无锡市河埒口高产鱼池水质研究 Ⅰ.水化学和初级生产力

STUDIES UN THE WATER QUALITY OF THE HIGH-YIELD FISHPQNDS IN HE LIE CUMMUNE, WU I SHI PART I.CHEMISTRY DF FISHPDND WATER AND PRIMARY PRDDiJCTIVITY

摘要: 本文总结了1977年5—8月对无锡河埒口高产池塘水化学研究的成果。该地区高产池主要离子含量适中,pH稳定。有效氮含量平均1.38毫克/升,其中铵氮占61%,亚硝酸氮占14%,硝酸氮占 25%。溶解活性磷（P₂O₅）平均为 0.028毫克/升。N/P 为 61—139。COD_Mn为 13.3毫克/升。磷是初级生产力的限制因素。经初步分析表明:池水中溶解有机物与悬浮有机物约各占一半,而有机碎屑占有机悬浮物的 2/3到 4/5。平均补偿深度 77—80厘米,为平均透明度的 2.4倍。5—8月间平均水柱日初级毛生产量为9.41—10.09克氧/米²·日。池水氧气的消耗,池鱼约占20%,“水呼吸”约占70%,底质约占 10%。氧气来源约 60%靠光合作用,40%靠空气溶解。

Abstract: This paper embodies the results of hydrochemical survey and tha estimations of phytoplanktoz production in eight high-yield fish ponds of Helie commume Wuxi from May to August 19TT. Three ponds of Wuxi Hu fish farm are also studied for comparison. The high-yield ponds have moderate main ions in content, with a ovnstant pH value The effective nitrogen of the water averaged 1.24mg jI, among which NH₄---N 61%，11TDa N i8 o and NO₂-N 24%. The soluble reactive phosphorus is 0.028 mg/L. COD_mn is 13.3mg/L. Owing to the high N/P value (61--139)，the phosphorus should be the limiting factor of the promary productivity.