春季南四湖表层沉积物中生物硅的分布及其影响因素  

Study on the distribution and influencing factors of biogenic silica in surface sediments of Nansi Lake in spring

作　　者：曹起孟 刘涛 张菊 张怀珍[1] 邓焕广 杨丽伟 CAO Qimeng;LIU Tao;ZHANG Ju;ZHANG Huaizhen;DENG Huanguang;YANG Liwei(School of Geography and Environment,Liaocheng University,Liaocheng,252000,China;School of Geography,Geomatics and Planning,Jiangsu Normal University,Xuzhou,221116,China)

机构地区：[1]聊城大学地理与环境学院,聊城252000 [2]江苏师范大学地理测绘与城乡规划学院,徐州221116

出　　处：《环境化学》2022年第7期2299-2308,共10页Environmental Chemistry

基　　金：国家自然科学基金(41807430);聊城大学校基金(318011909,318012019)资助。

摘　　要：为研究春季南四湖表层沉积物中生物硅(biogenic silica,BSi)的含量、分布特征及其影响因素,于2019年4月在全湖采集了62个点位的表层沉积物样品和表层水样品,通过对沉积物BSi以及沉积物和表层水理化指标的测定,探讨了南四湖BSi含量水平、分布特征及其影响因素。结果表明,南四湖表层沉积物中BSi含量在0.39%—1.11%之间,平均为0.65%±0.20%,表现为昭阳湖>独山湖>南阳湖>微山湖,昭阳湖(0.82%±0.16%)显著高于微山湖(0.59%±0.19%)(P<0.05);空间分布上微山湖表现为从西北向东南递减的趋势,其他3个湖区则呈东南向西北逐渐递减的趋势。沉积物OC/BSi值介于0.84—13.76之间,平均为7.26,大于Redfield比值(6.63)。南四湖BSi与沉积物OC、TP(s)、AP、TN(s)、AN均呈极显著正相关关系(P<0.01),与表层水SD和NO_(2)−-N分别呈显著正相关和负相关关系(P<0.05);AN、DO和NO_(2)−-N能解释南四湖表层沉积物BSi含量变异程度的47.5%。In order to study the content,distribution characteristics and influencing factors of biogenic silica(BSi)in the surface sediments of Nansi Lake in spring,surface sediment and surface water samples were collected at 62 sampling sites around the lake in April 2019.The content of BSi in sediment and the physicochemical properties of sediment and surface water were determined,and the BSi levels and spatial distribution characteristics as well as its influencing factors were discussed.The results showed that the BSi content in the surface sediments of Nansi Lake ranged from 0.39%to 1.11%with an average value of 0.65%±0.20%.The average BSi content in the four sub-lakes decreased in the order of Zhaoyang Lake>Dushan Lake>Nanyang Lake>Weishan Lake,and the average BSi content(0.82%±0.16%)in Zhaoyang Lake was significantly higher than that(0.59%±0.19%)in Weishan Lake(P<0.05).In terms of spatial distribution,the BSi content in Weishan Lake showed a decreasing trend from northwest to southeast,while the change trend in the other three sub-lakes was on the contrary.The sediment OC/BSi values were between 0.84 and 13.76 with an average of 7.26,which was greater than the Redfield ratio(OC/BSi=6.63).The BSi content in Nansi Lake was significantly positively correlated with the OC,TP,AP,TN and AN content in sediment(P<0.01),but only had a significant positive correlation with SD and negative correlation with NO_(2)−-N in surface water(P<0.05).The multivariate regression analysis indicated that AN,DO and NO_(2)−-N could explain 47.5%of the variation of the BSi content in the surface sediments of Nansi Lake.

关 键 词：生物硅 表层沉积物 空间分布 影响因素 南四湖 

分 类 号：X524[环境科学与工程—环境工程]