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应用生态学报 ›› 2019, Vol. 30 ›› Issue (7): 2447-2456.doi: 10.13287/j.1001-9332.201907.035

• 研究报告 • 上一篇    下一篇

不同许氏平鮋与栉孔扇贝养殖系统水-气界面CO2通量及其主要影响因子

张东旭, 田相利*, 董双林, 王明阳, 刘龙镇   

  1. 中国海洋大学教育部海水养殖重点实验室, 山东青岛 266003
  • 收稿日期:2019-02-11 出版日期:2019-07-15 发布日期:2019-07-15
  • 通讯作者: * E-mail: xianglitian@ouc.edu.cn
  • 作者简介:张东旭,男,1989年生,博士研究生.主要从事水产养殖生态学研究.E-mail:dxzhang0580@163.com
  • 基金资助:
    “十二五”国家科技支撑计划项目(2011BAD13B03)和山东省杰出青年基金项目(JQ201009)

Carbon dioxide fluxes at the water-air interface and the main influencing factors from diffe-rent aquaculture systems of Sebastes schlegelii and Chlamys farreri

ZHANG Dong-xu, TIAN Xiang-li*, DONG Shuang-lin, WANG Ming-yang, LIU Long-zhen   

  1. Ministry of Education Key Laboratory of Mariculture, Ocean University of China, Qingdao 266003, Shandong, China.
  • Received:2019-02-11 Online:2019-07-15 Published:2019-07-15
  • Contact: * E-mail: xianglitian@ouc.edu.cn

摘要: 本试验建立了4组中型实验生态系统,即空白对照系统、许氏平鮋单养系统、栉孔扇贝单养系统和许氏平鮋-栉孔扇贝混养系统,利用静态箱-气相色谱法对各养殖系统水-气界面CO2通量进行观测,并测定养殖水体物理、化学和生物指标.结果表明: 试验期间,空白对照系统表现为稳定的对大气CO2的源,平均通量为12.42 mg·m-2·h-1.扇贝单养系统在试验前期和中期为CO2的源,后期为CO2的汇,试验期间整体为CO2的源,平均通量为10.95 mg·m-2·h-1.许氏平鮋单养系统和许氏平鮋-栉孔扇贝混养系统在试验前期表现为CO2源,实验中后期为CO2的汇,试验期间平均通量分别为-3.53和-10.49 mg·m-2·h-1,整体上均为对大气CO2的汇.回归分析结果显示,水体pH是水-气界面CO2通量较好的预测因子,pH=8.25是系统水-气界面碳源/汇功能发生转变的临界值.线性混合模型分析结果显示,水体净初级生产力是影响各系统水-气界面CO2通量的主要因子,表明浮游植物是调控系统水-气界面CO2通量的主要生物内动力.在本试验混养密度条件下的栉孔扇贝能一定程度上促进浮游植物生物量和水体初级生产力,从而增强系统水-气界面CO2的碳汇功能.

Abstract: The static chamber-gas chromatography method was applied to observe CO2 fluxes across the water-air interface from different aquaculture systems, including four groups of mesocosms, i.e., blank control system (CK), monoculture system of Sebastes schlegelii (F), monoculture system of Chlamys farreri (B) and polyculture system of S. schlegelii and C. farreri (FB). Meanwhile, the physical, chemical and biological indices of the water were measured. The results showed that the group CK was a stable CO2 source, with the mean flux of 12.42 mg·m-2·h-1. The group B was a CO2 source during the early and middle periods of the experiment and a CO2 sink at the end of the experiment, with the mean flux during the experiment being 10.95 mg·m-2·h-1. The change trends of CO2 flux in the group F and FB were generally consistent, acting as CO2 sources in the early period and as CO2 sinks subsequently. The mean fluxes of those two groups during the expe-riment were -3.53 and -10.49 mg·m-2·h-1, respectively. Water pH was a good predictor for CO2 flux across the water-air interface according to the result of regression analysis, with pH value of 8.25 as the critical threshold between efflux and influx. The net primary production of water column was the main factor influencing the CO2 flux, indicating that phytoplankton might be the main internal force regulating the CO2 flux across the water-air interface. Our results indicated that C. farreri at present stocking density in the polyculture system could promote phytoplankton biomass as well as primary production and therefore enhance the CO2 sink function.