不同品种黑麦草对富营养化水体净化能力的比较

Comparative studies on the purification ability of different kinds of ryegrass(Lolium L.) in a eutrophic water body

利用浮床植物系统研究了不同品种黑麦草在富营养化水体中的生长特性和净化效果差异.结果表明,12个黑麦草品种在冬春季富营养化水体中均能良好生长,净化效果非常明显,对TN、TP、CODMn和BOD5的去除率分别高达73.68%、84.69%、87.87%和75.85%;同时,还能使富营养化水体中pH值降低,溶解氧浓度明显升高.室内试验植物地上部N、P积累量分别在46.86～145.25mg·m-2·d-1之间和11.39～42.74mg·m-2·d-1之间;室外试验植物地上部N、P积累量分别为61.5～168.2mg·m-·2d-1和11.9～47.2mg·m-2·d-1;且植物体内N、P积累量与其生物量之间存在着明显的相关性(r≥0.90).品种间差异显著(p<0.05),其中,以邦德、安格斯2号和牧杰对富营养化水体净化的综合能力表现最好.

The growth characteristics of different varieties of ryegrass （Lolium L. ） and their ability to purify eutrophic water were studied using floating plant-beds. The results showed that twelve （varieties of ryegrass grew well in the eutrophic water, and their purification efficiencies differed significantly （p 〈 0.05 ）. Removal rate of TN, TP, CODMn and BOD5 in eutrophic water bodies were up to 73.68% , 84.69% , 87.87% , 75.85% , respectively. In addition, the pH decreased and DO increased in the eutrophic water bodies. The N and P accumulation in the aboveground plants in the indoor experiments were 46.86 - 145.25 mg·m^-2· d^-1 and 11.39 - 42.74 mg·m^-2· d^-1, respectively, and in the outdoor experiment were 61.5 - 168.2 mg.m-2, d-1 and 11.9 - 47.2 mg·m^-2· d^-1, respectively. There were obvious correlations between N and P accumulation in the plants and their biomass （r ≥ 0.90）. However, there were significant differences between varieties （p 〈 0.05）, and the performance of Bond, Angus 2 and Major were the best for purifying eutrophic water.