Tong Yong, Lin Guofang, Ke Xin, Liu Fuping, Zhu Guangwei, Gao Guang, Shen Jianhua
Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
Chemosphere. 2005 Jun;60(1):85-92. doi: 10.1016/j.chemosphere.2005.01.037. Epub 2005 Feb 26.
In order to investigate the role of the microbial community in aquatic ecology and nutrient transformations in the development of eutrophication in large shallow freshwater lakes along Yangtze River, the microbial community in the depth-related sediment in Lake Chaohu and Lake Longganhu were compared. Lake Chaohu is one of the three most polluted lakes in China. However, the neighboring Lake Longganhu, a mesotrophic lake, is relatively pristine. The total phosphorous (TP) and total nitrogen (TN) concentration in water was detected at 0.193 mgl(-1) and 3.035 mgl(-1) for Lake Chaohu, 0.051 mgl(-1) and 0.774 mgl(-1) for Lake Longganhu, respectively. The population of the microorganisms with various ecological nutrient transforming functions (e.g. phosphate solubilizing, denitrifying and cellulose decomposing) and a batch of environmental parameters concerning the nutrient accumulating and transforming (e.g. total organic carbon, total nitrogen, and total phosphorous concentrations) were assayed in the depth-related sediment samples from several defined points in both lakes. The sediment samples from Lake Chaohu showed higher density of actinomycetes (P<0.05) and phosphate-solubilizing bacteria (P<0.001) and less profusion of denitrifying bacteria (P<0.05) and cellulolytic microbes (P<0.001), compared with those of Lake Longganhu. The data suggested that the current microbial community in the sediment of Lake Chaohu is in favor of sustaining or further accelerating the process of the lake eutrophication. A possible positive feedback loop which consists of sustained growth of microorganisms and gradual decline of lake eutrophic status is worth further discussing.
为了研究长江沿岸大型浅水淡水湖泊富营养化发展过程中微生物群落对水生生态和养分转化的作用，对巢湖和龙感湖与深度相关的沉积物中的微生物群落进行了比较。巢湖是中国污染最严重的三个湖泊之一。然而，邻近的中营养湖泊龙感湖相对较为原始。巢湖水体中的总磷（TP）和总氮（TN）浓度分别检测为0.193mg/L和3.035mg/L，龙感湖则分别为0.051mg/L和0.774mg/L。在两个湖泊中几个特定点采集的与深度相关的沉积物样本中，测定了具有各种生态养分转化功能（如解磷、反硝化和纤维素分解）的微生物数量以及一批与养分积累和转化有关的环境参数（如总有机碳、总氮和总磷浓度）。与龙感湖相比，巢湖的沉积物样本显示放线菌密度更高（P<0.05）和解磷细菌更多（P<0.001），而反硝化细菌（P<0.05）和纤维素分解微生物较少（P<0.001）。数据表明，巢湖沉积物中当前的微生物群落有利于维持或进一步加速湖泊富营养化进程。由微生物持续生长和湖泊富营养状态逐渐下降组成的一个可能的正反馈回路值得进一步探讨。
