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我国北方地区多盐碱地,难以进行农作物的种植,以前多是在这些地区开挖池塘进行水产养殖,近年来高密度集约化的精养方式在提高水产品产量的同时也产生了诸多问题:如前期肥水过度,导致中后期水质恶化;投饵过量,残饵及粪便沉积使水中氨氮、硫化氢、亚硝酸盐超标,水体缺氧、水质富营养化;由此导致疾病频发,鱼、虾、蟹死亡腐烂,进一步造成水质腐败恶化,陷入恶性循环。养殖效益骤降,最终使多数池塘废弃。究其根源,水体中的氨氮等有机物过
In northern China, there are many saline-alkali lands that are difficult to grow crops. In the past, most of them were digging ponds for aquaculture in these areas. In recent years, intensive intensive cultivation methods have raised many problems in aquatic products production, Overdose of fertilizer and water leads to deterioration of water quality in the middle and later stages; excessive feeding, residual bait and sediment deposition cause ammonia nitrogen, hydrogen sulfide and nitrite in the water to exceed the standard, water body is oxygen deficient and water quality is eutrophication; Crab death decay, further deterioration of water quality corruption, into a vicious circle. The benefits of aquaculture plummeted, eventually discarding most of the ponds. The root causes, ammonia and other organic matter in the water too