中国生态农业学报2017，Vol.25Issue(2)：200-210,11.DOI:10.13930/j.cnki.cjea.160530
施氮和根间互作对密植大麦间作豌豆氮素利用的协同效应
Response of nitrogen utilization to root interaction and plant density in barley-pea intercropping system
摘要
Abstract
To investigate the mechanism of high planting density in cereal-legume intercropping system,a pot experiment of barley-pea intercropping system was carried out and the effects of nitrogen (N) application and root barrier on nitrogen and fertilizer use efficiency under high planting density of barley were determined.In the experiment,three factors,each with two treatment levels — N fertilizer application [no N application and N application with 100 mg(N)·kg-1],root barrier [no barrier with root interaction and root barrier without root interaction) and planting density (low density with 15 barley plants per pot and high density with 25 barley plants per pot) were set up.The results showed that:1) N application,plant root interaction and high barley planting density improved N uptake of barley-pea intercropping system.Compared with no N application treatment,N uptake increased by 33.8％ in N application treatment.There was also 81.1％ increase in N uptake under no root barrier treatment over root barrier treatment.N uptake under high planting density treatment increased by 4.2％ compared with low planting density treatment.Plant root interaction improved N uptake by 92.4％ and 11.0％,respectively,under no N application and N application treatments.Increasing planting density with root interaction significantly increased N uptake of the intercropping system.2) Barely plant performed better for N competition,and its' N competition ratio significantly increased under high planting density.However,N application reduced barley N competition ratio.Compared with pea,barley was highest in competitive advantage at heading stage.3) Root interaction improved grain N content of barley and pea,respectively,by 126.7％ and 26.9％ under N application treatment.Also barley and pea kernel N content increased,respectively,by 188.5％ and 46.5％ under no N treatment.There was a significant interaction between N application and root interaction for kernel N content.4) High barley planting density significantly improved N use efficiency by 59.8％ under root interaction treatment of the intercropping system.N competition between barley and pea was positively correlated with N use efficiency in the intercropping plant population.In conclusion,interactions of N application,root barrier and barley planting density enhanced crop productivity of barley-pea intercropping system.Proper N application and sufficient root interaction made feasible high planting density intercropping system,optimized competition between barley and pea,and improved N uptake and use efficiency.关键词
大麦间作豌豆系统/根间互作/施氮量/吸氮量/氮肥利用率/氮素竞争比率Key words
Barley-pea intercropping/Root interaction/Nitrogen application amount/Nitrogen uptake/Nitrogen use efficiency/Nitrogen competition ratio分类
农业科技引用本文复制引用
王利立,朱永永,赵彦华,殷文,柴强..施氮和根间互作对密植大麦间作豌豆氮素利用的协同效应[J].中国生态农业学报,2017,25(2):200-210,11.基金项目
国家自然科学基金项目(31160265,31360323)和甘肃农业大学“伏羲杰出人才培育计划”资助This study was supported by the National Natural Science Foundation of China (31160265,31360323),and the Outstanding Talent Culture Project of Gansu Agriculture University. （31160265,31360323）
