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Dynamic changes of soil NO_3~--N as affected by different N fertilizer application and weed treatments in semi-humid winter wheat field
Authors
侯红乾
南维鸽
李世清
李生秀
Publication date
1 January 2008
Publisher
Abstract
以中等肥力土垫旱耕人为土为供试土壤,在冬小麦(Triticumaestivum)不同生育期采集0—100 cm土层土壤样品,研究不同施肥及杂草处理对半湿润农田生态系统土壤NO3--N动态变化的影响。结果表明,1)土壤剖面NO3--N含量随施氮量增加而显著增加,0—100 cm土层NO3--N累积量与施氮量线性相关;在越冬期、返青期和拔节期,相关系数r分别为0.995、0.971和0.949。2)冬小麦生长过程中,土体NO3--N含量先降低后回升,在拔节期最低;成熟期土壤有机氮矿化产生的NO3--N是收获后土壤剖面残留NO3--N的主要贡献者。3)在越冬期、返青期、拔节期和成熟期,施磷(PN135)与不施磷(P0N135)处理相比,施磷可显著减少土体NO3--N累积量,减少量分别为N61.4、26.9、36.6和5.5 kg/hm2;磷肥对土壤NO3--N残留累积量的削减效应以越冬期表现最为显著,成熟期表现不显著。4)在施磷的基础上,不同杂草处理土壤剖面NO3--N累积量在施氮量为45 kg/hm2(PN45)及90 kg/hm2(PN90)时差异不显著;而在施氮量为180 kg/hm2(即PN180)的高氮处..
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018