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The environment of Lake Taihu has changed a great deal in recent decades. Wetland plant restoration is considered an efficient way to keep it healthy. However, restoration efforts are affected by environmental factors which have important influences on wetland plant growth. In order to study the mutual effects of water depth and sediment type on the growth of aquatic plants, the impacts of the two environmental factors on root morphology of the submerged plant Vallisneria natans were investigated in an outdoor pond experiment. Treatments included three levels of water depth (60, 120 and 180 cm) and two sediment types (clay and sandy loam). Results showed that root/leaf mass ratio and root morphological parameters (root diameter, root length, root area, root volume, specific root length and specific root area) of the plant generally decreased with increasing water depth, with reductions of 12.64% in root diameter and 97.40% in root mass in clay and 28.82% in root diameter and 97.98% in root volume in sandy loam.
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