氮、磷、钾配施对榆林沙地紫花苜蓿根系性状的影响  

Effect of nitrogen,phosphorus and potassium fertilizer on root traits of alfalfa in Yulin sandy land

作　　者：常瑜池 徐伟洲[1] 武治兴 刘阳 史雷[1] 乔雨 崔亦沐 CHANG Yu-chi;XU Wei-zhou;WU Zhi-xing;LIU Yang;SHI Lei;QIAO Yu;CUI Yi-mu

机构地区：[1]榆林学院生命科学学院,陕西榆林719000 [2]榆林市经济发展服务中心,陕西榆林719000

出　　处：《饲料研究》2022年第5期114-119,共6页Feed Research

基　　金：陕西省重点研发计划项目一般项目“陕北采煤沉陷区草地植物群落衰退机理与恢复技术研究(项目编号:2019SF-267)”。

摘　　要：试验研究榆林北部风沙草滩区紫花苜蓿(Medicago sativa L.)栽培的最优施肥组合,探讨不同氮磷钾配施处理下紫花苜蓿根系性状差异。试验以中苜3号为供试材料,采用三因素正交旋转方法,设置15组氮磷钾肥料配施组合,测定根系总表面积、平均根直径、总根长、根系总体积及根系总生物量等性状指标。结果显示:0~10 cm和10~20 cm土层的根系总生物量显著高于20~30 cm土层;N_(16)P_(10)K_(8)配施下具有相对较高的根系总生物量、总表面积、总体积、总根长、侧根数量以及相对较低的主根长,且其隶属平均值最高。研究表明,N_(16)P_(10)K_(8)配施组合可明显增加紫花苜蓿根系总吸收表面积以提高其对表层土壤养分的吸收能力。The aim of the study was to investigate the root traits of alfalfa(Medicago sativa L.) under different nitrogen,phosphorus and potassium treatments in the northern Yulin sandy grassland area. Using Zhongmu No.3 as experimental material, 15 combinations of nitrogen, phosphorus and potassium fertilizers were set up by three factors orthogonal rotation method, and the total root surface area, average root diameter, total root length, total root volume and total root biomass were measured. The results showed that the total root biomass in 0~10 cm and 10~20 cm soil layers were significantly higher than that in 20~30 cm soil layers. N_(16)P_(10)K_(8) combined application had relatively higher total root biomass, total surface area, total volume, total root length, lateral root number, and relatively lower taproot length, and its subordinate average was the highest. The study indicates that the N_(16)P_(10)K_(8) combined application can significantly increase the total root absorption surface area of alfalfa to improve its ability to absorb surface soil nutrients.

关 键 词：紫花苜蓿 肥料配施 根系形态 表面积 

分 类 号：S816[农业科学—饲料科学]