摘要
研究了长江中下游浅水湖泊沉积物总氮、可交换态氮与固定态铵的赋存特征.结果表明:①14个沉积物的总氮(TN)含量为768.5～5190.6mg.kg-1之间,以月湖沉积物TN含量最高,是其它各湖泊沉积物TN含量的2～7倍;可交换态氮(EN)含量为150.92～341.98mg.kg-1,占TN的6.29%～19.64%;固定态铵(F-NH4)含量变化在186.5～462.5mg.kg-1,占TN的8.40%～35.02%.②EN以NH4+-N为主,NO3--N其次,NO2--N最低,分别占EN的74.61%～85.85%、13.93%～25.15%和0.17%～0.27%.③EN、NH4+-N、NO3--N及NO2--N之间在α=0.01时互为显著正相关,F-NH4与EN、NH4+-N在α=0.05时显著正相关,而与NO3--N、NO2--N不相关.④在α=0.01或α=0.05时,EN、NH4+-N、NO3--N、NO2--N和F-NH4分别与总氮(TN)、总磷(TP)、有机碳(TOC)、阳离子代换量(CEC)、粉沙粒(Silt)及粘粒(Clay)含量有显著正相关关系,与粗砂粒(Sand)含量有显著负相关关系.除此之外,F-NH4与CaO、Fe2O3和Al2O3均有显著正相关关系.
Distribution of total nitrogen （TN）, exchangeable nitrogen （EN） and fixed ammonium （F-NH4 ） and their functions in recycling in sediments from shallow lakes in the middle and lower reaches of the Yangtze River were investigated. The results indicated that ： ①Contents of TN, EN and F-NH4 of 14 lake sediment samples of the studied region were 768.5-5190.6 mg·kg^-1,150.92 -341.98 mg·kg^-1 and 186.5 -462.5 mg·kg^-1 respectively. ②Exchangeable nitrogen, NH4^＋-N, NO3^--N and NO2^-N were 150.92 -341.98mg·kg^-1, 145.2 -269.4 mg·kg^-1, 30.3 -71.8 mg·kg^-1, and0.32-0.78 mg·kg^-1, accounting for74.61% -85.85%, 13.93% -25.15% and 0.17% -0.27% of total exchangeable-Nitrogen, respectively. ③Exchangeable NH4^＋ -N, NO3^-N and NO2^- -N have remarkable positive correlations among them. There is a strong positive correlation between exchangeable ammonium and fixed ammonium. ④The exchangeable and fixed nitrogen have strong positive correlations with the contents of TN, TP, TOC, CEC, silt and clay of the studied samples, but have strong negative correlations with sand content. In addition, there are positive correlations between the contents of CaO, Fe2 03 and A12 03 and fixed ammonium.
出处
《环境科学学报》
CAS
CSCD
北大核心
2008年第1期37-43,共7页
Acta Scientiae Circumstantiae
基金
国家重点基础计划(973)项目(No.2002CB412304)
中日合作太湖水环境修复示范项目~~
关键词
湖泊沉积物
总氮
可交换态氮
固定态铵
lake sediment
total nitrogen
exchangeable-Nitrogen
fixed ammonium
