摘要
通过连续 8年定位试验 ,研究了不同施肥方式下土壤有机质氧化稳定性的动态变化及其与作物产量和肥力水平的关系。结果表明 ,长期不施肥或施用常量N、P、K化肥 ,使土壤易氧化有机质含量明显下降 ,进而引起土壤有机质总量减少 ,氧化稳定系数 (Kos)升高 ,土壤供肥能力降低 ;连续施用增量N、P、K化肥 ,可使土壤有机质及Kos值保持稳定 ,但投入成本较高 ;长期施用有机肥 (物 )料配施常量N、P、K化肥 ,可明显提高土壤易氧化有机质含量和有机质总量 ,降低其Kos值 ,土壤对养分的供、贮能力增强 ,肥力提高 ,同时其作物产量显著高于增量N、P、K化肥处理。不同施肥方式主要影响土壤易氧化有机质含量 。
A eight years long-term experiment with five different kinds of fertilizer application treatments were conducted. The relationship between dynamic changes of oxidation stability of soil organic matter and fertility was studied. The results showed that with readily oxidizable organic matter decrease under long term no fertilization or constant N,P,K chemical fertilizer application, total soil organic matter decreased. And soil fertility decreased. With increment N,P,K chemical fertilizer applied successively, soil organic matter and oxidation stability coefficient kept steady with high kos. Under long term organic manure used together with constant N,P,K fertilizer, soil readily oxidizable organic matter and total organic matter increased significantly. Oxidation stablility coefficient decreased.Reserves and supply of soil nutrient improved. And the crop yield was significant higher than incrememnt N,P,K chemical fertilizer treatment. There were obvious effect on soil readily oxidizable organic matter and little effect on difficultly oxidizable organic matter with different fertilization treatments.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2000年第3期31-35,共5页
Journal of Hebei Agricultural University
基金
河北省科委"九五"重点科技攻关项目! (96 2 2 0 916D - 4)
关键词
氧化稳定系数
土壤有机质
施肥
土壤肥力
long-term fertilization
organic matter
oxidation stability coefficient
dynamic change
fertility
