草业科学2025，Vol.42Issue(4)：1000-1012,13.DOI:10.11829/j.issn.1001-0629.2024-0169
黔西南3种常见草本植物碳氮特征比较
Comparative study of carbon and nitrogen characteristics in three common herbaceous plant species in southwestern Guizhou
摘要
Abstract
Carbon(C)and nitrogen(N)are essential elements of plant tissues,with nitrogen playing a critical role in plant growth,development,and metabolism.However,comprehensive studies comparing the C and N characteristics across species and plant organs of herbaceous plants in southern China remain limited.In this study,based on a transect survey method,12 sampling sites in southwestern Guizhou were selected for field sampling and subsequent laboratory analysis.The aim was to investigate the differences in C and N contents and C∶N ratios among species and plant organs in Trifolium repens,Cynodon dactylon,and Dactylis glomerata,and to assess the relationships between C and N characteristics,climatic variables,and plant functional traits.Significant interspecific differences were observed in C and N contents and C∶N ratios among the three species.Specifically,the stem C content of C.dactylon was significantly higher than that of T.repens and D.glomerata(P＜0.05).In contrast,the C∶N ratios in the roots,stems,and leaves of C.dactylon were significantly higher than those of the other two species.Significant differences in C and N contents and C∶N ratios were also observed among different plant organs.C content exhibited lower coefficients of variation than N content across organs,and the C∶N ratios of roots and stems were generally higher than those of leaves.Average annual temperature was significantly correlated with the C and N characteristics of T.repens.Canonical correspondence analysis(CCA)revealed that variation in C and N characteristics of T.repensand C.dactylon could be explained by average annual precipitation.Moreover,leaf length and leaf area of C.dactylon were significantly associated with the soil C∶N ratio(P＜0.05).The effects of future climate change on the C∶N ratios of these herbaceous species appear to be species-specific.These findings may support the informed management and sustainable utilization of grasslands in southwestern Guizhou under changing climatic conditions.关键词
碳氮含量/植物功能性状/气候变化/碳氮比/生态化学计量学/贵州省/南方草山草坡Key words
carbon and nitrogen contents/plant functional traits/climate change/C∶N ratio/ecological stoichiometry/Guizhou Province/southern mountainous grasslands引用本文复制引用
谭友荃,吐地·依米提,平晓燕,董世魁..黔西南3种常见草本植物碳氮特征比较[J].草业科学,2025,42(4):1000-1012,13.基金项目
国家林业和草原局业务委托项目(2021041007) （2021041007）
北京林业大学科技创新计划项目(2019ZY10) （2019ZY10）
