水土保持学报2024，Vol.38Issue(4)：279-287,9.DOI:10.13870/j.cnki.stbcxb.2024.04.005
禾豆间作系统水分和根系分隔对牧草氮素吸收利用及转移的影响
Effects of Water and Root Separation on Nitrogen Uptake,Utilization and Transfer in a Gramineae-Legume Intercropping System
摘要
Abstract
[Objective]Gramineae-legume intercropping can give consideration to production and ecological benefits,improve nitrogen use efficiency and reduce nitrogen pollution.At present,the process of nitrogen utilization,absorption and transfer distribution in gramineae-legume intercropping systems under different water conditions is not clear.[Methods]The above ground biomass,nitrogen absorption and utilization,nitrogen fixation rate,and nitrogen transfer rate of gramineae-legume intercropping were studied by using water treatment with the same total water amount in 2 periods but with an interval of 3 or 5 days,combined with root separation(non-separation,nylon mesh separation and plastic plate separation)and nitrogen isotope labeling methods.[Results]The aboveground biomass,nitrogen content and nitrogen accumulation of E.dahuricus intercropped with alfalfa were significantly increased compared with monoculture E.dahuricus,while,for alfalfa,the intercropping with E.dahuricus resulted in a decrease compared to monoculture alfalfa.Under the condition of the same total water amount,the above-ground biomass of the herbage increased by 6.28％and 17.32％,respectively,by high-frequency water treatment compared with medium and low frequency water treatments,and the nitrogen fixation rate of alfalfa was increased by 39.82％and 44.81％,respectively,under high-frequency water treatment compared with medium and low frequency water treatments.However,the nitrogen concentration and nitrogen accumulation under some middle and low frequency water treatments were significantly higher than those under high frequency water treatment(p＜0.05),and promoted nitrogen transfer.Root separation weakened the interaction between grass and bean,and showed that as root separation increased the aboveground biomass,nitrogen concent and aboveground nitrogen accumulation of intercropping alfalfa,and decreased the corresponding indexes of intercropping E.dahuricus.The nitrogen fixation and nitrogen transfer rate of alfalfa intercropping were in the order of no separation＞nylon mesh separation＞plastic plate separation.[Conclusion]Moderate water regulation can improve the advantages of gramineae-legume intercropping,and root interaction is the key to promote the biological nitrogen fixation and nitrogen transfer of legume herbage.关键词
禾豆间作/根系分隔/水分处理/氮素利用/氮转移效率Key words
gramineae-legume intercropping/root separation/water treatment/nitrogen utilization/nitrogen transfer efficiency分类
农业科技引用本文复制引用
王一帆,刘华清,赵西宁,高晓东..禾豆间作系统水分和根系分隔对牧草氮素吸收利用及转移的影响[J].水土保持学报,2024,38(4):279-287,9.基金项目
区域创新发展联合基金重点项目(U22A20613) （U22A20613）
国家重点研发计划项目(2021YFD1900700) （2021YFD1900700）
国家自然科学基金项目(42125705) （42125705）
