不同实验规模下底栖藻垫的磷含量变化及其形态组成  

Variation of phosphorus content and composition of benthic algae mat in the mesocosms experiment

作　　者：何月[1] 顾新跃 曹金象[1] 裴国凤[1] 

机构地区：[1]中南民族大学生命科学学院,武汉430074

出　　处：《应用与环境生物学报》2014年第3期523-528,共6页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(30970550);中央专项(CZW14003)资助~~

摘　　要：底栖藻类的磷滞留作用是影响浅水富营养化湖泊磷循环的重要因素,为了探究浅水湖泊沿岸带不同规模围隔中底栖藻类滞留磷的潜力及磷的组成形态,应用连续提取法测定了东湖不同围隔及大湖水体(对照)中底栖藻垫的磷含量及其赋存形态.试验期间(一年),所有样点底栖藻垫的无机磷占总磷的百分比例(质量分数)均大于60%,是底栖藻垫中磷的主要存在形态;而无机磷主要由钙磷和铁/铝磷组成,其中围隔底栖藻垫的钙磷含量比对照高,但铁/铝磷含量低于对照.各样点藻垫有机磷占总磷的百分比例相对较低.各样点底栖藻垫的总磷浓度均在秋季达到最高,大于5 200μg/g(DW),不同季节之间没有显著差异,对照底栖藻垫的总磷浓度均值(4 983μg/g,DW)高于大、小围隔.综合分析表明,围隔中底栖藻垫滞留的磷及其赋存形态更有利于浅水高营养化湖泊沉水植物的恢复.The role of periphyton in phosphorus retention is an important factor in phosphorus cycling of shallow lakes. We conducted the study to explore the phosphorus retention capacity and composition of benthic algae mat in the shallow lakes using a sequential extraction in the mesocosms and the control water body in the East Lake. During the monitoring period of one year, phosphorus of benthic algae mat was retained both in organic and inorganic forms. Inorganic phosphorus （IP） of benthic algae mat accounted for more than 60% of total phosphorus （TP） in all sampling sites, which indicated that IP dominated the TP. Most inorganic phosphorus compounds in benthic algae mat fell into two forms： those containing calcium （Ca-P） and those containing iron and aluminum （Fe/Al-P）. The Ca-P content of benthic algae mat was higher in the mesocosms, and lower in the control lake water outside the mesocosms. Much higher Fe/Al-P content of benthic algae mat was observed in the control than in the mesocosms. The organic phosphorus mass ratio of benthic algae mat was relatively low at the three sampling sites. The maximum TP content of benthic algae mat occurred at all sampling sites in the autumn, with values all higher than 5 200 μg/g （DW）. However, there were no significant differences of the TP contents between different seasons. On the average, the TP content of benthic algae mat was the largest in the control （4 983 μg/g DW）, and lower in the mesocosms. The phosphorus contents and forms of benthic algae mat in the mesocosms were more beneficial to the restoration of submerged macrophytes in shallow eutrophic lakes.

关 键 词：围隔 底栖藻垫 磷含量 磷形态组成 东湖 

分 类 号：X524[环境科学与工程—环境工程]