期刊论文

中文

生态环境学报

1674-5906

2007

16

3

994-999

10.16258/j.cnki.1674-5906.2007.03.057

国家“十五”重大科技攻关项目（2004BA520A01） 湖南农业大学稳定人才基金项目（WD0612）

本校为其他机构

通过野外调查取样、室内培养试验与分析测定,研究了湖南省几种母质发育的旱地土壤和稻田土壤固定态铵释放的动力学.结果表明,供试土壤固定态铵的释放非常缓慢.水田土壤培养8周后,旱地土壤培养7周后均未达到最大释放量,其累积释放量随着时间的延长而增加;除开始2 d内固定态铵的释放稍快外,整个培养期间土壤固定态铵的释放速率基本保持恒定.其中,土壤"新固定的"固定态铵的释放率远远大于"原有的"固定态铵.在水田土壤条件下,"新固定的"固定态铵经培养8周后,可释放出"新固定的"固定态铵的58.0%～80.8%,而"原有的"固定态铵仅能释放2.4%～8.8%.数学拟合结果表明,一级动力学方程和抛物扩散方程均能很好...

The kinetics of release of fixed ammonium from several types of cultivated upland soils and paddy soils derived from chief parent materials in Hunan province, China, were studied with sampling on fields, and laboratory incubation and determination. The obtained results showed that release of fixed ammonium in the tested soils increased with the incubation time, and the rate of fixed-NH4^＋ release was very slow. Release of fixed ammonium still continued at the reaction time of 8 weeks for the paddy soils and of 7weeks for the upland soils and h...