土壤预处理对不同起源氮矿化的影响

被引:20
作者
沈其荣
史瑞和
机构
[1] 南京农业大学土壤农业化学系
关键词
土壤; 氮; 矿化; 固定; 生物态氮; 土壤预处理;
D O I
暂无
中图分类号
S158.3 [土壤肥力与植物];
学科分类号
摘要
本文研究了化肥起源氮及土壤固有氮在土壤中的转化过程以及风干、灭菌处理对土壤氮矿化的影响。结果指出:土壤一开始强烈固定的无机氮中,有91.50%是被固定在土壤微生物体内,土壤生物氮的净增量中,平均有90.71%来自所施标记硫铵(15N),而来自原有土壤的矿化氮不足10%;风干对土壤氮矿化的影响很大,对于风干土可通过预培养10天来消除风干效应;风干对不同来源的有机氮的矿化影响是不同的,风干对新固定态氮的影响远大于土壤固有态氮;由于干土效应而引起的土壤有机氮易分解的部分绝大多数是微生物体内物质。
引用
收藏
页码:54 / 58
页数:5
相关论文
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