中国草地学报2025，Vol.47Issue(8)：76-85,10.DOI:10.16742/j.zgcdxb.20250086
不同施磷量对'巴青'垂穗披碱草土壤细菌群落的影响
Effects of Different Phosphorus Application Rates on Soil Bacterial Communities of Elymus nutans'Baqing'
摘要
Abstract
Rational utilization of native grass species supports sustainable grassland development and ecological conservation on the Qinghai-Tibet Plateau.Understanding the effects of phosphorus(P)applica-tion on soil bacterial community composition,diversity,and assembly processes is essential for advancing native grass cultivation.This study focused on Elymus nutans'Baqing'to evaluate the impact of different P application rates(CK:0 kg/hm2,P1:60 kg/hm2,P2:120 kg/hm2,P3:180 kg/hm2)on soil bacterial communities.The results showed that Proteobacteria,Acidobacteriota,and Actinobacteriota accounted for more than 75%of the cumulative relative abundance at the phylum level across P treatments and served as core taxa in the co-occurrence network.Compared to CK,P application significantly reduced richness indices while increasing evenness indices.Notably,the P2 treatment resulted in further reductions in both Shannon and Simpson diversity indices(P<0.05).Variations in community diversity were significantly correlated with total P,total potassium,and available P(P<0.01).Changes in bacterial composition at the phylum level were significantly associated with soil organic matter,total nitrogen,total P,total potas-sium,available P,and available potassium(P<0.05).The co-occurrence network was dominated by positive interactions(93.71%),with only 6.29%being negative.Neutral community model analysis indi-cated that stochastic processes dominated bacterial community assembly.Overall,this study demonstrates how P application alters soil bacterial communities,providing a theoretical basis for improving native spe-cies cultivation and guiding the ecological restoration of alpine grasslands.关键词
乡土植物/土壤养分/群落多样性/共现网络/群落组装过程Key words
Native plants/Soil nutrients/Community diversity/Co-occurrence network/Community assembly processes分类
农业科技引用本文复制引用
王明涛,苗彦军,郑少龙,张永安,雷变霞,王传旗,周健..不同施磷量对'巴青'垂穗披碱草土壤细菌群落的影响[J].中国草地学报,2025,47(8):76-85,10.基金项目
甘肃省教育厅:高校教师创新基金项目(2024B-254、2024B-261) （2024B-254、2024B-261）
甘肃省青年人才团队项目(2025QNTD14) （2025QNTD14）
