摘要
[目的]研究浮床空心菜对稻虾鳝共作稻田环沟水体的净化作用。[方法]分别在占环沟水面积10%、20%和30%的浮床上栽培空心菜,研究不同空心菜覆盖率对稻虾鳝共作稻田环沟部分水质指标(p H、溶解氧、氨氮、亚硝酸氮含量)的影响。[结果]空心菜浮床能有效稳定水体p H。空心菜浮床能提高养殖水体溶解氧含量,空心菜覆盖率与水体溶解氧含量成正比。通过空心菜的浮床栽培,稻田环沟水体中氨氮的水平控制在1.00 mg/L以下,亚硝酸氮水平则控制在0.03 mg/L以下。当空心菜覆盖率为20%与30%时,氨氮和亚硝酸氮含量最低,但考虑到浮床成本,以20%的浮床覆盖率为宜。[结论]该研究可为水稻-黄鳝-克氏螯虾种养模式的发展与改进提供理论依据。
[Objective] To understand the purification of water spinach on floating bed on the water quality of circular groove in paddy field in co-culture of rice,shrimp and eel.[Method]Water spinach was planted on floating bed that took account for 10%,20% and 30% respectively in total water area of circular groove. The effects of different coverage with water spinach on some water quality indices（ pH,dissolved oxygen,ammonia nitrogen,nitrite nitrogen） of circular groove in paddy field in co-culture of rice,shrimp and eel were studied.[Result]Water pH could be effectively stabilized by floating bed with water spinach. The content of dissolved oxygen in the aquatic water could be also improved by floating bed with water spinach,and the content of dissolved oxygen was proportional to the coverage of water spinach. By planting water spinach on floating bed,the content of water ammonia nitrogen in circular groove of paddy field reduced to less than 1. 00 mg / L and the content of nitrite nitrogen reduced to less than 0. 03 mg / L. When the coverage of water spinach was 20% or 30%,the content of ammonia nitrogen and nitrite nitrogen reached the minimum. Considering the cost of floating bed,the optimum coverage of water spinach was 20%.[Conclusion]The research can provide theoretical basis for developing and improving co-culture model of rice,eel and shrimp.
出处
《安徽农业科学》
CAS
2015年第36期91-93,共3页
Journal of Anhui Agricultural Sciences
基金
上海农林职业技术学院科研项目(KY1-0000-14-05)
关键词
稻虾鳝共作
空心菜
覆盖率
水质
Co-culture of rice
shrimp and eel
Water spinach
Coverage
Water quality
