摘要
为了探讨环境因子和底栖配养生物对碳通量的影响,采用实验室培养方法,测定并比较了不同混养模式下沉积物-水界面各形态碳的通量,监测了8月沉积物-水界面上覆水中各形态碳含量的昼夜变化。3种主养草鱼池塘的养殖模式为草鱼、鲢和鳙混养（GSB）,草鱼、鲢、鳙和凡纳滨对虾混养（GSBL）,草鱼、鲢、鳙和鲤混养（GSBC）。主要实验结果如下：（1）在养殖周期内,3种混养模式沉积物-水界面可溶性无机碳（DIC）通量范围为0.65~16.90 mg/（m^2·d）,可溶性有机碳（DOC）通量范围为0.16~13.49 mg/（m^2·d）,颗粒性有机碳（POC）通量范围为-2.29~3.32 mg/（m^2·d）;GSB和GSBC模式各形态碳通量均以8月最高,GSBL模式则以7月最高。（2）在养殖周期内,3种混养模式沉积物对DIC和DOC均表现为释放,而对POC在4-6月以吸收为主,其余时间表现为释放。（3）在养殖的中后期,3种混养模式的DIC、DOC和POC通量存在一定差异。其中,GSBL和GSBC模式中各形态碳通量值显著高于GSB模式（P〈0.05）。（4）8月上覆水中DIC和DOC的含量在4：00达到最大值,POC含量则表现为GSBL模式在4：00达到最大值,12：00达到最小值,而GSBC模式在4：00达到最小值,12：00达到最大值。（5）各形态碳通量的变化与上覆水中的DO、p H呈显著负相关关系,而与水温呈显著正相关关系。
To investigate the seasonal variance of carbonic exchange in different grass carp ponds and explore the relationship betw een carbonic fluxes and environment factors of overlying water,three poly-culture systems,i. e.（ 1） GSB group： grass carp Ctenopharyngodon idellus,silver carp Hypophthalmictuthys molitrix and big head carp Aristichthys nobilis,（ 2） GSBL group： grass carp,silver carp,big head carp and Litopenaeus vannamei,（ 3） GSBC group： grass carp,silver carp,big head carp and carp Cyprinus carpio,were studied by simulation in the laboratory from April to September,2013. The changes of benthic fluxes of carbon across the sediment-w ater interface with time were studied,as well as the diurnal variation of carbon in the overlying water in August. The results show ed that dissolved inorganic carbons（ DIC） fluxes ranged from 0. 65 mg /（ m^2· d） to 16. 90 mg /（ m^2· d）,while dissolved organic carbons（ DOC） fluxes and particulate organic carbon（ POC） fluxes ranged from 0. 16 mg /（ m^2·d） to 3. 49 mg /（ m^2·d）,- 2. 29 mg /（ m^2·d） to 3. 32 mg /（ m^2·d）,respectively. Different carbon fluxes were all maximum in August for GSB and GSBC groups,but in July for GSBL group. During our experiments,the ex-fluxes of DIC and DOC were observed in every month. POC was up-taken by the sediments from April to June,but released from the sediments in other months. In the mid-to-late cultivation time,the benthic fluxes of DIC,DOC and POC in GSBL and GSBC groups were significantly higher than those in GSB group（ P〈0. 05）. The diurnal variation of carbons had obvious characters in August,with the content of DIC and DOC being maximum at4： 00 am. The content of POC in the GSBL got the maximum value at 4： 00 am and the minimum value at12： 00 am,which was opposite to that of GSBC group. The results demonstrated a significantly negative correlation of carbon fluxes with DO and p H in overlying water,but a significantly positive correlation with overlying water temperature.
出处
《水产学报》
CAS
CSCD
北大核心
2015年第7期1005-1014,共10页
Journal of Fisheries of China
基金
国家"九七三"重点基础研究发展计划(2009CB118706)
山东省自然科学基金(ZR2014CM042)
关键词
主养草鱼池塘
沉积物-水界面
碳通量
上覆水
DO
pH
水温
grass carp poly-culture pond
sediment-water interface
carbon fluxes
overlying water
dissolved oxygen
pH
water temperature
