改性当地土壤湖泊综合修复技术对浮游植物群落变动的影响

Effect of modified local soil induced ecological restoration(MLS-IER) technology on variation of phytoplankton community

采用改性当地土壤湖泊综合修复技术从2008年夏季到2010年夏季连续在太湖十八湾围隔内实施夏季应急除藻工程和春季底泥调控工程,通过连续监测浮游植物的群落变动发现:在2009年,春季和夏季工程后浮游植物门类虽在短时间内减少,但是一个月内均又恢复,而且春季工程在短时间内可以在一定程度上抑制蓝藻的种类和比例的增加,又可提高硅藻和绿藻的种类和比例,这对于春季沉水植被的恢复和抑制蓝藻的复苏都有积极意义;从长时间周年变化来看,春季和夏季工程在围隔内连续实施2年,蓝藻水华暴发周期和暴发规模均呈逐渐缩短趋势。这对于进一步开展蓝藻复苏和蓝藻水华暴发的机理研究和控制技术的研究都有一定的指导意义。

From August 2008 to November 2010, field pilot tests of modified local soil induced ecological restoration （MLS-IER） technology were carried out in the trial enclosure in Taihu Lake in every summer for ur- gent algal removal and water quality improvement and in every early spring for sediment remediation and sub- merged vegetation restoration. The variations of phytoplankton community in the trial enclosure were surveyed from October 2008 to November 2010. In 2009, after the pilot tests in March and August, some species were lost in the short run, but recovered about one month later. After the pilot test in March 2009, the variety and the percentage of cyanobacteria declined but that of diatom and green algae increased. In the long run, the outbreak period of cyanobacterial bloom in 2010 was shorter than that in 2008 and 2009. Therefore, the effects of MLS- IER technology on water and sediment improvement and restoration of submerged vegetation might inhibit and de- lay the cyanobacterial recruitment and weaken the cyanobacterial outbreak. The further study on mechanism and control technologies of the cyanobacterial recruitment and outbreak should be carried out.