人工鱼礁投放对莱州金城海域沉积环境地球化学要素的影响

The impact of artificial reef on geochemical factors of sediment in Jincheng area of Laizhou Bay

2009年7月和2010～2011年春、夏、秋、冬4个季节共9个航次对莱州金城人工鱼礁区域和对照区域的沉积环境进行调查，并对投礁前后沉积物粒径、总氮（TN）、总磷（TP）、有机碳（TOC）和硫化物等指标的变化进行分析。结果表明，投礁后沉积物类型没有发生改变，但沉积物粒径有所增加。2009年7月，沉积物中值粒径和平均粒径均值分别为（0．156±0．084）mm和（O．157±0．076）mm，投礁后的2010年7月，沉积物中值粒径和平均粒径均值分别为（0．160±0．079）mm和（0．162±0．092mm），且礁区沉积物中值粒径和平均粒径要高于对照区。2009～2011年7月，沉积物中其他指标变化趋势为：投礁区TN、TOc和硫化物平均含量均表现为逐年降低，TP为先升高后降低；对照区TN和TOC平均含量为先降低后升高，而TP和硫化物平均含量变化表现为逐年升高。2010年和2011年各指标的变化趋势为：礁区除TP平均含量为2011年高于2010年外，其余3项指标均为2010年高于2011年，而对照区除TOC平均含量2010年高于2011年外，其余3种指标均为2011年高于2010年；TP和硫化物平均含量为礁区高于对照区，而TN和TOC则为对照区高于礁区。

Sediment samples in the artificial reef of Laizhou Bay were collected in March , May, July and November from 2010 to 2012. Sediment grain size, total nitrogen （TN）, totalphosphorus （TP）, total organic carbon （TOC） and sulfides were determined,and their varia tions were analyzed. The results showed that the type of sediment did not change, but there was an increase in the sediment grain size, with the medium diameter and the average particle diameter changing from （0. 156±0. 084） mm and （0. 157±0. 076） mm in July 2009 to （0. 160± 0. 079） mm and （0. 162±0. 092） mm in July 2010. The medium diameter and the average parti cle diameter of the sediment samples in the artificial reef area were higher than those in the con trol area. The other elements in sediments in the artificial reef area in July from 2009 to 2011 had such a trend, the average content of TN, TOC and sulfides had the highest content in 2009, and the lowest content in 2011, the average content of TP had the highest content in 2010, and the lowest content in 2009; while in the control area, the average content of TN and TOC decreased in 2010 and then increased in 2011 ,and the average contents of TP and sulfides had an increasing trend from 2009 to 2011. The average content of TP in the artificial reef area was higher in 2011 than 2010, and the contents of other elements were higher in 2010 than 2011. In the control area, the average content of TOC was higher in 2010 than 2011, and the average contents of other elements were higher in 2011 than 2010; the average contents of TP and sulfides were higher in the artificial reef area than those in the control area, while the aver age contents of TN and TOC had an opposite variation trend in the control area.