不同文蛤密度下冲氧与否对水质变化影响的比较研究

以文蛤密度为主要生态因子进行室内实验,研究不同文蛤密度下冲氧与否对水质变化影响。总设12个实验组:1-6组培养箱中的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,实验期间冲气培养;设与上述对应的7-12组,不冲气培养。结果表明:非冲气时水质变坏较早,密度大时水质变坏较早,文蛤不存在的对照组,非冲气的条件下水质随时间推移恶化同样明显。在水交换条件差的海域,文蛤养殖密度不得超过50粒/m2。

Research on comparison in impact of seawater quality depravation with oxygen supplied or not in diferent desity of hard clam

Taking the density of hard clam as main ecological factor,a test is made to research on the impact of seawater quality depravation with oxygen supplied or not.It consists of 12 test groups.In the groups from No.1 to No.6,the desity of hard clam is graded as 0/m2,50/m2,100/m2,200/m2,400/m2,800/m2,in the test,oxygen is supplied.In the corresponding groups from No.7 to No.12,oxygen is not supplid.The findings show that the group in which oxygen is not supplied is depravated earlier;the group in which the desity of hard clam is higher is depravated earlier;in the corresponding group where there is no hard clam,depravation of water quality is also evidently depravated as time passes if oxygen is not supplied.So in the sea area with poor exchange of sea water,the density of hard clam should not be more than 50/m2.