洞庭湖平原冲积性菜园土无机氮形态及剖面分布  

Inorganic nitrogen fractions and profile distribution characteristic in vegetable soil derived from river alluvial in Dongting Lake plain

作　　者：黄运湘[1] 张杨珠[1] 曾艳 廖超林[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]株洲市农业局,湖南株洲412011

出　　处：《湖南农业大学学报（自然科学版）》2010年第6期700-704,共5页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：国家科技支撑计划项目(2006BAD17B08-03)

摘　　要：采用野外调查取样和室内分析相结合的方法,研究了洞庭湖平原冲积性菜园土无机氮形态及剖面分布规律.结果表明,耕层土壤全N平均含量为1.25g/kg,变化范围为0.65～1.67g/kg,变异系数为15.54%;固定态铵平均含量为295mg/kg,占土壤全氮含量的23.2%,NO3--N和NH4+-N平均含量分别为46.00、1.91mg/kg.土壤全N、铵态氮、固定态铵含量在0～80cm土层中随剖面深度的增加而降低,硝态氮的剖面分布表现有淋洗下移的现象.By means of both field investigation samples and indoor analysis,The inorganic nitrogen fractions and profile distribution characteristic in vegetable soil derived from river alluvial in dongting lake plain were researched.The result indicated that the content of total nitrogen varies from 0.65~1.67 g/kg,the average value and coefficient of variation is respectively 1.25 g/kg and 15.54%.The average value of fixed ammonium is 290 mg/kg,accounting for 23.2% of total nitrogen.The content of NO3--N and NH4＋-N is respectively 46.00 mg/kg and 1.91 mg/kg.The content of total N,NH4＋-N,and fixed ammonium decreased with the increasing of soil profile depth in 0~80 cm.NO3--N display leaching phenomenon from surface soil to subsoil.

关 键 词：土壤无机氮形态 剖面分布特征 菜园土 洞庭湖平原 

分 类 号：S158.3[农业科学—土壤学]