陵水新村港网箱养殖海域水体中有机物含量特征分析

Characteristics of Organic Matter Contents in Waters of Cage Aquaculture Area in Xincun Port of Lingshui County

为了解陵水县新村港网箱养殖活动对水体水质的影响,2016年3月份测定了新村港海域水体中的生化需氧量(BOD_5)和化学需氧量(COD),并计算了BOD_5/COD比值.结果发现新村港整体水体中BOD_5范围为1.27-9.39 mg/L,COD范围为4.00-6.82 mg/L,BOD_5/COD比值范围为0.32-1.90.网箱养殖海域水体中的有机物含量显著高于非养殖海域水体(P<0.05),渔船码头附近水体中的有机物可生化降解性显著低于水体(P<0.05).结论:新村港海域水体中的有机物含量受网箱养殖活动影响较大;新村港水体水质属于Ⅲ类—Ⅳ类海水水质标准范围,目前水质状况难以满足网箱养殖活动的可持续开展.

In March, 2016, some parameters of biochemical oxygen demand （ BOD5 ）, chemical oxygen demand （COD） and the ratio of BOD5/COD in water were measured to assess the effects of cage culture activities on water quality in Xincun port, Linshui County. Results indicated that range of BOD5 and COD was 1.27 - 9.39 mg/L and 4. 00 - 6.82 mg/L respectively, and the range of BODs/COD ratio was 0. 32 - 1.90 in waters of Xincun port. In addition, the contents of organic matter were significantly higher in waters near the aquaculture net cages than those in other water columns （ P 〈 0.05 ）. Biodegradabili fishing piers than that in other water columns （ P 〈 0.05 ）. Conclus ty of organic matter was lower in waters of ion was drawn that cages culture activities have great effect on the contents of the organic matters and that the water columns in Xincun port fall in the range of m - rv sea water - quality standards. There is a great difficulty to carry out sustainable cage culture owning to current waterquality condition in Xincun port.