草业学报2025，Vol.34Issue(6)：193-202,10.DOI:10.11686/cyxb2023459
氮磷配施对高寒区老芒麦饲草产量的影响
Effect of nitrogen and phosphorus combined application on forage yield of Elymus sibiricus in an alpine region
摘要
Abstract
This research investigated the effects of different application rates of nitrogen and phosphorus fertilizer on forage yield of Elymus sibiricus cv.Qingmu No.2 in an alpine region.Four nitrogen fertilizer rates(0,60,90,120 kg N·ha-1)and four phosphate fertilizer rates(0,30,60,90 kg P·ha-1)levels were included in the experiment to identify the effect of the various N and P fertilizer combinations on E.sibiricus growth traits,forage yield and economic return.Structural equation modelling was used to assess the pathways by which effects of the different N and P combinations influenced the forage yield of E.sibiricus.This research provides data to underpin extension advice to farmers on how to achieve efficient production of high-quality forage in alpine regions.It was found:1)Plant height,stem diameter,tiller numbers,fertile tiller numbers,forage yield and economic return of E.sibiricus were significantly increased by combined N and P application,and those traits showed a pattern of initial increase and then decrease with increase in P application at the same N application level.2)The forage yield and net income were the highest(12154.14 kg·ha-1 and 3370.49 CNY·ha-1 respectively),in the treatment with a combined application of 60 kg N·ha-1 and 60 kg P·ha-1.3)The structural equation model showed that tillering is the primary driving factor for improving the forage yield of E.sibiricus under combined application of N and P fertilizer.4)Integrated evaluation of traits using a TOPSIS model showed that the combined application of 60 kg N·ha-1 and 60 kg P·ha-1 not only maintained higher forage yield,but also significantly improved economic returns,compared to other treatments.This N and P combination is therefore recommended as suitable management practice for forage production of E.sibiricus in alpine regions.关键词
老芒麦/氮磷配施/饲草产量/经济效益Key words
Elymus sibiricus/nitrogen and phosphorus combined application/forage yield/economic benefits引用本文复制引用
刘启林,王小军,王金兰,刘文辉,马巧玲,李建辉,张生原,曹文侠,李文..氮磷配施对高寒区老芒麦饲草产量的影响[J].草业学报,2025,34(6):193-202,10.基金项目
国家重点研发计划项目(2022YFD1602307)和国家牧草产业技术体系(CARS-34)资助. （2022YFD1602307）
