摘要
为探讨氮磷肥配施对高寒区老芒麦饲草产量的影响,本研究以青牧2号老芒麦(Qingmu No.2)为材料,设置了4个氮肥(纯N,0、60、90、120 kg·hm^(-2))和4个磷肥(纯P,0、30、60、90 kg·hm^(-2))水平,分析不同氮磷配施处理下老芒麦生长性状、饲草产量及经济效益的变化,并采用结构方程模型探讨氮磷配施对老芒麦饲草产量的影响过程及其路径系数,以期为高寒区优质饲草高效生产提供数据支撑。结果表明:1)氮磷配施显著提高了老芒麦的株高、茎粗、分蘖数、生殖枝数、饲草产量及经济效益,在同一施氮水平下,随施磷量的增加,以上指标均呈先增后降的变化趋势;2)在60 kg N·hm^(-2)与60 kg P·hm^(-2)配施时,老芒麦饲草产量及增产净收益均最大,分别为12154.14 kg·hm^(-2)和3370.49元·hm^(-2);3)结构方程模型表明,氮磷配施主要通过促进分蘖来提高老芒麦的饲草产量;4)TOPSIS-多准则决策模型分析表明,60 kg N·hm^(-2)与60 kg P·hm^(-2)配施不但可以保持较高的饲草产量,还可显著提高经济效益,是适宜于高寒地区老芒麦饲草生产的最佳氮磷配施量。
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.
作者
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
LIU Qi-lin;WANG Xiao-jun;WANG Jin-lan;LIU Wen-hui;MA Qiao-ling;LI Jian-hui;ZHANG Sheng-yuan;CAO Wen-xia;LI Wen(College of Pratacultural Science,Gansu Agricultural University,Lanzhou 730070,China;Qinghai Academy of Animal Science and Veterinary Medicine,Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau,Xining 810016,China;State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University,Xining 810016,China;Qinghai Province Sanjiang Technology Company Limited,Xining 810016,China)
出处
《草业学报》
北大核心
2025年第6期193-202,共10页
Acta Prataculturae Sinica
基金
国家重点研发计划项目(2022YFD1602307)
国家牧草产业技术体系(CARS-34)资助。
关键词
老芒麦
氮磷配施
饲草产量
经济效益
Elymus sibiricus
nitrogen and phosphorus combined application
forage yield
economic benefits
作者简介
刘启林(1998-),男,河北衡水人,在读硕士。E-mail:1550778042@qq.com;通信作者:曹文侠,E-mail:caowx@gsau.edu.cn;通信作者:李文,E-mail:lw@qhu.edu.cn。
