石佛寺人工湿地不同营养特征淤积物对水生植物生长的影响

为研究淤积物营养特征对不同生长时期内水生植物生物量的影响，在石佛寺水库人工湿地采集对比了芦苇（Phragmites communis）和蒲草（Typha angustifolia）两种不同水生植物区域内的淤积物和生物植株，研究了不同营养特征淤积物对水生植物生物量的影响。结果表明:淤积物内营养特征与各时期内水生植物的生物量具有一定的相关关系。生长初期，芦苇和蒲草的生物量与淤积物中氮元素（N）和磷元素（P）呈负相关，其中与TP含量的相关性达到显著水平（p<0.05），即较高的淤积物中营养元素含量会对水生植物的生长产生抑制作用；随着水生植物的进一步生长，这种抑制作用逐渐变小，并逐渐转变为促进作用，淤积物中营养元素含量与水生植物生物量的相关关系由负相关转为正相关；水生植物进入成熟期后，芦苇和蒲草的生物量达到最大值，淤积物内TN及TP含量均与水生植物的生物量呈显著正相关关系；之后随水生植物死亡腐解，这种关系逐渐消失。淤积物营养水平会对水生植物生长产生影响，主要表现在生物量的累积上。不同水生植物生长所受影响有所差异，蒲草的生物量与淤积物中营养元素含量的相关性更高。

Effects of Sediments with Different Nutrient Characteristics on the Growth of Aquatic Plants in Shifosi Constructed Wetland

The effects of the nutrient characteristics of the sediments on the biomass of aquatic plants in different growth periods were studied by collecting sediments and biological plants in the different wetland areas with the growth of non-reed and the bulrush in the constructed wetland of Shifosi Reservoir, and the effects of sediments with different nutrient characteristics on aquatic plant biomass were compared. The results showed that the nutrient characteristics of the sediments had a certain correlation with the biomass of aquatic plants in each period, in the early growth stage, the biomass of the reeds and the grasses was negatively correlated with the nitrogen and phosphorus in the sediments, the correlation of biomass with TP content reach the significant level (p<0.05), indicating that the higher nutrient content in the sludge inhibited the growth of aquatic plants; with the further growth of aquatic plants, the inhibition effect gradually became weaker, and gradually transformed into the promoting effect, the correlation between nutrient content and aquatic plant biomass in the sediment changed from negative correlation to positive correlation; after the aquatic plants entered maturity, the biomass of reed and raupo reached the maximum, and the contents of TN and TP in the sediments were significantly positively correlated with the biomass of aquatic plants; this relationship gradually disappeared with the process of the aquatic plant exsciccation. The nutrient level of sediment affects the growth of aquatic plants, mainly affects the accumulation of biomass. The growth of different aquatic plants is affected differently, and the biomass of the grass is highly correlated with the nutrient content in the sediment.