中国岩溶2011，Vol.30Issue(1)：9-15,7.
喀斯特山区溪流上覆水-孔隙水-沉积物中不同形态氮的赋存特征及其迁移——以麦西河为例
Distribution and migration of different forms of nitrogen among overlying water, pore water and sediments in karst mountain stream——A case in the Maixi River
摘要
Abstract
Distribution and migration of nitrogen among overlying water,pore water and sediments are investigated in the Maixi River,the results indicate that in overlying water,the content of different forms of nitrogen assumes an order NO3--N (tric nitrogen) ＞ NH4+-N (ammonicacal nitrogen) ＞ NO2--N ( trite nitrogen);while the content of dissolved inorganic nitrogen(DIN) in pore water assumes an order NH4+-N＞NO3--N＞NO2--N.Content of total nitrogen and fixed ammonium (F-NH4) is 1 110.67～4 413.16mg/kg and 34.56～170.05mg/kg in sediments, accounting for 1.47 ％～6.25 ％ of total nitrogen ; the content of different forms of exchangeable nitrogen in sediments assumes an order NH4+-N＞NO3--N＞NO2--N.Content of NH4+-N in pore water is 2.65～19.51 times higher than that in overlying water, and content of NO3--N in overlying water is 7.14～20.43 times higher than that in pore water.TN in sediments has significant positive correlations with the content of DIN, NH4+-N in pore water, exchangeable nitrogen and exchangeable NH4+-N in sediments ;in sediments, exchangeable NO3--N has significant positive correlations with the content of exchangeable NH4+-N and exchangeable nitrogen, and exchangeable NH4+-N has significant positive correlations with the content of exchangeable nitrogen.DIN in pore water has significant positive correlations with the content of NH4+-N in pore water.Migration of nitrogen in the Maxi River is shown as follows: with a concentration gradient,NO3--N in overlying water is diffuse into pore water, finally accumulated in sediments, while the exchangeable NH4+-N in sediments is released into the pore water and further into the overlying water.关键词
喀斯特/氮形态/赋存特征/迁移/上覆水/孔隙水/沉积物/麦西河Key words
karst / nitrogen forms/ distribution characteristic/ migration/ overlying water/ pore water / sediment/ Maixi River分类
资源环境引用本文复制引用
谢伟芳,夏品华,林陶,张邦喜,詹金星,胡继伟..喀斯特山区溪流上覆水-孔隙水-沉积物中不同形态氮的赋存特征及其迁移——以麦西河为例[J].中国岩溶,2011,30(1):9-15,7.基金项目
贵阳市社会发展攻关项目(2009304)、贵州省科技厅社发攻关项目(SY[2010]3176) （2009304）
