草业学报2025，Vol.34Issue(9)：26-37,12.DOI:10.11686/cyxb2024412
地上净初级生产力对植物物种丰富度的响应及影响因子分析
Response of aboveground net primary productivity to plant species richness and identification of the factors of influence
摘要
Abstract
The productivity of grassland ecosystems is largely influenced by their dominant and subdominant species.However,relatively few studies have explored the effects of species richness established by different combinations of dominant species and subdominant species on aboveground productivity.Therefore,to explore the direct and indirect driving factors of dominant and subdominant plant community productivity,we conducted monoculture and mixed-culture experiments using three dominant species and seven subdominant species from the Yanchi desert steppe in northern Ningxia.Five degrees of plant species richness(monoculture and 4-,6-,8-,and 10-species mixtures)were established,and the aboveground biomass,soil microbial community composition,extracellular enzyme activity,and soil physicochemical properties were investigated in each group.The results show that:1)Mixtures of both dominant species and subdominant species increased the total relative abundance of the dominant bacterial phyla(Actinobacteriota,Acidobacteriota and Proteobacteria)and dominant fungal phyla(Ascomycota and Basidiomycota),and the increase in the total relative abundance of dominant bacterial phyla was more obvious than that of dominant fungal phyla.2)The vector length of monocultures and mixed cultures ranged from 1.31 to 1.38,and the vector angle was greater than 45°.Soil microbial metabolism was mainly limited by soil carbon and phosphorus.The nitrogen∶phosphorus was significantly higher in monoculture soil than in 4-species mixed-culture soil(P<0.05).3)There was a significant positive correlation between aboveground net primary productivity and species richness(P<0.001),and both the complementarity effect and the selection effect made significant positive contributions to the observed net primary aboveground productivity.4)The structural equation model showed that plant species richness indirectly and positively affected aboveground productivity of the plant community through a selection effect,a complementarity effect,and soil physical and chemical properties.The results of this study provide data support and theoretical guidance for devising strategies to protect grassland biodiversity and strengthen grassland ecosystem restoration.关键词
植物物种丰富度/微生物群落/土壤酶化学计量/土壤特性/生产力Key words
plant species richness/microbial community/soil enzyme stoichiometry/soil characteristics/productivity引用本文复制引用
罗叙,马慧,韩翠,赵雅欣,赵莹,谢应忠,李建平..地上净初级生产力对植物物种丰富度的响应及影响因子分析[J].草业学报,2025,34(9):26-37,12.基金项目
国家自然科学基金(32160336),宁夏自然科学基金(2023AAC02029,2023AAC03092)和宁夏大学草学一流学科建设项目(NXYLXK2017A01)资助. （32160336）
