湖南稻田土壤氮素肥力及氮矿化特征-中国农学通报.PDFVIP

中国农学通报 2013,29(12): 109-114 Chinese Agricultural Science Bulletin 湖南省稻田土壤氮素肥力及氮矿化特征 彭银燕，黄运湘，尹力初，孙 梅 （湖南农业大学资源环境学院，长沙410128 ） 摘 要：为探明湖南省稻田土壤氮素肥力及其矿化特征，选择长沙县3 种母质类型发育的3 种稻作制土 壤，采用Waring 和Bremner 淹水密闭2 周培养法（改进法）研究土壤矿化氮量，并预测土壤供氮能力。结 果表明，土壤全氮和碱解氮分别变化于0.60~ 1.50 g/kg 和84.10~ 182.70 mg/kg ，呈正态分布。土壤矿化氮 量的变化范围为24.53~84.61 mg/kg ，与土壤全氮和土壤碱解氮含量之间有显著和极显著的正相关关系 * ** （r=0.492 ，r=0.535 ）。土壤氮矿化势(N )的变化范围为65.70~ 170.09 mg/kg ，矿化速率常数(c)在0.0083~ 0 2 0.0386 之间。土壤供氮量为112.51~422.10 kg/hm ，供氮率为7.07%~23.53% 。3 种母质类型，以花岗岩 风化物发育的水稻土供氮潜力最高，明显高于第四纪红土母质和河流冲积物发育的水稻土；3 种稻作 制，以水稻改旱作3~5 年后的土壤供氮潜力最低，明显低于水旱轮作和双季稻田土壤。 关键词：水稻土；矿化氮量；全氮；碱解氮；供氮量；供氮率 中图分类号：S158 文献标志码：A 论文编号：2012-3276 Status of Soil Nitrogen and Nitrogen Mineralization Characteristic in Paddy Soil of Hunan Province Peng Yinyan, Huang Yunxiang, Yin Lichu, Sun Mei (CollegeofResourcesandEnvironment,HunanAgriculturalUniversity, Changsha 410128) Abstract: In order to investigate the characteristic of N fertility and N mineralization in paddy soil of Hunan Province, waterflooded incubation two weeks (improved method) was proposed by Waring and Bremer to study the N mineralization characteristic of three rice based cropping systems paddy soil derived from three kinds of type of parent material in Changsha County, also forecasted the nitrogen supplying capacity of soil. The results showed that, total N and alkaline hydrolytic N of tested soil respectively varied from 0.60-1.50 g/k and 84.10-182.70 mg/kg, and showed normal distribution. The mineralizable N