干旱区研究2026，Vol.43Issue(5)：1001-1012,12.DOI:10.13866/j.azr.2026.05.10
短期施氮对新疆伊犁半干旱山地草原植物群落及物种多样性的影响
Effects of short-term nitrogen application on plant communities and species diversity in semiarid mountain grasslands of Yili,Xinjiang
摘要
Abstract
To investigate the response patterns of plant communities in the semiarid mountain grasslands of Yili,Xinjiang,to short-term nitrogen application,this study examined the Tohulasu Grassland in the Yili River Val-ley.Four nitrogen application rates(N1:50 kg·hm-2·a-1,N2:100 kg·hm-2·a-1,N3:150 kg·hm-2·a-1,and N4:200 kg·hm-2·a-1)were compared with a control group.Over one growing season,the effects of different nitrogen inputs on community aboveground biomass,community composition,and species diversity were analyzed to elu-cidate the key pathways through which short-term nitrogen application enhances aboveground biomass.Nitrogen application exerted a unimodal effect on aboveground biomass,with N3 treatment yielding the optimal result,a 52.08%increase relative to the control.The biomass of the dominant species,Dactylis glomerata,increased by 132.12%relative to the control.There were significant increases in community height and cover,but not in com-munity density.Nitrogen application caused significant alteration in species diversity patterns:The importance value of D.glomerata increased by 65.01%under the N3 treatment relative to the control,whereas the impor-tance value of the primary associate species,Trifolium repens,decreased by 65.54%under the N4 treatment rela-tive to the control.Overall,community diversity first decreased and then increased as the nitrogen application rate increased,with the lowest diversity observed under the N3 treatment.Mantel tests revealed that species diversity was regulated primarily by the biomass of subdominant species and the density of dominant companion species.Structural equation modeling indicated that nitrogen application exerted significant,positive,and direct effects on-ly on dominant and subdominant species.Overall,a nitrogen rate of 150 kg·hm-2·a-1 was most effective for vege-tation restoration in the semiarid mountain grasslands of Yili,Xinjiang.关键词
伊犁河谷/施氮量/群落成员型/物种多样性Key words
Yili River Valley/nitrogen application rate/community element type/species diversity引用本文复制引用
陈月芳,李玉乐,李政升,牛克昌,周会程,提力哈吾里·达合木拜,巴雅尔塔,童永尚..短期施氮对新疆伊犁半干旱山地草原植物群落及物种多样性的影响[J].干旱区研究,2026,43(5):1001-1012,12.基金项目
国家自然科学基金项目(32560918) （32560918）
伊犁师范大学高层次人才引进启动基金(2024RCYJ28) （2024RCYJ28）
