摘要
在假设温度恒定?弱化营养盐限制作用的条件下,利用太湖背景漫射衰减系数?日变化太阳辐射等数据,通过下沉藻生长与水环境相结合的耦合模型,模拟下沉藻增长过程中垂向湍流扩散和光之间的耦合.结果表明:在相对清洁水体中(背景漫射衰减系数小于1.1/m),下沉藻类无需垂向湍流扩散均可维持增长;混浊水体中(背景漫射衰减系数介于1.1～3.0/m)下沉藻类增长需垂向湍流扩散维持,且最低垂向湍流扩散值随背景漫射衰减系数增大而增大,二者间存在指数函数关系;最低垂向湍流扩散(D)?水深(z)与藻类下沉速度(v)间的佩克莱数应位于0.38～13.89,否则垂向湍流扩散对比其他因素(藻类沉降和光衰减),对水柱中下沉藻类的增长的作用甚小;当背景漫射衰减系数大于3.0/m,水柱平均光能可能难以满足藻类增长,藻类持续消亡.该研究有助于厘清气候变化背景下水生生态系统中的浮游植物种群演替机制.
Based on the assumption of constant temperature and no nutrient salt limitation, a mathematical model coupling sinkingalgae growth and water environment of Lake Taihu was used to investigate the effect between the vertical turbulent diffusion andbackground diffused attenuation coefficient(K_(bg)) on the growth of sinking algae. The simulation results showed that the total biomassgrowth of the sinking algae could be sustained without vertical turbulent diffusion in the relatively clean water(K_(bg) was less than1.1/m); in turbid water(K_(bg) was between 1.1～3.0/m), the growth required vertical turbulent diffusion to maintain, and the minimumvertical turbulence diffusion increased with the K_(bg). The Peclet number between the minimum vertical turbulence diffusion(D), waterdepth(z) and the algae sinking speed(v) should between 0.38～13.89, otherwise the minimum vertical turbulence would have littleeffect on the growth than other factors(for example, algae sinking speed or light attenuation). When the K_(bg) was greater than 3.0/m,the light intensity of the water column was too low to maintain the total biomass growth of algae. This paper helped to clarify thephytoplankton population succession mechanism in aquatic ecosystems under climate change.
引文
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