中文摘要：

通过大田试验研究了不同滴灌方式利用咸水灌溉对棉花根系分布的影响。结果表明，2种滴灌方式下土壤中的水分和盐分在1m土体内随土壤深度的增加和咸水浓度的增加而增加，且由于滴头的洗盐作用，地表滴灌和地下滴灌方式下土壤中的水盐分布深度均有所下移。正是由于水盐在土壤有这样的分布特征，2种滴灌方式下不同盐度咸水灌溉后，作物不仅可以感受到变化了的环境信息，而且自发地改变结构形态、空间构型，即增加根长、根干重、根半径以及根表面积，对盐胁迫做出适应性的根系形态变化。

英文摘要：

A field experiment was conducted to evaluate the effects of saline water on distribution of cotton root under drip irrigation conditions. The results obtained are summarized as follows： The soil water content and soil salinity increased with the increasing of soil depth and water salinity level under both surface and subsurface drip irrigation. Due to the leaching function of drip-irrigation, soil salinity accumulated in deeper layer of soil, which impacted the distribution of cotton root. Cotton root growth in response to environmental stress and changed itself development structure. Irrigation methods had no effect on cotton root-weight, root-length, root-radius and root-surface area, but water salinity affected cotton root spatial distribution obviously. The root-weight, root-length, root-radius and root-surface area was increased with increasing of water salinity.