苏北盐城海岸带芦苇湿地对营养物质的净化作用初步研究

对在不同污灌强度下的苏北盐城海岸带两片芦苇湿地的调查发现:在常规水质灌溉下,营养物质在2 km长的廊道中的自净率为12.0%~45.6%,苇田净化率在29.2%~95.65%之间;在超负荷污水灌溉下,廊道中的自净率在6.5%~8.7%之间,苇田净化率为61.3%~86.2%,单位面积净化效果是常规水质灌溉下的3.2~123倍。净化效果的巨大差异,说明对苏北盐城海岸带芦苇湿地净化污染物功能的利用还存在巨大的潜力和空间。

Preliminary study on purification function of reed wetland for nutrients in coastal zone of Yancheng

Surveying purification function of two patches of reed wetland was managed by effluent irrigation with different intensities in the coastal zone of Yancheng. The results show that, under general irrigation by river water, the purification rates for N, P and COD are 12.0% -45.6% in a 2 kin-length channel and 29.2%-95.65% in the reed field. Under effluent irrigation with sewage from paper mill, the purification rates for N, P and COD are 6.5%-8.7% in the channel and 61.3%-86.2% in the reed field. About 0. 095 t of total N, 0. 026 t of total P and 2.5 t of COD can he removed from reed wetland per hectare per year, the purification effieiency of the reed wetland per unit was 3.2,18. 5 - 123 times as that of general irrigation by general irrigation with river water, respectively. The gap of the purification efficiency between general irrigation reed wetland and effluent irrigation reed wetland shows that there are great potential and space for utilizing the purification functions for nutrients of the reed wetlands in the coastal zone of Yancheng.