4种草坪草在不同土壤介质中去除雨水氨氮的效果

Effect of removing ammonia-nitrogen in rain of four turfgrasses grown in different soils

为了考察在海绵城市雨水花园建设中典型草坪植物对城市非点源污染中氨氮的去除效果,采用盆栽试验的方式,研究了不同土壤渗滤层下4种典型草坪植物(地毯草、早熟禾、高羊茅、黑麦草)对模拟径流污染中氨氮的去除效果。结果表明:以沙土Ⅱ为土壤渗透层的雨水花园具有更好的氨氮去除能力;在以沙土Ⅱ为土壤渗透层的雨水花园中四种典型草坪植物的氨氮去除率能达到93.90%~99.90%,去除效率由高到低分别为黑麦草、地毯草、早熟禾、高羊茅;一定氨氮浓度范围内,随着氨氮浓度的升高,4种草坪草对氨氮污染物的去除能力也提高;4种草坪草中,将高羊茅与黑麦草配合种植对氨氮污染物的截留及去除能力最强。

The ammonia-nitrogen removing effect of 4 typical turfgrasses（ carpet grass,Kentucky bluegrass,tall fescue and perennial ryegrass） was studied.The results showed the soil layer of sandy soil-II performed better effect of removing ammonia nitrogen,and the order of ammonia-nitrogen removal rate from high to low was perennial ryegrass,carpet grass,Kentucky bluegrass and tall fescue,ranging from 93.90% to 99.90%. And the ammonia-nitrogen removal rate was increased with the increase of ammonia nitrogen concentration. The mixture of tall fescue and perennial ryegrass showed highest ammonia-nitrogen removing capacity.