【作者】 刘芳； 樊小林； 李天安； 汪强；

【Author】 LIU Fang,FAN Xiao-lin,LI Tian’an,WANG Qiang(Fertilizer Science and Balanced Fertilization Research Lab, SCAU, Guangzhou 510642,China;Shenzhen Ruyin Ecological Environment Construction Co. , Ltd.,Shenzhen 518057,China)

【机构】 华南农业大学资源环境学院肥料与平衡施肥研究室；

【摘要】 田间试验结果表明,水稻旱种后,耕层0～20 cm土壤的无机氮(NH4+-N和NO3--N)略低于常规稻田的含量,20～40 cm土层略高于常规稻田,40～60cm层次两者没有差异。随着生育期的延长,早种稻田无机氮中的硝态氮含量显著增加并大于常规稻田的含量,但土壤中的无机氮始终以铵态氮为主。旱种水稻稻田铵态氮和硝态氮均随土壤深度而递减;常规稻田土壤铵态氮随深度递减,而硝态氮含量随深度递增。各层土壤无机氮总量的变化趋势和规律与土壤无机氮含量相同。常规稻田无机氮主要分布在0～20 cm土层,旱种稻田则主要分布在0～40 cm土层。更多还原

【Abstract】 Field experiments were conducted in 2002.The results shown that the inorganic N (NO3--N and NH4+-N) in 0 - 20 cm top layer of soil in GCRPS treatments was a little lower than that of paddy control treatment, in 20 - 40 cm layer of soil a little higher, in 40 - 60 cm layer no difference. NO3--N of the soil inorganic N in GCRPS treatments significantly increased with growth stage and was higher than that in paddy control treatment, However NH4+ -N was primary inorganic N in both paddy control treatment and GCRPS treatments. NOf -N and NH4+ -N of GCRPS treatments reduced with soil depth. While NH4+ -N of paddy control treatment reduced with soil depth, but NO3- -N increased with soil depth. Total amount of inorganic N in every soil layer had the same dynamics and regularity with inorganic N concentration. The inorganic N of paddy field was concentrated on 0 - 20 cm soil layer, however that of rice upland on 0 - 40 cm soil layer.更多还原