草业学报2026，Vol.35Issue(1)：40-52,13.DOI:10.11686/cyxb2025059
饲用高粱/拉巴豆混播模式下施氮量对草地生产力和能量利用效率的影响
Effect of nitrogen application on grass productivity and energy use efficiency in a mixed forage sorghum/lablab planting
摘要
Abstract
The aim of this study was to determine the effects of different nitrogen application rates on grassland production performance,economic efficiency,energy use efficiency,and ecological efficiency index under mixed seeding conditions.The overall aim of our research was to provide a scientific basis for the efficient use of N fertilizer to achieve environmentally sustainable development.We conducted a field trial in 2021-2023 at the Sidunzi Grass Field Science Research Base of Ningxia University.The experiment had a two-factor design with two cropping patterns(SS:forage sorghum monoculture;SL:forage sorghum/lablab mixed cropping)and four N application rates(N0:0 kg·ha-1;N90:90 kg·ha-1;N180:180 kg·ha-1;N270:270 kg·ha-1).It was found that the synergistic effect of mixed seeding and nitrogen fertilization significantly increased the hay yield and crude protein yield of the system.The optimum production performance was obtained with the mixed crop fertilized with N at 180 kg·ha-1.This treatment had the highest hay yield(29.08 t·ha-1)and crude protein yield(2.62 t·ha-1).These values were higher on average by 20.69%-23.86%and 21.03%-26.89%,respectively,compared with those in the other treatments and the control.An economic benefit analysis showed that the forage sorghum/lablab mixed planting fertilized with 180 kg·ha-1 N had the highest average annual net income and net energy output.The values for this treatment 33.94%and 21.32%higher,respectively,than those in the control(no fertilizer),demonstrating good economic-energy synergy effects.The forage sorghum/lablab mix with 90 kg·ha-1 N application had the highest energy use efficiency and energy productivity at 10.84 and 0.60 kg·MJ-1,respectively.These values were 1.94%and 1.95%higher than the respective values in the control.The sustainability of the different cropping patterns was evaluated on the basis of the forage yield,economic efficiency,energy use efficiency,and ecological efficiency index.The highest sustainability index(0.97)was obtained for the mixed crop with N application at 180 kg·ha-1.Therefore,application of N fertilizer at 180 kg·ha-1 is the optimum level for the forage sorghum/lablab mixed cropping system in the Northwest Arid Zone.This treatment improves the forage yield and sustainability of the cropping system with relatively low N fertilizer inputs.关键词
混播/氮肥/生产性能/生态效能指数/经济效益Key words
seed mixing/nitrogen fertilizer/production performance/eco-efficiency index/economic benefit引用本文复制引用
张译尹,肖爱萍,王斌,王腾飞,胡海英,兰剑..饲用高粱/拉巴豆混播模式下施氮量对草地生产力和能量利用效率的影响[J].草业学报,2026,35(1):40-52,13.基金项目
国家自然科学基金项目(32201474),宁夏高等学校一流学科建设(草学学科)项目(NXYLK2017A01)和"一年两熟"人工草地可持续发展模式研究与示范项目(2021BBF02001)资助. （32201474）
