文蛤养殖环境底质硫化物和水体COD的关系

以文蛤密度为主要生态因子进行室内实验,研究硫化物和COD的变化特点及其两者之间的依存关系。文蛤密度梯度设置为:0粒/m2、50粒/m2、100粒/m2、200粒/m2、400粒/m2、800粒/m2,分别设定为:对照组、1组、2组、3组、4组、5组。结果表明:随文蛤密度加大,硫化物量值和COD量值产生幅度加大,溶解氧的消耗急剧增加,水质的恶化愈提前,这表明文蛤密度是水质恶化的原因之一。硫化物量值和COD量值变化的波动性亦随文蛤密度的加大而加大。各实验组中,硫化物量值和COD量值具显著正相关,硫化物量值变化与COD量值变化相匹配,并且硫化物高值与COD高值的出现基本吻合,并稍微滞后。

The relationship between the sulfuret in substrate and the COD in water of hard clam breeding area

Hard clam density factor was tested in chamber to study the relationship between the sulfuret and the COD and their change character.The gradients of hard clam density of 0 ind/m~2,50 ind/m~2,100 ind/m~2,200 ind/m~2,400 ind/m~2,800 ind/m~2 were set in control group Ⅰ,group Ⅱ,group Ⅲ,group Ⅳ and group Ⅴ,respectively.The results showed that along with the increase of density of hard clam,values of sulfuret and COD enlarged,the consumption of dissolved oxygen speeded up,and the water quality deteriorated more ahead of time.This indicates that the density of hard clam is one of the reasons of deterioration of water quality.In every group,the values of sulfuret and the COD have an evident correlation,the value of sulfuret matches with the value of COD in the main and we can notice that the high value of sulfuret lags behind that of COD.