九龙江口水体中1995年有机物的转移

Transfer of organic mather in Jiulongjiang Esturine waters, 1995 cruises

1995年3个航次调查研究结果表明，九龙江口水体总有机物的含量受悬浮物含量控制。在S＜5的低盐度区，悬浮泥沙和有机物产生明显的絮凝沉降；在S＞5的广阔海域，它们的迁移接近于理想混合。估算得出九龙江河流的入海通量约：悬浮泥沙为9．8×105t／a；总COD为3．2×104t／a，其中溶解态COD为2.1×104t／a，约占2／3，为水体有机物的主要形态，如换算为溶解有机碳，则DOC的平均通量为3．2×104t／a。

Based on the investigation data of the three cruises in 1995, the transfer and input fluxesof organic matter in the Jiulongjiang Estuary have been studled. The results indicate that thedistribution and transfer of organic matter are controlled be suspended materials(SPM). Theflocculation and sedimentation of SPM and organic matter occur obviously when S<5, andthey are transferred conservatively when S>5. lt has been estimated from different cruisesthat the input flux of silt from the Jiulongjiang River ranges between (6. 9～ 13. 5) ×105t/awith an average of 9. 8 ×105t/a, and that of COD between (24. 7～43. 7) ×103t/a with amean of 31. 8×103t/a. The mean flux is about 20. 6×103t/a and accounts for 2/3 of the totalinput for dissolved COD, while 11. 2×103t/a and 1/3 respectively for particulate COD, indi-cating that the input of organic matter is dominated by the dissolved form. lf the dissolvedorganic matter is expressed by DOC, the mean flux of DoC will be 31. 7×103t/a. The meanfluxes from Jiulongjiang River during 1992 to 1995 are as following SPM 1. 2 ×106t/a,CODT4. 0×104t/a,CODd 3. 0×104t/a, and DOC 3. 8×104t/a respectively, if the data of the cruisesduring 1992 to 1993 are included.