Nitrogen mineralization under saline conditions
Nitrogen mineralization under saline conditions
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DOI：
10.1081/css-200059116
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Yamasaki, N
中科院分区：
文献类型：
--
作者：
Irshad, M;Honna, T;Yamasaki, N
土壤氮（N）从有机形式转化为无机形式已成为多项研究的主题，但盐渍土中氮矿化的信息很少。因此，进行这项研究是为了观察用粪肥和尿素改良的盐渍土中氮矿化的趋势。盐渍土的电导率(ECe)分别为0.2(S0)、4.1(S1)和11.4 dSm(-1)(S2)。氮源的施用量为300 kg N ha(-1)，并在25℃下培养8周。氮矿化模式是土壤盐度和氮源的函数。 S0 中释放的 NH4-N 量显着高于 S1 或 S2，特别是在尿素处理的土壤中。 NH4-N释放量顺序为尿素>粪便>对照，在孵化第4周达到释放高峰期。盐度处理减少了 NH4-N 硝化为 NO3-N 的过程。培养过程中NO3-N 的释放模式与NH4-N 相反。尿素处理中总矿化氮最高。施用粪肥使土壤ECe增加18%。
The conversion of soil nitrogen (N) from its organic into inorganic forms has been the subject of several investigations, but information on N mineralization in saline soil is scanty. The study was therefore carried out to observe trends in N mineralization in saline soils amended with manure and urea. The electrical conductivity (ECe) of saline soils was 0.2 (S0), 4.1 (S1), and 11.4 dSm(-1) (S2). The N sources were applied at the rate of 300 kg N ha(-1) and incubated for 8 weeks at 25 degrees C. The pattern of N mineralization was a function of both soil salinity and N sources. The amount of NH4-N released was significantly higher in S0 than S1 or S2, especially in urea treated soils. The NH4-N release varied in the order of urea > manure > control with a peak period of release at the 4th week of incubation. Nitrification of NH4-N to NO3-N was reduced by salinity treatments. Patterns of NO3-N release during incubation were opposite that of NH4-N. Total mineralized N was highest in the urea treatment. Manure application increased ECe of soil by 18%.