桑沟湾多元养殖生态模型研究:Ⅲ海带养殖容量的数值研究

Study on ecosystem model of multi-species culture in Sanggou Bay:Ⅲ Numerical study on the kelp culture carrying capacity

基于已建立的桑沟湾多元养殖生态模型,模拟得到桑沟湾海带的生长情况和最终的产量分布。并且运用数值实验的方法,通过改变海带养殖密度,探寻桑沟湾海带的养殖容量。结果表明,养殖密度越大,对海水流动的阻碍作用越强,海带生长期间由外海补充到湾内的无机氮营养盐就越少。因此,提高养殖密度,最终海带产量并非相应增加。由模型实验得到,0.9倍于现有养殖密度为最适养养殖密度,对应的最大海带养殖产出为7.21万t淡干重。

Based on the multi-species culture ecosystem model in Sanggou Bay,numerical experiments were done by altering the kelp culture density. The aim is to probe the kelp culture carrying capacity in Sanggou Bay. Increase of the kelp culture density at the same time enlarged the frictions caused by the culture activities,which inhibited the supply of dissolved inorganic nitrogen （DIN） from the open sea. As a consequence,there is no definite increase in the kelp production. Model results for different kelp culture densities indicated that the kelp production reached the peak when the culture density was 0.9 fold of the present one.