河口区斑节对虾淡化养殖塘溶氧收支平衡状况

The incomings and outgoings budget of dissolved oxygen in Penaeus monodon desalting culture ponds in estuarine area

本文报道了 1 997年与 1 998年河口区斑节对虾淡化养殖塘生态系中溶氧收支平衡状况。表层水水柱毛产氧量均大于或显著大于水呼吸耗氧量 ,底层水毛产氧量却显著小于水呼吸耗氧量 ,呈现常有的“氧债”现象。在池塘氧耗因子中 ,水呼吸是最大的溶解氧消耗者 ,占水柱总耗氧量的 70 %以上 ;其次是底泥耗氧量 ,约占 2 0 % ;虾呼吸耗氧量所占比例较小 ,但随养殖时间的延长明显上升。斑节对虾塘平均补偿深度 (B)和平均透明度 (P)之比 (B/P)与通常鱼池所具有的比值 (1 .5～ 2 .5 )相比偏低 ,为 1 .42± 0 .5 3。说明池塘深层的产氧能力受到限制。

The paper reported incomings and outgoings budget of dissolved oxygen (DO) in the giant tiger prawn (Penaeus monodon) desalting culture ecosystem in estuarine area in 1997 and 1998. The gross oxygen production (GOP) of water column in the surface layer was more (even significantly) than the oxygen consumption of aquatic respiration (AR),but the GOP in the bottom was less evidently than the corresponding AR,which was the common “oxygen debt” phenomenon. Among the oxygen consuming factors,AR was the largest oxygen consumer,which made up more than 70% of the total oxygen consumption of water column;benthic respiration (BR) was the second and accounted for about 20% of the total oxygen consumption;the proportion of prawn respiration (PR) was lower and increased remarkably with culture period. The ratio (B/P) of mean compensation depth (B) to mean transparency (P) in Giant tiger prawn pond,1.42±0.53,was lower than that in fishpond (1.5～2.5). Therefore, the oxygen production in the depths of pond was reduced. DO in the Giant tiger prawn desalting culture pond was in disequilibrium, the outgoings outweighed the incomings.