水土保持学报2017，Vol.31Issue(2)：279-286,292,9.DOI:10.13870/j.cnki.stbcxb.2017.02.046
连环湖敖包泡沉积物磷形态垂向分布特征
Vertical Distribution Characteristics of Phosphorus Fractions in the Sediments from Aobao in Lianhuan Lake
摘要
Abstract
The contents and vertical distribution of phosphorus fractions were analysed comparatively for core sediment samples taken from north sampling site for Core AB1 and south sampling site for Core AB2 of Aohao Lake in Lianhuan Lake using the SMT sequential extraction method.With the dating approach,the evolution characteristics and polluted history of phosphorus and the risk of phosphorus release in lake sediments were discussed.The results showed that the contents and vertical distribution of phosphorus fractions in Core AB1 and Core AB2 varied and the contents of phosphorus fractions in Core AB1 were higher than those in Core AB2,with fluctuated significantly with the depth.During the mid-1940s and 1981,the contents of phosphorus fractions and OM in Core AB1 showed large fluctuations;the contents of Ca-P,IP,and TP in Core AB2 first increased and then decreased,while the contents of Fe/Al-P,OP,and OM were relatively constant.During 1981 to 2009,the contents of Ca-P,IP,and OM changed less and the contents of Fe/Al-P,OP,and TP showed relatively large fluctuations in Core AB1;the contents of Ca-P,Fe/Al-P,and TP first increased and then decreased to different degrees and the contents of IP,OP,and OM tended to increase in Core AB2.The sources of phosphorus in core sediments of Aobao Lake were mainly from industrial wastewater,sewage,and the loss of pesticides and fertilizers.The content of phosphorus in the north of the lake was higher than that in the south,which was closely related with human activity.There were several villages in the northern part of the Aobao Lake but none in the southern part.By using single factor standard index method,the assessment of ecological risk of phosphorus in surface sediments showed that the content of total phosphorus in the northern part of the lake exceeded the standard and showed a certain safety risk.Meanwhile,active phosphorus (Fe/Al-P and OP) in the upper part of the sediment showed a greater increase than that at the bottom of Core AB1,and active phosphorus (Fe/Al-P and OP) were the dominant fractions of the increasing phosphorus sedimentation in Core AB1.It was indicated that phosphorus in the sediment in Aobao Lake would release more easily to the overlying water,and the effect on the eutrophication of lake water should be given attention.关键词
连环湖/沉积物/磷形态/垂向分布Key words
Lianhuan Lake/sediments/phosphorus fractions/vertical distribution分类
资源环境引用本文复制引用
曹微微,肖海丰,臧淑英..连环湖敖包泡沉积物磷形态垂向分布特征[J].水土保持学报,2017,31(2):279-286,292,9.基金项目
国家自然科学基金项目(40972115) （40972115）
国家自然科学基金重点项目(41030743) （41030743）
哈尔滨师范大学预研项目(11XYG-11) （11XYG-11）
