白洋淀典型挺水植物净化水质效果

通过在白洋淀建立种植芦苇及香蒲的围隔实验区,研究挺水植物对水质的影响。从2011年7月到8月每周采样一次,共7次。测定水中溶解氧(DO)、透明度(SD)、高锰酸盐指数(CODMn)、总氮(TN)、总磷(TP)。实验结果表明:实验围隔内水质明显好转。在实验组中,香蒲高密度围隔实验区对于水质改善作用最为明显,对DO、SD、TN等改变率分别达到120%、81%、29.41%。而对于水中CODMn、TP去除,第三组中密度芦苇围隔实验区相对更好,其改变率分别达到20%、36%。第七组香蒲与第三组芦苇富营养化指数分别为41.64和44.07,低于同期对照组54.43。因此,在水体修复中可选择种植高密度香蒲、中密度芦苇净化水质,这对于改善白洋淀水质有着重要的意义。

Purification of Typical Emergent Aquatic Plant on Eutrophicated Water in Lake Baiyangdian

The effects of typical emergent plants on eutrophicated water body in Baiyangdian Lake were studied. The reed (Phragmites australis) and cattail (Typha latifolia) of were chosen and planted in different density in enclosures. Water samples in enclosures were collected every for 7 times from July to August in 2011. The concentration of pH, dissolved oxygen(DO), transparency(SD), potassium permanganate index (CODMn), total nitrogen(TN) and total phosphorus(TP) were determined. The results showed that the water quality turned to be better obviously and the eutrophication levels were reduced, The purification effect was most obvious in the enclosure with high-density cattail. The change rates of DO, SD and TN were 120%, 81% and 29.41% . The enclosure with middle-density reed was the more effective to eliminate the CODMn and TP. The efficiency rate was 20% and 36% respectively. The corresponding water eutrophication indices of were 41.64 and 44.07, lower than the controlled group 54.43. It has the important significance improving water quality of Baiyangdian Lake