生态科学2026，Vol.45Issue(2)：89-97,9.DOI:10.14108/j.cnki.1008-8873.2026.02.009
河北坝上草原优势草本叶片碳氮稳定同位素组成与水分利用效率
Carbon and nitrogen stable isotope composition and water use efficiency in dominant herbaceous leaves from the grassland of the Bashang area,Hebei Province,China
摘要
Abstract
A total of 14 leaf samples from different herbaceous plants were collected from natural and artificial grasslands in the Saibei Administrative Area of the Bashang region,Hebei Province,China.Stable isotope ratio mass spectrometry was used to determine the carbon and nitrogen isotope abundances(δ13C and δ15N)in the leaves.The differences in plant water use efficiency(PWUE)among species were compared to provide reference data for selecting herbaceous plant resources suitable for cultivation in the Bashang area.The results showed that δ13C values ranged from-29.20‰ to-15.95‰,which was consistent with the national average for herbaceous plants,while δ15N values ranged from-2.12‰ to 10.75‰,falling within the distribution range reported for plant leaves in northern China.Both δ13C and δ15N values were highest in artificial grassland,δ13C was the lowest in natural grasslands on flat lowlands,and δ15N was the lowest in natural grassland on semi-sunny slopes.Across different grassland types,δ13C and δ15N values showed a significant positive linear correlation.However,the response patterns of δ13C and δ15N to combined environmental factors(temperature,precipitation,soil)were not synchronized among different species.Leaf Δ13C ranged from 7.02‰ to 20.77‰,with little variation among natural grassland sites but significant differences compared to artificial grasslands.PWUE ranged from 66.85 to 214.38 μmol·mol-1,and was higher in the planted species(Astragalus membranaceus and Medicago sativa)than in all natural grassland species.In terms of habitat type,PWUE was the lowest for herbaceous plants on flat lowlands of natural grasslands,and was relatively similar between semi-sunny and semi-shady slopes.From flat lowlands to south-facing slope,hydrothermal conditions varied,with particularly pronounced differences in water availability.Herbaceous plants adopted different water use strategies to adapt to their habitats,resulting in distinct PWUE,which represented a strategy for maintaining community stability and diversity.This study provides a theoretical basis for the restoration of degraded grasslands and their ecosystem diversity in the Bashang area,Hebei Province,China.关键词
河北坝上/δ13C/δ15N/水分利用效率,碳同位素分辨率Key words
Bashang area/δ13C/δ15N/water use efficiency/carbon isotope discrimination分类
农业科技引用本文复制引用
侯翔龙,廉诗启,李娜,曹建生,阳辉..河北坝上草原优势草本叶片碳氮稳定同位素组成与水分利用效率[J].生态科学,2026,45(2):89-97,9.基金项目
河北省科学院基本科研业务费试点项目(2025PF05) （2025PF05）
河北省科技支撑计划(22324202D) （22324202D）
