【摘要】 【目的】研究黄河下游河岸带典型草本植物地上部分、根系和土壤碳、氮含量，并分析其相关关系，旨在为黄河河岸带生态系统服务评估和恢复重建提供科学依据。【方法】通过比较黄河河岸带芦苇(Phragmites australis)、拂子茅(Calamagrostis epigeios)、地肤(Kochia scoparia)和莎草(Cyperus rotundus)4种典型草本植物地上部分、根系和土壤的碳、氮含量及化学计量比，探讨河岸带草本植物地上部分、根系与土壤碳氮化学计量比的关系。【结果】(1)莎草地上部分N含量显著高于其他3种草本植物(P<0.05),芦苇地上部分碳氮比显著高于拂子茅和莎草(P<0.05);4种植物的根系C、N含量及碳氮比均无显著性差异(P>0.05)。(2)芦苇土壤C、N含量均显著高于其他3种植物；而芦苇草地土壤碳氮比显著低于其他3种植物。(3)4种植物地上部分和根系C、N含量无显著相关性(P>0.05);根系C含量与土壤C、N含量呈显著正相关关系(P<0.05、P<0.01),而植物地上部分C、N含量和根系N含量与土壤C、N含量均无显著相关性(P>0.05)。【结论】4种典型草本植物显著影响了土壤的C、N含量，芦苇和拂子茅具有相对较高的固碳和固氮潜力。研究区土壤C含量高于全国平均水平，C/N均值表明N是研究区的限制性营养元素，植被恢复易受到土壤N含量的限制。更多还原

【Abstract】 【Objective】The above-ground, root and soil carbon and nitrogen contents of typical herbaceous plants in the riparian zone and their correlation were studied, aiming to evaluate the ecosystem function in the Yellow River riparian zone and provide scientific basis for restoration and reconstruction. 【Method】This article compared the aboveground, root and soil carbon and nitrogen contents and stoichiometric ratios of four typical herbaceous plants, such as Phragmites australis, Calamagrostis epigeios, Kochia scoparia, and Cyperus rotundus in the Yellow River riparian zone. And the correlation among them were systematically observed. 【Result】(1) The N content in above-ground of Cyperus rotundus was significantly higher than the other three herbaceous plants(P<0.05). The C∶N ratio in above-ground of Phragmites australis was significantly higher than that of Calamagrostis epigeios and Cyperus rotundus(P<0.05). There was no significant difference of C, N contents and C∶N ratio in the roots of 4 plants(P>0.05).(2) The soil C and N contents of Phragmites australis were significantly higher than other herbaceous plants, while the C∶N ratio in Phragmites australis soil was significantly lower than other herbaceous plants.(3)There were no significant correlation between above-ground and root C and N contents(P>0.05) in 4 plants; The root C content showed a significantly positive correlated with the soil C, N contents(P<0.05,P<0.01). While the C and N contents in aboveground and N contents in root of plants had no significant correlation with soil C and N contents(P>0.05). 【Conclusion】Four typical herbaceous plants significantly affected soil C and N contents. Phragmites australis and Calamagrostis epigeios have relatively high carbon and nitrogen fixation potential. The soil C content in the study area is higher than the national average level. The mean value of C∶N ratio indicates that N is the limiting nutrient element in the study area, and vegetation restoration is easily limited by soil N content.更多还原