标题:
珠江三角洲滨海小流域人工景观湖富营养化评价Eutrophication Status of Artificial Lakes in a Small Coastal Watershed in Pearl River Delta
作者:
熊育久, 王志
关键字:
富营养化, 综合营养状态指数, 浮游藻类, 人工景观湖, 珠海Eutrophication; Comprehensive Trophic Level Index; Phytoplankton; Artificial Lake; Zhuhai
期刊名称:
《Journal of Water Resources Research》, Vol.2 No.6, 2013-12-26
摘要:
在2009年3~7月间，通过对中山大学珠海校区滨海小流域上游河流、下游人工景观湖不同监测样点进行取样分析，根据营养盐、藻类与叶绿素a等指标评价该流域水体的富养化状态，结果表明：1) 上游河流采样点的综合营养状态指数(TLI)均小于40，水体仅处于中营养状态，富营养化的风险小，下游人工景观湖的TLI在50~96之间，均已进入轻度富营养状态甚至重度富营养状态；2) 下游人工景观湖中总氮(TN)浓度在2.96~11.51 mg/L之间，总磷(TP)浓度在0.13~0.67 mg/L之间，均超过湖泊富营养化发生的初始值(TN为0.7 mg/L，TP为0.05 mg/L)；3) 人工景观湖浮游藻类丰度介于1.09 × 106~4.58 × 106个/L之间，大于湖库富营养化发生时的阈值106个/L，且浮游藻类以蓝藻、绿藻为主；4) 人工景观湖中叶绿素a浓度在65~505.23 μg/L之间。Water samples were analyzed for a small coastal watershed in Sun Yat-sen University (Zhuhai) from March to July. Based on the results of total nitrogen (TN), total phosphor (TP), phytoplankton and chlorophyll a, eutrophication status were evaluated. The results showed that: 1) the comprehensive trophic level indexes of upper watershed were less than 40, which suggested the water was meso-eutrophic. The indexes of lower watershed were more than 50, which suggested the water was eutrophic; 2) TN concentration was 2.96 - 11.51 mg/L and TP concentration was 0.13 - 0.67 mg/L in artificial lakes in the lower watershed, which exceeded 0.7 mg/L and 0.05 mg/L respectively, the thresholds of lake eutrophication; 3) the abundance of phytoplankton in the artificial lakes was 1.09 × 106 - 4.58 × 106 cells/L, which is higher than 106 cells/L, the threshold of eutrophication occurring; 4) the chlorophyll a concentration in the artificial lakes was 65 - 505.23 μg/L.