大。[结论] 砒砂岩地区沙棘液流变化是影响土壤水分变化的主要因素，而沙棘细根变化同样影响土壤水分的变化，相对而言，沙棘液流变化比沙棘细根变化影响土壤水分变化大。说明植物蒸腾是砒砂岩区影响土壤水分变化的主要因素。
[Objective] The response of soil water content to the change of the flow rate and fine roots of Hippophae rhamnoides in the feldspathic sandstone area was studied in order to provide reference for the rational cultivation and management of H. rhamnoides in the arid and water-deficient area.[Methods] The stem sap flow of H. rhamnoides plantations in Wenshui Township, Zhungeer Banner, Ordos City was monitored by using Granier stem sap flow measurement system for a long time, and the fine roots of plants and the soil moisture around the fine roots were measured at the same time, and the response of stem fluid flow and fine root changes to soil moisture in the growing season (September and October) of the H. rhamnoides plantation were analyzed using correlation analysis.[Results] ① The soil water content and the flow rate of H. rhamnoides were lower in the early period (June to July), increased in the middle and late period (July to September), and decreased rapidly in the late period (September and October). The growth rate of fine roots of seabuckthorn was higher in the middle and late period, and lower in the early and late period. ② The variation trend of soil water content and sea-buckthorn fluid flow rate in each month during the growing season was consistent, and the descending order was as follows:August >July >September > June >October. ③ There was a significant positive correlation between the change of soil water content and the flow rate of sea-buckthorn (p<0.01). With the increase of soil water content, the flow rate of sea-buckthorn gradually increased. The growth rate of fine roots of sea-buckthorn was positively correlated with the flow rate of sea-buckthorn (p<0.05). The faster the growth rate of fine roots of sea-buckthorn was, the higher the flow rate of sea-buckthorn was. On the contrary, the slower the growth rate of fine roots of sea-buckthorn was, the lower the flow rate of sea-buckthorn was. There was a significant positive correlation between soil water content and fine root growth rate (p<0.01). With the increase of soil water content, the fine root growth rate of seabuckthorn gradually increased.[Conclusion] The change of H. rhamnoides sap flow is the main factor affecting the change of soil moisture in feldspathic sandstone area, and the change of fine root of H. rhamnoides also affects the change of soil moisture. Relatively speaking, the change of sap flow of H. rhamnoides is greater than that of fine root of H. rhamnoides. Transpiration is the main factor affecting soil moisture in feldspathic sandstone area.