农业环境科学学报2018，Vol.37Issue(4)：766-773,8.DOI:10.11654/jaes.2017-1482
三峡支流消落带表层沉积物氮矿化动力学参数估算
Parameter estimates of sediment nitrogen mineralization kinetics in the water level fluctuation zone of a Three Gorges Reservoir tributary
摘要
Abstract
To reveal the effect of drought-rewetting process on the nitrogen mineralization kinetics in the sediment of the water level fluctu-ation(WLF)zone, surface sediment samples were collected over various water level altitudes at the upper and downstream sections of the Pengxi River.The sediment nitrogen mineralization rate was evaluated with anaerobic incubation.The one-pool,two-pool,special,and effective accumulated temperature models(EATM)were applied to fit the data of nitrogen mineralization kinetics in sediments. The re-sult showed that total organic carbon(C),total nitrogen(N),organic matter(OM),clay,silt,and NH+4-N in the higher altitude were lower than that in the lower altitude,which is on the contrary to total phosphorus,sand,and NO-3-N.The one-pool model and special model were the optimal models for fitting nitrogen mineralization in sediments at low and high altitudes,respectively.The N mineralization rate constants (kd)were 0.17 d-1and 0.12 d-1,while the N mineralization potentials(fd)were 4.05% and 4.71% in the low and high altitude sediments,re-spectively.The fdwas negatively correlated with C,N,C/N ratio,OM,NH+4-N,and silt,and was positively correlated with NO-3-N and sand(P﹤0.05).The kdvalue had an opposite trend compared to the variation in fd.The model parameters of fdand kdwere successfully estimated by using the OM and C/N ratio.The current study revealed that nitrogen mineralization kinetics in sediment had a strong correlation with the water nitrogen content,and could thus be used to predict the contribution of nitrogen input into the WLF zone as an indicator of river eu-trophication.关键词
三峡库区/氮矿化速率/水位波动/氮矿化模型/彭溪河流域Key words
Three Gorges Reservoir area/nitrogen mineralization rate/water level fluctuation/nitrogen mineralization model/Pengxi River basin分类
资源环境引用本文复制引用
刘丹,张帅,唐玉姣,尹静,谭兴伶,陈茜,于志国,林俊杰..三峡支流消落带表层沉积物氮矿化动力学参数估算[J].农业环境科学学报,2018,37(4):766-773,8.基金项目
重庆市教委科学技术研究项目(KJ1733441,KJ1601016) （KJ1733441,KJ1601016）
国家自然科学基金项目(31670467) （31670467）
教育部春晖计划项目(Z2015133) （Z2015133）
万州科技人才专项(2016-1) （2016-1）
三峡库区水环境演变与污染防治重庆高校市级重点实验室开放基金(WEPKL2016ZD-01,WEPKL2016ZZ-01)The Scientific and Technological Research Program of Chongqing Municipal Education Commission(KJ1733441,KJ1601016) （WEPKL2016ZD-01,WEPKL2016ZZ-01）
National Natural Science Foundation of China(31670467) （31670467）
Chunhui Project from Education Ministry of China(Z2015133) （Z2015133）
Talent Project of Wanzhou,China(2016-1) （2016-1）
Chongqing Municipal Key Laboratory of Institutions of Higher Education(WEPKL2016ZD-01,WEPKL2016ZZ-01) （WEPKL2016ZD-01,WEPKL2016ZZ-01）
