首页 | 官方网站   微博 | 高级检索  
     

秸秆还田对土壤氮素转化的影响
引用本文:李贵桐,赵紫娟,黄元仿,李保国.秸秆还田对土壤氮素转化的影响[J].植物营养与肥料学报,2002,8(2):162-167.
作者姓名:李贵桐  赵紫娟  黄元仿  李保国
作者单位:1.中国农业大学资源环境学院 北京100094
基金项目:国家重点基础研究发展规划项目(G1999011709);中澳合作项目(ACIAR, LWR1/96/164)资助.
摘    要:利用原状土柱田间培养法 ,测定了冬小麦、夏玉米农田土壤氮 (N)素的年净矿化量 ;利用氯仿熏蒸浸提茚三酮反应氮法测定了土壤微生物量氮的数量 ;利用连续流动分析仪测定了土壤表层无机氮的含量。结果表明 ,在冬小麦秸秆覆盖、夏玉米秸秆翻埋的土壤中 ,第 1年土壤氮净矿化量为N 210kg/hm2,第 2年为 179kg/hm2,2年的净矿化量均基本与同期施氮量相当。在秸秆不还田的土壤中 ,第 1年土壤氮净矿化量为N 164kg/hm2,第 2年为248kg/hm2,年际变化较大。翻埋玉米秸秆导致小麦季土壤表层无机氮数量增加 ,引发土壤氮矿化的正激发效应 ;表层覆盖小麦秸秆对玉米季土壤表层无机氮的影响不明显。秸秆还田后 ,每个生育期开始时 ,土壤微生物量氮比不还田土壤的增加 72 %~ 2.34% ,每个生育期结束时增加 34%~ 72%。在实施秸秆还田的最初 2年内 ,土壤微生物量但氮处于动态调整阶段 ,尚未达到新的稳定状态

关 键 词:土壤氮矿化    原状土柱田间培养法    秸秆还田    土壤微生物量氮
文章编号:1008-505X(2002)02-0162-06
修稿时间:2001年1月16日

Effect of straw returning on soil nitrogen transformation
LI Gui-tong,ZHAO Zi-juan,HUANG Yuan-fang,LI Bao-guo.Effect of straw returning on soil nitrogen transformation[J].Plant Nutrition and Fertilizer Science,2002,8(2):162-167.
Authors:LI Gui-tong  ZHAO Zi-juan  HUANG Yuan-fang  LI Bao-guo
Affiliation:1.College of Resource and Environment;China Agricultural University;Beijing 100094;China
Abstract:The amount of soil nitrogen net mineralization in field cropped with winter wheat and summer maize was measured by in situ incubation method The soil microbial biomass nitrogen was measured by chloroform fumigation extraction and ninhydrin reactive nitrogen method The soil inorganic N was measured by continued flow analysis instrument In the soil covered with winter wheat straw in summer and incorporated with summer maize straw in autumn, the net N mineralization was 210kg/hm2 in the first year, 179 kg/hm2 in the second year The net mineralization was approximately equal to the amount of applied N In the non-straw returning soil the net mineralization was 164 and 248 kg/hm2 in the first and second year, respectively Incorporating maize straw to the soil resulted in increase of inorganic N during wheat season and positive effect of soil N mineralization Surfacing wheat straw in summer gave no significant difference in soil inorganic N The soil microbial biomass N in straw returning soil was 72~234% greater than that in the non-straw returning at beginning of each season, and was 34~72% greater at ending of each season The soil microbial biomass N in straw returning soil alternate during the first 2 years and did not be stable at a new level
Keywords:
本文献已被 维普 万方数据 等数据库收录!
点击此处可从《植物营养与肥料学报》浏览原始摘要信息
点击此处可从《植物营养与肥料学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号