Clonal fragmentation (CF), caused by various disturbances, significantly affects the growth performance of plants. However, little is known about how CF affects the growth of submersed macrophytes facing light limitation and nutrient enrichment, a typically situation found in eutrophic lakes. To examine the effects of CF on Vallisneria natans (Lour.) Hara, a common submersed macrophyte species in warm lakes, we combined three different light intensities (4%, 15%, and 30% natural light) with three different nutrient levels in the water and kept the stolons severed or intact. We found that CF negatively affected the growth of V. natans and that the effect strongly depended on light and nutrient levels. Our comparison between severed and intact plants showed that CF decreased the biomass accumulation under moderate-light conditions, whereas no significant difference appeared at low and high light levels. The negative effect of CF on plant biomass tended to be more significant at moderate and high nutrient levels. The total chlorophyll content decreased with CF at moderate and high nutrient levels when light availability was high. Our study adds new information about the role of CF on the survival and growth of submersed macrophytes in eutrophic lakes.

由各种干扰引起的克隆碎片（CF）会严重影响植物的生长性能。然而，关于CF如何影响面临光限制和营养富集的淹没大型植物的生长，人们知之甚少，这是在富营养化湖泊中常见的情况。为了研究CF对温暖湖泊中常见的沉没植物植物Vallisneria natans（Lour。）Hara的影响，我们将三种不同的光照强度（4％，15％和30％自然光）与三种不同养分水平结合在一起。浇水，使茎割断或完整。我们发现CF对纳丹弧菌的生长有负面影响效果很大程度上取决于光照和营养水平。我们对切断植物和完整植物的比较表明，CF在中度光照条件下减少了生物量的积累，而在低光照和高光照条件下均没有显着差异。在中等和高营养水平下，CF对植物生物量的负面影响往往更为明显。当光能利用率高时，在中等和高营养水平下，总的叶绿素含量随CF降低。我们的研究增加了关于CF对富营养化湖泊中沉水植物的生存和生长的作用的新信息。