摘要
于2008年10月—2009年9月,采用黑白瓶测溶氧法对淀山湖湖南区和围隔区初级生产力进行逐月测定,依据测定的湖南区初级生产力估算鲢、鳙渔产潜力及合理放养量,讨论温度、透明度、营养盐、叶绿素a等理化因子与初级生产力的相关性,分析鲢、鳙放养对淀山湖水体营养物质的定量去除效果。结果表明:1)湖南区平均水柱日毛产量(PG)为4.02gO2.m-2,8月最高、1月最低,净产量(PN)为1.99gO2.m-2,年PN/PG=52%;2)0～0.5m水层对水柱初级生产力贡献最大,湖南区占32.3%、围隔区占32.2%;3)初级生产力与透明度、水温呈明显正相关,与其他理化因子相关性不明显;4)淀山湖浮游植物年生产量为28.18×104t,按鲢鳙3:1比例放养,鲢渔产潜力为1621.58t,鳙为1216.18t,鲢合理放养量为16.94t.km-2,鳙合理放养量为6.35t.km-2;5)以淀山湖每年渔产2837.76t计算,可以固定氮、磷分别为85.50t、7.63t,由此可使淀山湖水体中氮、磷含量分别降低0.67和0.06mg.L-1。
By using dark and light bottle dissolved oxygen method,the fishery primary productivity in the south part and the experimental enclosure of Dianshan Lake was measured monthly from October 2008 to September 2009.Based on the measurement in the south part,the potential productivity and reasonable stocking amount of silver carp and bighead carp in the experimental enclosure were estimated,and the correlations of the primary productivity with the water temperature,transparency,nutrients,and chlorophyll-a were discussed.The nutrient removal effect of stocking silver carp and bighead carp was also discussed.In the south part of the Lake,the daily gross primary productivity （PG） was 4.02 g O2·m-2 on average,with the maximum in August and the minimum in January,the net primary productivity （PN） was 1.99 g O2·m-2,and the yearly PN/PG ratio was averaged 52%.The 0-0.5 m water layer contributed most to the primary productivity,with its contribution occupied 32.3% and 32.2% of the total in the south part and the experimental enclosure,respectively.The primary productivity was positively correlated with water temperature and transparency,but not significantly correlated with other physical and chemical factors.The yearly production of phytoplankton in the Lake was 28.18×104 t.If the stocking ratio of silver carp to bighead carp was 3：1,the potential productivity of silver carp and bighead carp would be 1621.58 t and 1216.18 t,and their reasonable stocking amount was 16.94 t·km-2 and 6.35 t·km-2,respectively.Based on these estimations,the total nitrogen and total phosphorus absorbed by the 2837.76 t fish would be 85.50 t and 7.63 t,and the nitrogen and phosphorus concentrations in the water body of Dianshan Lake would be decreased by 0.67 mg·L-1 and 0.06 mg·L-1,respectively.
出处
《生态学杂志》
CAS
CSCD
北大核心
2010年第7期1365-1370,共6页
Chinese Journal of Ecology
基金
上海市科委重大项目(08DZ1203103)
上海市农委四新项目(Y07-118)
上海市重点学科建设资助项目(S30701)
关键词
淀山湖
初级生产力
黑白瓶法
渔产力
Dianshan Lake
primary production
dark and light bottle method
fishery productivity
