黄土旱塬区长期施氮对土壤剖面养分分布的影响  

Effect of long-term applying nitrogen fertilizer on the distribution of butrients of soil profiles in arid highland of the Loess Plateau

作　　者：彭令发[1] 郝明德[2] 来璐[1] 李丽霞[1] 

机构地区：[1]西北农林科技大学资源环境学院 [2]中国科学院水利部水土保持研究所,陕西杨陵712100

出　　处：《西北植物学报》2003年第8期1475-1478,共4页Acta Botanica Boreali-Occidentalia Sinica

基　　金：中国科学院知识创新工程项目(KZCX2-413);国家科技攻关课题资助(2001BA808B18)

摘　　要：对黄土塬区冬小麦连作条件下施用氮肥对土壤养分在剖面分布的影响进行了研究。试验结果表明,有机质、全氮和有效氮在土壤剖面大致呈"S"型分布,全磷在整个剖面呈抛物线型分布。不同处理耕层土壤养分差异较明显,耕层以下土壤养分变化趋势与耕层基本相一致。长期施用氮肥对土壤60cm以上土层土壤养分影响较大,而对100cm以下土层土壤养分影响较小。单施化学氮肥对土壤肥力影响不明显,而有机肥与化学氮肥配合施用对提高土壤肥力有较好的作用。Based on longterm experiment,this paper mainly researches the effect of longterm continuous winter wheat and nitrogen fertilizer on the distribution of nutrients of soil profiles.The experiment results show that the profile of organic matter,total nitrogen and available nitrogen is taken on the Sshaped distribution,but total phosphorus is the parabolic form in soil profiles.The nutrients difference of the layers below topsoil is biggest under different treatments,even though the nutrients difference of the layers below topsoil is on the decrease,but their changes tendency is the same as topsoils.Longterm applying nitrogen fertilizer mainly affects soil nutrients over 60 cm soil layers,but little affect soil nutrients below 100 cm soil profiles.Only applying chemical nitrogen fertilizer does not evidently affect soil fertility,and applying organic manure and chemical nitrogen fertilizer has a special role on improving soil fertility.

关 键 词：黄土旱塬 长期施用氮肥 土壤养分 剖面分布 

分 类 号：Q945.15[生物学—植物学] S157.41[农业科学—土壤学]