摘要
人工模拟放水冲刷试验研究结果表明 ,随放水冲刷强度的增大 ,不同土壤硝态氮、铵态氮、有机质和全氮流失加剧 ,泥沙全氮和有机质富集程度减少 ;当给不同土壤施等量的硝酸铵时 ,发现随径流流失化肥的铵态氮和硝态氮分别占施入量的 0 .9%～ 3 .5 %和 8.2 %～ 19.7% ,硝酸铵主要随径流流失 ,以泥沙颗粒流失量甚微 ;土壤侵蚀、有机质和全氮流失量与 >2 0 μm团聚体相关系数分别为 -0 .893 5、-0 .792 8和 -0 .815 1,2 0
The results of artificial water scoured experiment show that with the increase of water scoured intensity,the losses of nitrate and ammonium in runoff ,and those of organic matter and total N in sediment increased greatly,while the enrichment ratios of organic matter and total N in sediment reduced correspondingly.When the soils in gully hilly loess region were fertilized with same amount of NH\-4NO\-3,the ammonium and nitrate loss in runoff was respectively 0\^9～3\^5% and 8\^2～19\^7% of the application amount. Nitrate mainly lossed in runoff, not in sediment.The correlation coefficient of soil erosion module,organic matter and total N loss with>20μm soil aggregates was -0\^8935,-0\^7928 and -0\^8151,respectively.The content of >20μm soil aggregates could be used as an index to differentiate the soil organic matter and total N loss.
出处
《应用生态学报》
CAS
CSCD
2000年第2期231-234,共4页
Chinese Journal of Applied Ecology
基金
中国科学院重大资助项目! (KZ951-B1-211)
1 997年度"西部之光"项目
国家自然科学基金!(49871049)
国家"九五"科技攻关资助项
