巢湖十五里河沉积物生物有效性氮磷分布及相关性  

Distribution and Correlation Analysis of Bio-Available Nitrogen and Phosphorus in Sediments of Shiwuli River,Chaohu Lake

作　　者：李如忠[1] 李峰[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《环境科学研究》2011年第8期873-881,共9页Research of Environmental Sciences

基　　金：安徽省科技攻关计划重点项目(07010302165)

摘　　要：在巢湖十五里河采集15个沉积物柱样,对表层(0～10 cm)沉积物生物有效性氮、磷含量和空间分布特征及相互关系进行研究.结果表明,十五里河表层沉积物的各形态〔IEF(离子交换态),WAEF(弱酸可提取态),SAEF(强碱可提取态)和SOEF(强氧化剂可提取态)〕生物有效性氮、磷含量存在较为明显的空间变化性.w(生物有效性氮)占w(TN)的53.4%～67.9%,且w(SOEF-N)>w(IEF-N)>w(SAEF-N)>w(WAEF-N),其中w(SOEF-N)为411.35～965.47mgkg,占w(TN)的33.4%～43.7%;w(生物有效性磷)占w(TP)的47.3%～89.4%,且w(SAEF-P)>w(SOEF-P)>w(WAEF-P)>w(IEF-P),其中w(SAEF-P)为311.74～960.33 mgkg,占w(TP)的33.0%～78.0%.不同形态生物有效性氮的相关性较差,其中w(IEF-N)与w(WAEF-N)和w(SAEF-N)呈负相关,相关系数分别为-0.042和-0.122;w(WAEF-N)和w(SAEF-N)和w(SOEF-N)的相关系数仅为0.320～0.513.生物有效性磷的相关性相对较强,其中w(IEF-P)与w(WAEF-P)呈显著正相关,相关系数为0.527,w(WAEF-P)与w(SAEF-P)呈极显著正相关,相关系数为0.653.不同形态生物有效性氮、磷的相关性不显著.Fifteen sediment cores were sampled from the representative reaches of the Shiwuli River,Chaohu Lake,and analyzed in order to study the content levels,spatial distribution characteristics and correlation of bio-available nitrogen and phosphorus in the surface sediments（0-10 cm）.The results showed that there was significant spatial variability of the content levels of various forms（IEF,WAEF,SAEF and SOEF） of bio-available nitrogen and phosphorus among the fifteen sampling sites.Generally,the four bio-available nitrogen forms comprised 53.4% to 67.9% of the total nitrogen（TN）,and the content levels followed the sequence： w（SOEF-N）w（IEF-N）w（SAEF-N）w（WAEF-N）,of which the w（SOEF-N） was 411.35-965.47 mg kg with a proportion of 33.4%-43.7%.The four bio-available phosphorus forms comprised 47.3% to 89.4% of the total phosphorus（TP）,and the content levels followed the sequence：w（SAEF-P）w（SOEF-P）w（WAEF-P）w（IEF-P）,of which the w（SAEF-P） was 311.74-960.33 mg kg with a proportion of 33.0%-78.0%.There was weak correlation between the four bio-available nitrogen forms.Meanwhile,w（IEF-N） had negative correlations with w（WAEF-N） and w（SAEF-N）,with correlation coefficients of-0.042 and-0.122,respectively.The correlation coefficients between w（WAEF-N）,w（SAEF-N） and w（SOEF-N） varied from 0.32 to 0.513.However,notable correlations could be found for the bio-available phosphorus forms.In particular,there was significant and positive correlation between w（IEF-P） and w（WAEF-P）,with correlation coefficient of 0.527,and highly significant correlation between w（WAEF-P） and w（SAEF-P）,with correlation coefficient of 0.653.Generally,no significant correlations could be found between the four bio-available nitrogen and bio-available phosphorus forms in the sediments of Shiwuli River,Chaohu Lake.

关 键 词：生物有效性氮 生物有效性磷 沉积物 十五里河 巢湖 

分 类 号：X524[环境科学与工程—环境工程]