翅碱蓬处理凡纳滨对虾养殖尾水效果的初步研究OA

In order to study the purification effect of tailwater of the saline-alkali tolerant plant Suaeda heteroptera,the experiment of tailwater treatment of Litopenaeus vannamei aquaculture was carried out under static water for 30 days.The initial heights and diameters of plants used were(6.83±0.35)cm and(2.12±0.13)mm,respectively.The planting densities of four groups were set as 0 plant·m-2(group A),40 plants·m-2(group B),80 plants·m-2(group C),and 120 plants·m-2(group D).The results showed that the salinity of group A decreased by 56.17%,and the salinity of group C decreased by 79.74%.The pH of each treatment group increased first and then decreased.At the end of the experiment,the pH of water in groups B,C and D was significantly higher than that in group A(P<0.05).The content of dissolved oxygen(DO)in the tailwater increased with the increase of planting density of S.heteroptera.Increasing the planting density of S.heteroptera had a significant effect on reducing the contents of total ammonia nitrogen,nitrite(NO2--N),nitrate(NO3--N)and active phosphorus(PO43--P)in the tailwater.However,the removal effect of chemical oxygen demand(COD)was not significant.These findings suggest S.heteroptera can effectively purify the tailwater from L.vannamei aquaculture and reasonable increase of planting density is beneficial to improve its purification effect on aquacultural tailwater.