中国草地学报2026，Vol.48Issue(6)：67-75,9.DOI:10.16742/j.zgcdxb.20250458
氮磷添加对高寒区老芒麦种子生产的影响
Effects of Nitrogen and Phosphorus Addition on Seed Production of Elymus sibiricus in Alpine Regions
摘要
Abstract
To evaluate the effects of nitrogen(N)and phosphorus(P)fertilization on seed yield and yield components of Elymus sibiricus in alpine regions,the cultivar'Qingmu 2'was used as the experimental material.Four N levels(N0:0 kg N/hm2,N1:60 kg N/hm2,N2:90 kg N/hm2,N3:120 kg N/hm2)and four P levels(P0:0 kg P2O5/hm2,P1:30 kg P2O5/hm2,P2:60 kg P2O5/hm2,P3:90 kg P2O5/hm2)were established to assess seed yield and yield components,and economic returns.The results showed that under combined N and P application,spikelet number per reproductive tiller,seed number per spike,spike length,thousand seed weight,and seed yield of E.sibiricus first increased and then decreased with the increasing P application rate.Among all treatments,N1P2(60 kg N/hm2+60 kg P2O5/hm2)showed the best overall performance,with a seed yield of 1 654.69 kg/hm2,representing a 74.8%increase over the unfertilized control.The corresponding economic return reached 12 074.41 CNY/hm2.Structural equation modeling indicated that the positive effect of N and P fertilization on seed yield was mainly mediated through an increase in tiller number.Comprehensive evaluation using the Technique for Order Preference by Similarity to Ideal Solution(TOPSIS)identified N1P2 as the optimal fertilization regime for E.sibiricus seed production in alpine regions.These findings provide a theoretical basis and technical support for effi-cient seed production of E.sibiricus in alpine regions.关键词
高寒区/老芒麦/氮磷配施/种子产量/产量组分Key words
Alpine region/Elymus sibiricus/Nitrogen and phosphorus combined application/Seed yield/Yield components分类
农业科技引用本文复制引用
李晶,刘启林,王小军,王金兰,刘文辉,刘凯强,章海龙,李文..氮磷添加对高寒区老芒麦种子生产的影响[J].中国草地学报,2026,48(6):67-75,9.基金项目
种子扩繁关键技术研发(SJCZFY2025-04) （SJCZFY2025-04）
