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OA
Carbon and nitrogen stable isotope composition and water use efficiency in dominant herbaceous leaves from the grassland of the Bashang area,Hebei Province,China
在塞北管理区,采集天然草地和人工草地的不同草本植物叶片样品共 14 个,采用稳定同位素比率质谱仪测定其叶片碳氮同位素丰度值(δ13C、δ15N),对比分析不同植物种的水分利用效率(PWUE)差异,为筛选适宜坝上地区种植的草本植物资源提供参考数据.结果表明,14 种植物叶片的 δ13C 范围为-29.20‰—-15.95‰,处于全国平均水平;δ15N 范围为-2.12‰-10.75‰,在中国北方植物叶片相应值分布区间内.人工草地的 δ13C 和 δ15N 的值均最大,滩地的天然草地 δ13C 值最小,半阳坡的天然草地 δ15N 的值最小.不同草地类型 δ13C 和 δ15N 的值呈现显著线性正相关,而不同植物叶片的 δ13C 和 δ15N 对当地温度、降水、土壤等环境因子的综合响应结果却是不同步的.不同植物叶片的 Δ13C 为 7.02‰-20.77‰,Δ13C 在天然草地之间差异性较小,但是与人工草地差异较大.PWUE 为 66.85-214.38 μmol·mol-1,人工种植的紫花苜蓿和黄芪的 PWUE 大于天然草地的所有植物种类.就生境类型而言,天然草地的滩地草本植物 PWUE 最低,半阳坡和半阴坡植物的 PWUE 较为接近.从滩地到坡地,各生境的水热条件有所不同,尤其是水分条件差异较为明显,草本植物为适应所处生境而采用了不同的水分利用策略,因此有不同的 PWUE,是其维持群落稳定性和多样性的策略之一.研究结果可为恢复坝上地区退化草地及其生态系统多样性提供理论依据.
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.
侯翔龙;廉诗启;李娜;曹建生;阳辉
河北省科学院地理科学研究所,石家庄 050011||河北省地理信息开发应用工程技术研究中心,石家庄 050011丰宁满族自治县林业和草原局,丰宁 068350国营涞源县甸子梁林场,涞源 074300中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄 050022||中国科学院农业水资源重点实验室,石家庄 050022中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄 050022||中国科学院农业水资源重点实验室,石家庄 050022
农业科技
河北坝上δ13Cδ15N水分利用效率,碳同位素分辨率
Bashang areaδ13Cδ15Nwater use efficiencycarbon isotope discrimination
《生态科学》 2026 (2)
89-97,9
河北省科学院基本科研业务费试点项目(2025PF05)河北省科技支撑计划(22324202D)
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