Du Ping, Liu Jing-Jing, Zeng Jiang-Ning, Chen Quan-Zhen, Jiang Zhi-Bing, Zhu Xu-Yu
Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China.
Ying Yong Sheng Tai Xue Bao. 2011 May;22(5):1316-24.
In August 15-28, 2009, a preliminary study was conducted on the spatial distribution characteristics of heterotrophic bacteria (HB), inorganic phosphate bacteria (IPB), organic phosphate bacteria (OPB), denitrifying bacteria (DB), and ammonifying bacteria (AB) in the hypoxic zone of Yangtze River Estuary. In the water surface, water bottom, and sediment surface of the zone, the average quantity of AB was the largest, being 307.52 x 10(4) cells x L(-1), 184.50 x 10(4) cells x L(-1), 199.97 x 10(2) cells x g(-1), followed by that of HB (87.35 x 10(4) cfu x L(-1), 86.85 x 10(4) cfu x L(-1), and 19.56 x 10(2) cfu x g(-1)), and of OPB (19.26 x 10(4) cfu x L(-1), 18.82 x 10(4) cfu x L(-1), and 19.56 x10(2) cfu x g(-1), respectively). IPB was only observed within the Yangtze Estuary, south passage of the Estuary, and Zhoushan inshore, and its average quantity in the water surface, water bottom, and sediment surface was 18.50 x 10(4) cfu x L(-1), 31.00 x 10(4) cfu x L(-1), and 7.17 x 10(2) cfu x g(-1) respectively. DB had a wide distribution, but its average quantity was low, being 3.94 x 10(4) cells x L(-1), 23.08 x 10(4) cells x L(-1), and 6.22 x 10(2) cells x g(-1) in the water surface, water bottom, and sediment surface, respectively. Salinity, NO3(-)-N, PO4(3-)-P, SiO3(2)-Si, and pH were the main factors affecting the distribution of HB, IPB, OPB, and DB in water body and sediment surface. The HB, IPB, and OPB in water bottom and sediment surface had significant positive correlation with water temperature; the HB and OPB in water bottom and the IPB in sediment surface were significantly positively correlated with dissolved oxygen (DO); while the AB in sediment surface was significantly negatively correlated with DO. Cluster analysis showed that hypoxia affected the bacterial community structure in sediment surface.
2009年8月15日至28日，对长江河口缺氧区异养细菌（HB）、无机磷细菌（IPB）、有机磷细菌（OPB）、反硝化细菌（DB）和氨化细菌（AB）的空间分布特征进行了初步研究。在该区域的水面、水底和沉积物表面，AB的平均数量最多，分别为307.52×10⁴个细胞×L⁻¹、184.50×10⁴个细胞×L⁻¹、199.97×10²个细胞×g⁻¹，其次是HB（87.35×10⁴cfu×L⁻¹、86.85×10⁴cfu×L⁻¹和19.56×10²cfu×g⁻¹），以及OPB（分别为19.26×10⁴cfu×L⁻¹、18.82×10⁴cfu×L⁻¹和19.56×10²cfu×g⁻¹）。IPB仅在长江河口、河口南槽和舟山近岸被观测到，其在水面、水底和沉积物表面的平均数量分别为18.50×10⁴cfu×L⁻¹、31.00×10⁴cfu×L⁻¹和7.17×10²cfu×g⁻¹。DB分布广泛，但其平均数量较低，在水面、水底和沉积物表面分别为3.94×10⁴个细胞×L⁻¹、23.08×10⁴个细胞×L⁻¹和6.22×10²个细胞×g⁻¹。盐度、NO₃⁻-N、PO₄³⁻-P、SiO₃²⁻-Si和pH是影响水体和沉积物表面HB、IPB、OPB和DB分布的主要因素。水底和沉积物表面的HB、IPB和OPB与水温呈显著正相关；水底的HB和OPB以及沉积物表面的IPB与溶解氧（DO）呈显著正相关；而沉积物表面的AB与DO呈显著负相关。聚类分析表明，缺氧影响了沉积物表面的细菌群落结构。
