桑沟湾养殖区春季pCO2分布特征及影响机制

Distribution and affecting factors of pCO2 in aquaculture areas of Sanggou Bay during spring

中文关键词: 桑沟湾  养殖区  pCO2

英文关键词: Sanggou Bay  Aquaculture area  pCO2

中文摘要:

      2012年5月27~29日对桑沟湾贝类养殖、贝藻混养、藻类养殖等区域水-气界面区pCO2等参数的连续走航和贝类养殖区的日变化观测，讨论了桑沟湾不同养殖区域水-气界面区pCO2的分布特性及机制。结果显示，在该航次水质及气候条件下，桑沟湾养殖区域叶绿素偏高，溶解氧始终处于过饱和状态，最高达140%，强烈的浮游藻类光合作用消耗大量无机碳，水-气界面始终是大气CO2的汇。其中贝类养殖区pCO2低于贝藻混养区，低于藻类养殖及湾外近海区域。当然，这还不足以说明这一海区水-气界面可能是大气CO2的汇区，需要精细的航次计划做全面观测，例如养殖区域沉积的大量颗粒有机物在某些特定条件下的再悬浮、降解对水气界面CO2的贡献以及实际意义上的埋藏通量究竟有多大等。

英文摘要:

      Based on continuous measuring of pCO2 and other carbon parameters in the shellfish beds, shellfish-algae co-culture areas and algae farming areas of Sanggou Bay from 27th to 29th May, 2012, as well daily observation in the shellfish beds, the distribution characteristics and affecting factors of pCO2 between air-sea interface in the different aquaculture zones of Sanggou Bay were discussed in this paper. It was found that Chl-a was extremely high during the investigations. As a result, dissolved oxygen was always saturated, even up to 140% saturation, while a large amount of inorganic carbon was strongly consumed by photosynthesis. Thus, this area was considered to be a CO2 sink.More specifically, pCO2 of the shellfish beds was small compared to that of the shellfish-algae co-culture area, algae farming area and coastal zones. Undoubtedly, this investigation is not enough to prove that Sanggou Bay is a CO2 sink, but more observations are still needed in large temporal-spatial scales in order to answer the questions such as how much the resuspension and degradation of the deposited particulate organic matter contributes to the pCO2 in the water-air interface, and how much the particulate organic matter is actually buried, etc.