摘要
在各长期轮作施肥系统中，耕层土壤矿化培养过程扣ＰＨ及剖面矿化势的变化，说明了长期不贩 轮作和施肥方式引起土壤有机氮数量和性质的变化，ＰＨ变化具有一共同特征，在０～４周，各处理间差异显著，而后期变化趋势，趋于一致，向策碱性环境发展。各处理的剖面矿化势的变化反映了有机氮可矿化数量的改变，小麦连作施肥和苣稽连作施肥均说明施用有机肥对土壤有机氮水平有较好的提高作用。
From incubation process of soils of different treatment, it can be concluded that the amount and quality of soil organic-N had been changed under the incubation. There is a common character of variation during the incubation process. The differences between treatment are significant in 0~4 weeks; but in 6~12 weeks, the trend of change is consistent to alkalescence. The rotation and fertilization of wheat and Medicago sativa show that the application of organic fertilization can boost the content of soil organic-N; the enhancement effect of 3-year抯 rotation of grain-legume is better than that of 4-year抯 rotation of grain-forage-legume and that of bareness disposal.
出处
《土壤与环境》
CSCD
2000年第2期129-131,共3页
Soil and Environmental Sciences
基金
国家自然科学基金重大项目(49890330)
关键词
轮作
施肥
矿化势
土壤有机氮
分解特性
long-trem rotation and fertilization
pH
mineralization of soil organic-N
