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根区局部灌溉和有机无机氮比例对玉米水分利用和土壤氮磷含量的影响 被引量:6

Effect of Partial Root-zone Irrigation and Ratio of Organic to Inorganic N on Maize Water Use and Soil N and P Contents
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摘要 根区局部灌溉(PRI)是新的高效节水技术,由于创造了一个土壤水分分布不均匀的环境,从而影响土壤水分养分利用。通过盆栽试验,研究了PRI和有机无机氮(N)比例对玉米干物质积累和水分利用以及拔节期、大喇叭口期和灌浆期土壤N、磷(P)含量的影响。试验设3种灌溉方式,即常规灌溉(CI),分根区交替灌溉(APRI),固定部分根区灌溉(FPRI)和3种有机无机N比例,即100%无机N(F1),70%无机N+30%有机N(F2),40%无机N+60%有机N(F3)。与CI相比,PRI玉米耗水量减少7.7%~17.1%,水分利用效率(WUE)提高2.4%~14.1%;玉米生长后期PRI湿润区土壤速效N和P含量较低,而PRI干燥区则较高。3种灌溉处理时,与F1相比,F2和F3时玉米总干物质质量和耗水量有所增加,从而玉米WUE分别提高5.5%~10.8%和0.5%~7.9%。这表明PRI和适当有机N比例可以有效提高玉米水分利用效率,且FPRI较APRI易造成干湿区域土壤速效N和P含量的差异明显。 Partial root-zone irrigation(PRI) is a newly high-efficient water saving technique and creates a heterogeneous soil moisture distribution that may affect soil water and nutrient use.This study investigated maize dry mass accumulation and water use,soil N and P contents from jointing to grain filling stages of maize crop subjected to PRI and different ratios of inorganic to organic N fertilizers in a pot experiment.Three irrigation methods,i.e.conventional irrigation(CI),alternate PRI(APRI) and fixed PRI(FPRI) and three ratios of inorganic to organic N,i.e.100% inorganic(F1),70% inorganic + 30% organic(F2) and 40% inorganic + 60% organic(F3),were applied.Compared to CI,PRI reduced water consumption of maize by 7.7%-17.1% and increased water use efficiency(WUE) of maize by 2.4%-14.1%,and PRI reduced soil available N and P contents in PRI wet area but increased in PRI dry area at later growth stage of maize.Compared to F1,F2 and F3 treatments increased water consumption and WUE of maize by 5.5%-10.8% and 0.5%-7.9%,respectively.Results indicated that PRI and appropriate ratios of inorganic to organic N could increase maize WUE.Compared to APRI,FPRI caused more significant difference of available N and P contents in soil between the dry and wet root-zone.
机构地区 广西大学农学院
出处 《土壤通报》 CAS CSCD 北大核心 2011年第1期22-26,共5页 Chinese Journal of Soil Science
基金 国家自然科学基金(50869001) 国家973计划项目(2006CB403406) 广西教育厅研究生教育科研创新计划项目(2007-93)资助
关键词 根区局部灌溉 有机无机氮比例 玉米水分利用 土壤氮磷 Partial root-zone irrigation Ratio of inorganic to organic N Maize water use Soil N and P
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