白洋淀漂浮植物对挺水植物和沉水植物分布的影响

Effect of Floating Plants on Distributions of Emergent and Submerged Plants in Baiyangdian Lake

为了探究白洋淀地区漂浮植物对挺水植物和沉水植物分布的影响,于植物生物量达到最高峰时的8月,获得了6个主要淀区的18条样带水生植物的地上生物量和水深数据,对有或无漂浮植物对挺水植物、沉水植物地上生物量及二者与水深之间的关系是否具有调节作用进行了研究。结果发现,有漂浮植物区挺水植物和沉水植物地上生物量显著小于同等环境下无漂浮植物区,漂浮植物对沉水植物地上生物量与水深的关系具有调节作用,而对挺水植物地上生物量与水深的关系不具有调节作用。

In this paper, effects of floating plants on the distributions of emergent and submerged plants in Baiyangdian Lake were investigated. Aboveground biomasses of all aquatic plants （Phragmites australis, Typha angustifolia, Nelumbo nucifera, Salvinia natans, etc.） and water depth were measured at 18 transects, setting in 6 water areas of Baiyangdian Lake. The investigation was conducted in August 2012, when plant biomasses reached the peaks. The results showed that floating plants could influence the distributions of other species. Both aboveground biomasses of the emergent and submerged plants with the floating plants were less than those without the floating plants. Meanwhile, the floating plants play a role in relationship between water depth and aboveground biomass of the submerged plants, but not in that between water depth and aboveground biomass of emergent plants. The floating plants would suppress the growth of emergent and submerged plants and affect the distributions of submerged plants at different water depths.