摘要
采集未破坏沉积物结构的柱状沉积物样品,通过室内41 d的培养实验,研究了沉水植物生长过程对间隙水中NH_4^+-N和PO_4^(3-)-P的浓度的动态影响,分析了沉水植物生物量与沉积物中氮磷释放通量的对应关系．结果表明：随沉水植物生长和生物量增加,上部0-5 cm沉积物垂向各层间隙水中NH_4^+-N含量呈逐步降低,表现出沉积物-水界面氮的释放通量与沉水植物生物量存在负相关性；而间隙水PO_4^(3+)-P含量则随沉水植物生长呈单峰型变化,磷释放通量与生物量相关性不明显．初步反映沉水植物在沉积物的生长过程中对氮磷吸收的生物地球化学机制是不同的．
Effect with growing of submerged macrophytes on NH4^＋-N and PO4^3-Pconcentration in the interstitial water was studied by using undisturbed core samples in Lake Taihu, and analyzed the relationship between biomasses of submerged macrophytes and amount of nitrogen and phosphorus release. The results showed that concentration of NH4^＋-N from 0-5 cm in interstitial water was gradually reduced by the biomasses increase of submerged macrophytes, and amount of nitrogen release is distinctly negative correlated with biomasses of submerged macrophytes; The PO4^3-P concentration in interstitial water change was me peak tendency by the growing of submerged macrophytes,indicating that there was no distinct corlationships between amount of phosphorus release and biomasses of submerged macrophytes, There mingt exisf different biogeochemcal mechanism of the absorption of nitrogen and phosphorus by submerged macrophytes.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2006年第5期515-522,共8页
Journal of Lake Sciences
基金
国家973计划(2002CB412307)
国家高技术研究发展计划863项目(2002AA601013)
中国科学院知识创新项目(KZCX3-SW-348
KZCX1-SW-12)联合资助.
关键词
沉水植物生长
间隙水
氮和磷
释放
生物地球化学
Submerged macrophytes
interstitial water
nitrogen and phosphorus
release
biogeochemistry
