信阳市大型水库功能演变对水库水质的影响——以南湾水库为例

Effects of Function Changes of the Large Reservoirs in Xinyang of Henan Province on Water Qualities——Using Nanwan Reservoir as An Example

水库水质污染是水库利用过程中比较普遍发生的现象,水库利用过程体现为水库功能及其演变,研究水库功能及其演变与水库水质变化的关系,有助于科学、合理利用水库。信阳市是河南省内大型水库众多的地区之一,南湾水库是该市最大的水库,目前功能最多,在区域社会发展中作用重大。以该水库为例,运用相关分析法,探讨了该水库自1997年以来的水质波动状况与其功能演变之间的关系,发现:旅游经济、养殖业经济发展与水库总氮、总磷、石油类等水质指标之间存在比较显著的正相关关系,表明该水库发展旅游功能、养殖功能存在着环境制约性,对大型水库开发利用必须注意其生态环境承载能力;相关分析是一种将水库水质污染指标与水库污染源实现连接的简捷量化分析方法。

Reservoir pollutions has become common phenomena in the water-body utilization processes embodying the reservoirs＇ functions and their changes, thus study on relations of the reservoir water qualities with its functions will make sure the scientific utilization. In Henan Province, Xinyang is one of the areas holding the most reservoirs in which Nanwan Reservoir is the greatest and has developed the most functions that has played a key role in facilitating the regionally social progresses at present. Using Nanwan Reservoir as an example and the method of correlation analysis, this paper discussed the relations of water quality fluctuation of the reservoir with its functions＇ changes from 1997 to 2006, the results have shown that there are markedly positive correlations between annually average total nitrogen, total phosphorus, oil amount and tourism income as well as fish output of it, which indicated there have been environmental limits for development of its tourism and fish cultivation functions, thereby the utili- zation on a large reservoir should be based on its environmental capacities. At the same time,the method of correla- tion analysis has been successfully used to numerically depict relations of the major water pollution indices for Nan- wan Reservoir with its pollution sources.