干旱区研究2025，Vol.42Issue(12)：2245-2255,11.DOI:10.13866/j.azr.2025.12.08
科尔沁草原四种典型群落植物与土壤碳氮磷化学计量特征
Carbon,nitrogen,and phosphorus stoichiometry in plants and soils in four typical plant communities in the Horqin Grassland
摘要
Abstract
To understand the responses of nutrient levels and carbon,nitrogen,and phosphorus stoichiometry in different plant communities to soil factors in semiarid grassland ecosystems,this study focused on four represen-tative plant communities in the Bairin Right Banner Grassland,located at the western edge of the Horqin Grass-land:Leymus chinensis,Phragmites australis,Ephedra sinica,and Chloris virgata.Based on the methodology of ecological stoichiometry,we examined differences and interrelations in carbon,nitrogen,and phosphorus concen-trations and their stoichiometric ratios among dominant species,associated species,plant communities,and their soils.Dominant species exerted strong control over nutrient levels within plant communities,supporting the"mass ratio hypothesis."C.virgata displayed notably high N and P concentrations(17.3 g·kg-1 and 1.41 g·kg-1,respectively),with its community similarly exhibiting higher N(17.6 g·kg-1)and phosphorus concentrations(1.36 g·kg-1)than other species and communities.L.chinensis and its community had the highest C concentra-tions(395 g·kg-1 and 365 g·kg-1,respectively).Soil nutrient contents and carbon,nitrogen,and phosphorus stoi-chiometry varied significantly among communities.The E.sinica community had higher soil organic carbon(1.36%)and total nitrogen levels(0.118%)than the other communities,whereas the soil total phosphorus level was lowest under Phragmites australis(0.0137%).The C.virgata community displayed notably lower soil C:P(33.0)and N:P(3.04).Additionally,soil pH was significantly elevated in the Ephedra sinica community(9.67).Redundancy analysis demonstrated that the soil carbon:phosphorus ratio,a key indicator reflecting the degree of phosphorus availability constraint,is the primary factor regulating the stoichiometric balance of C,N,and P in plants and soils across different plant communities in the Horqin grassland,highlighting its critical role for eco-system nutrient cycling and management.关键词
生态化学计量/碳氮磷/植被类型/科尔沁草原Key words
ecological stoichiometry/carbon,nitrogen and phosphorus/plant community type/Horqin Grass-land引用本文复制引用
ZHENG Mengyue,LIU Chenxu,ZHANG Huayi,AMEN Buhe,QIDU Jiya,HAN Bo,XIN Honglin,WU Yunna,SONG Yantao..科尔沁草原四种典型群落植物与土壤碳氮磷化学计量特征[J].干旱区研究,2025,42(12):2245-2255,11.基金项目
辽宁省科技计划联合计划应用基础研究项目(2023JH2/101700027) （2023JH2/101700027）
中央高校基本科研业务费资助(2025) （2025）
2023年服务赤峰市乡村振兴高质量发展研究课题(cfsxczxyjy202314) （cfsxczxyjy202314）
