School of Environment, Beijing Normal University Beijing 100875, China.
J Environ Sci (China). 2012;24(4):602-9. doi: 10.1016/s1001-0742(11)60784-5.
Recent sediments from Lake Chenghai, China, were investigated at high temporal resolution to trace both natural and anthropogenic effects on the lake using total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), organic phosphorus (Po), inorganic phosphorus (Pi) and organic carbon and nitrogen stable isotopes (delta13Corg and delta15N) in a 137Cs-dated sediment core. The results indicated that the sedimentary record covers the last 60 years, during which the lake had undergone apparent changes in nutrient sources and productivity in response to nutrient loading. Prior to the late 1980s, the nutrient contents in sediments mainly originated from algae and lake productivity was relatively stable. Since the late 1980s, increasing TOC, TN and TP concentrations together with the change of delta13Corg and delta15N suggested anthropogenic perturbations in nutrient loading and lake productivity. Endogenic nutrients derived from algae and anthropogenic inputs were two important sources of sedimentary nutrients. The anthropogenic nutrients mainly originated from the discharge of industrial wastewater and artificial cultivation of Spirulina after the middle 1980s, and domestic wastewater discharged from Yongsheng County since 1993.
对取自中国程海湖的近代沉积物进行了高时间分辨率的研究，通过在 137Cs 定年的沉积物柱中测定总有机碳（TOC）、总氮（TN）、总磷（TP）、有机磷（Po）、无机磷（Pi）以及有机碳和氮稳定同位素（δ13Corg 和 δ15N），追踪了自然和人为因素对湖泊的影响。结果表明，该沉积记录涵盖了过去 60 年的历史，在此期间，湖泊的养分来源和生产力发生了明显变化，以响应养分负荷。在 20 世纪 80 年代末之前，沉积物中的养分含量主要来自藻类，湖泊生产力相对稳定。自 20 世纪 80 年代末以来，TOC、TN 和 TP 浓度的增加以及 δ13Corg 和 δ15N 的变化表明，在养分负荷和湖泊生产力方面存在人为干扰。藻类产生的内源养分和人为输入是沉积物养分的两个重要来源。人为养分主要来自 20 世纪 80 年代中期以后工业废水的排放和螺旋藻的人工养殖，以及 1993 年以来来自永胜县的生活污水。
