某水库营养盐动态变化规律及影响因素分析

Analysis of nutrient dynamic change rule and influence factors In H reservoir

为了探明水库营养盐动态变化规律及影响因素，针对西安市某水库于2012年7月-2013年6月对水温、溶解氧、氮磷营养盐等水质因子进行连续监测，结果表明：该水库水体氮磷营养盐具有明显的季节性变化特征；春冬季节总氮、总磷含量相对较低，平均浓度为1.107 mg·L-1、0.018 mg·L-1；夏秋季节总氮、总磷含量相对较高，平均浓度为1.406 mg·L-1、0.079 mg·L-1；汛期由于大量含氮磷的泥土、腐殖质及污染物随暴雨径流进入水库，导致水库水体总氮、总磷一度高达1.889 mg·L-1、0.160 mg·L-1；水体季节性分层后底层水体逐渐达到厌氧状态，从而使得沉积物中氮磷释放进入水体，导致水体分层期间下层水体总氮、总磷含量分别高达1.647 mg·L-1、0.671 mg·L-1；扬水曝气原位水质改善系统的有效运行能够解决深水层缺氧造成的内源污染问题[1]．

In order to ascertain the nutrient dynamic change rule and influence factors of Xi＇an H reservoir, a continuous monitoring is carried out on the water temperature, dissolved oxygen, nitrogen and phosphorus nutrient and other water quality factors from July 2012 to June 2013,The experimental results showed that nitrogen and phosphorus Had obvious seasonal variation characteristics;Total nitrogen, total phosphorus content in the spring and winter was relatively low, with the average concentration being 1.107 mg？L-1, 0.018 mg？L-1;In summer and fall season total nitrogen, total phosphorus content was relatively High, of 1.406 mg？L-1, 0.079 mg？L-1;rainstorm runoff containing nitrogen and phosphorus in the soil, Humus and pollutants ran into the reservoir in case of Heavy rains, the reservoir water, total nitrogen, total phosphorus increased to 1.889 mg？L-1, 0.160 mg？L-1; the bottom water gradually achieved the anaerobic state after seasonal water stratification, nitrogen and phosphorus in the sediment released into water bodies under the conditions of anaerobic, causing the lower water content of total nitrogen, phosphorus, respectively to be 1.647 mg？L-1, 0.671 mg？L-1 during water stratification. Effective operation of pumping water quality improvement in situ aeration system can solve the problem of deep water source pollution caused by Hypoxia.