钦州湾近20a来水环境指标的变化趋势Ⅶ：水温、盐度和pH的量值变化及其对生态环境的影响

Change trend of water environment indices in Qinzhou Bay in 20 years Ⅶ:Quantitative change of water temperature,salinity and pH and effect of entironment

根据钦州湾1983～2003年间12个航次水温、盐度和pH的调查资料，从其演化趋势及其与环境因子之间的关系人手展开分析研究。结果表明：该湾盐度具有随时间变化而下降的演化趋势，水温则多以上升趋势、pH则多以下降趋势出现；相关分析显示，盐度与环境因子之间出现相关性的几率最多，而水温和pH出现的几率只有盐度的一半，但均以与Si的相关性最为显著，N次之，而P则均无相关性出现。从不同时期水温、盐度和pH与环境因子之间关系的变化情况看，物理输运作用对海湾生态环境的影响正在逐步减弱，而生物作用的影响已呈现出上升势头，对海湾生态环境的可持续发展极为有利。

According to the research statistics on the water temperature, salinity and pH in Qinzhou bay in 12 voyages during 1983 to 2003, the quantitative changes from the relationship between variation trend and environment factors were analyzed. The results shows that the salinity was falling with time, the water temperature was up and pH mostly was down. The correlation analysis shows that the most rate of the dependence was between the salinity and environment factors while the rate of the water temperature and pH was only half to the salinity. But Si was the most remarkable. N is second place while there was not dependence with P. From the variety of relationships between the environment factors with the temperature in different periods, salinity and pH, it can be seen the effect of transportation by physics to the environment is getting lower while the effect of biologic reaction is up, which is very good for the sustainable development in bay＇s ecological environment.