中文摘要：

研究植物吸水根系空间分布特征是建立植物根系吸水模型的基础。本文对极端干旱区荒漠河岸林胡杨的吸水根系空间分布特征进行研究。结果表明：在水平方向上，胡杨根长密度分布呈抛物线型，吸水根根量主要集中在0—350cm，此范围的吸水根根量占0-500cm总量的91．88％，350cm以外的吸水根量只占总量的8．12％；在垂直方向上，胡杨根长密度分布呈典型的负指数型，吸水根根量主要集中在0.80cm土层内，占0-140cm土层内总量的96．8％。

英文摘要：

To study the spatial distribution pattern of plant fine root is the basis of constructing water uptake model of plant roots. The study on the spatial distribution pattern of Populus euphratica fine roots in desert riparian forest showed that horizontally, the distribution of P. euphratica root length density presented a parabola curve. The fine roots were concentrated within the range of 0 - 350 cm from the tree trunk, and their amount occupied 91.88% of the total within 0 - 500 cm. In vertical direction, the distribution of the fine root length density showed a negative exponent correlation with soil depth. The fine roots were concentrated in 0 - 80 cm soil layer, and their amount accounted for 96.8% of the total in 0 - 140 cm soil layer.