Abstract

Potamogeton crispus has a significant effect on the purification of contaminated water and can improve the stability of aquatic ecosystems, but much research work was carried out under controlled conditions. The water quality indexes were measured to determine whether the purification effect under natural conditions can achieve the same effect as under controlled conditions in this study. The physical and chemical indicators of the water around the P. crispus population were monitored to study the range of impact of P. crispus population during the logarithmic growth period on the water in Xuanwu Lake, Nanjing City. These indicators included pH, secchi disc transparency, turbidity, dissolved oxygen, total nitrogen, ammonia, and total phosphate. The result showed that P. crispus population played an important role in improving lake water quality. P. crispus population increased dissolved oxygen concentration, improved transparency, reduced turbidity, absorbed nutrients from the water column. The transparency, turbidity, and pH value could be affected to 40% of the width of P. crispus population, while dissolved oxygen concentration could be affected to the same width of the population. But the nitrogen and phosphorus concentration could be affected to 10% of the population. In vertical space, the influence of P. crispus population on the surface water was greater than that of the bottom water. According to this study, the gap between P. crispus population can be controlled at 20% of the population width, which can effectively reduce nutrient concentration, improve water transparency and dissolved oxygen content, improve water quality. In the process of ecological restoration with P. crispus population, the width of P. crispus population should be controlled and prevent the spread by regular harvesting, blocking with the net, and so on. The gap between populations should also be determined according to the population width.

中文翻译：

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宣武湖生长期内香茅种群对湖水水质的影响范围

摘要

Potamogeton crispus对污染水的净化具有显著作用，并且可以改善水生生态系统的稳定性，但是在可控的条件下进行了大量研究工作。测量了水质指数，以确定在自然条件下的净化效果是否可以达到本研究中受控条件下的相同效果。监测了香菇种群周围水的理化指标，研究了对数生长期香菇种群对南京市玄武湖水体的影响范围。这些指标包括pH值，圆盘透明度，浊度，溶解氧，总氮，氨和总磷酸盐。结果表明P. crispus种群在改善湖泊水质中起着重要作用。P. crispus种群增加了溶解氧的浓度，提高了透明度，降低了浊度，吸收了水柱中的养分。透明度，浊度和pH值可能会影响到P. crispus种群宽度的40％，而溶解氧浓度可能会影响到相同种群的宽度。但是氮和磷的浓度可能会影响到总人口的10％。在垂直空间中，P。crispus种群对地表水的影响大于对底水的影响。根据这项研究，P。crispus之间的差距种群可控制在种群宽度的20％，可有效降低营养物浓度，提高水的透明度和溶解氧含量，改善水质。在生态恢复与过程菹草人口，宽度菹草人口应控制和防止扩散定期收割，与网阻塞，等等。人口之间的差距也应根据人口宽度确定。