九龙江河口区有机物的转移和入海通量

Transfer and input flux of organic matter in Jiulong Estuary

1992～1993年4年个航次调查结果表明，九龙江河口区水体中总有机物的含量和转移与悬浮物含量密切相关。当SPM含量低时，其转移过程接近于理想行为；当SPM含量高时，则为非理想行为。估算得出，九龙江水悬浮泥沙入海通量约为142×104t／a；总COD的入海通量约为48．3×103t／a。其中，溶解态COD为38．4×103t／a，约占80％，表明有机物的转入以溶解态为主，如溶解态有机物以DOC表示，则DOC的入海通量为42．1×103t／a。研究还表明，水体溶解有机物的转移接近于保守行为。

Based on the investigation data of the four cruises during 1992 to 1993,the transfer and input flux of organic carbon in Jiulong Estuary area have been studied. The resuIts indicate that the distribution and tranfer of organic matter in the estuary are closely correlated with suspended materials(SPM). Its transfer is nearly conservative when SPM content is low,and non-conservative as SPM is high. It has been estimated from different cruises that the input flut of silt from Jiulong River ranges between(2. 7~28. 2) ×105t/a with an average of 1.4×106t/a iand that of COD between(3. 5~6.0)×104t/a with a mean of 4.8×104t/a. The flux of dissolved COD ranges over(2.5~5.4)×104t/a with an average of 3.8×104t/a and accounts 79% of the total input,while that of particulate COD,ranging between (0.3~18.5)×103t/a with a mean of 1.0×104t/a,accounts for 21% indicating that the input of organic matter is domminated by the dissolved form. As the dissolved organic matter is represented by DOC,the mean flux of DOC is about 4.4 ×104t/a. The dissolved matter behave nearly conservatively in the estuary.