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(^(15)N),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。
This paper deals with the turnover of nitrogen deprived from the newly fixed fertilizer nitrogen and the native humus nitrogen in soil, and the effect of soil pretreatment e.g.drying and sterilizing, on nitrogen mineralization. The results obtained were presented as follows: 1. 91.50% of fixed nitrogen in soil could be accounted for in soil biomass, and 90.71% of net increase of biomass nitrogen was traced from ammounium sulphate added while the amount of nitrogen deprived from native humus was only 10%. 2. Drying the soil could accelerate nitrogen mineralization and the drying effect could be eliminated by pre-incubating the soil for 10 days. Drying effect was much greater on the newly fixed nitrogen mainly in soil biomass than on the native humus nitrogen.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1991年第1期54-58,共5页
Journal of Nanjing Agricultural University
关键词
土壤
预处理
矿化
氮
soil
nitrogen
mineralization
immobilization
nitrogen in biomass
soil pretreatment
