春季深澳湾龙须菜固碳量及其影响因素

在深澳湾开展龙须菜养殖试验及实地调查,以 2014 年春季为例估算深澳湾龙须菜的固碳能力及环境因子对其固碳能力的影响。结果显示:深澳湾 2014 年春季龙须菜总固碳量约为 631.9 t。海水温度变化范围为 13.94~22.97℃,龙须菜的生长速率为 2.44%/d~6.40%/d。水温和光照影响龙须菜光合色素的含量进而影响其生长速率和光合效率的高低,是决定固碳速率的关键因子。深澳湾水体的低营养状态导致龙须菜生长较为缓慢,也是限制固碳量的重要因素。通过改变挂养深度和人工施肥的方式可以有效的促进生长,增加固碳量。

Carbon fixation of Gracilaria lemaneiformis and its environmental regulation in Shen'ao bay in spring

The capacity for carbon fixation of G.Lemaneiformis was estimated based on the cultivation experiments and field investigation in Shen'ao bay, in spring 2014.At the same time, we analyzed how its carbon fixation ability is affected by environmental factors.The results show that the total carbon fixed by G.Lemaneiformisis about 613.9 t in spring.The seawater temperature ranged from 13.94℃ to 22.97℃ during the experiment.The growth rate of G.Lemaneiformis ranged from 2.44%/d to 6.40%/d.The temperature and light affected the light-harvesting pigment and thus affected the growth rate and photosynthesis of G.Lemaneiformis.This is the key factor that affects the rate of carbon fixation by G.Lemaneiformis.Low nutrient supply inhibits the growth rate, and thus limit the carbon fixation of G.Lemaneiformis.Changing the way of cultivation plus artificial fertilization can effectively promote output, and increase the amount of carbon fixation.