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2008年4月和7月于黄河三角洲南部潮间带进行了大面站调查,采用DAPI荧光染色荧光显微镜计数法测定了沉积物中异养细菌数量,研究其分布特征,探讨满足其生长繁殖需要的物质来源。结果表明,春季和夏季潮间带沉积物中异养细菌丰度的变化范围分别为4.0~31.9×105cells/g dw(平均值为11.81×105cells/g dw)和5.9~53.5×105cells/g dw(平均值为17.80×105cells/g dw)。与世界其它地区相比,本调查区域沉积物中异养细菌丰度处于较低水平,这可能与该区域沉积物中POC含量较低有关(春季平均为0.10%,夏季平均为0.57%)。春季和夏季沉积物中BB∶PB(Bacteria Biomass,BB;Phytoplankton Biomass,PB)值的变化范围分别为0.02~0.89%(平均为0.26%)和0.09~3.38%(平均为0.55%),都处于较低水平(<5%);该较低水平表明底栖藻类现存量远远超过了异养细菌生长的需求。春季和夏季潮间带沉积物中异养细菌丰度和叶绿素浓度的相关系数均为0.24,显示出不显著相关,说明藻类有机物不是异养细菌食物的主要来源。本研究区域有多条河流输入,沉积物中的异养细菌生长繁殖所需的溶解有机物可能有相当一部分来自陆源径流。
In April and July 2008, a survey was conducted in the intertidal zone in the southern part of the Yellow River Delta. The number of heterotrophic bacteria in the sediment was determined by DAPI fluorescence microscopy and the distribution characteristics of the bacteria were studied, and their growth and reproduction were discussed The material source. The results showed that the abundance of heterotrophic bacteria in the sediments of spring and summer intertidal zones varied from 4.0 to 31.9 × 105cells / g dw (average of 11.81 × 105cells / g dw) and from 5.9 to 53.5 × 105cells / g dw (Average of 17.80 × 10 5 cells / g dw). Compared with other parts of the world, the abundance of heterotrophic bacteria in the sediments in the survey area is relatively low, which may be related to the low POC content in the sediments in the study area (average of 0.10% in spring and 0.57% in summer). The values of BB: PB (Bacteria Biomass, PB) in spring and summer sediments varied from 0.02% to 0.89% (average 0.26%) and 0.09% to 3.38% (average 0.55%), respectively, Lower levels (<5%); this lower level indicates that benthic algae stocks far exceed the needs of heterotrophic bacteria growth. The correlation coefficients of heterotrophic and chlorophyll concentrations in sediments of spring and summer intertidal zone were 0.24, showing no significant correlation, indicating that algae organic matter is not the main source of heterotrophic bacteria food. In the study area, there are multiple river inputs, and a significant portion of the dissolved organic matter needed for heterotrophic bacterial growth and sedimentation in sediments may come from land-sourced runoff.