以生长季中期羊草成熟叶片为试材,采用C/N元素分析仪和钼蓝比色法测定其C、N、P元素浓度,并计算C、N、P化学计量比值,分析了不同频次的刈割处理对羊草C、N、P化学计量特征的影响,以期揭示刈割对植物养分状况的影响。结果表明:刈割后羊草叶片C浓度与对照(不刈割)相比有降低的趋势,N、P元素浓度有显著升高的趋势。随着刈割频次的加重C浓度逐渐降低,不同刈割频次间差异不显著;N、P浓度随着刈割强度的增加逐渐升高。刈割后C/N和C/P与对照相比显著下降,且随刈割频次的加重,比值逐渐变小,刈割频次间差异不显著。刈割后N/P与对照相比也有下降的趋势,且随刈割频次的加重,比值逐渐变大。对照与不同频次刈割处理的N/P均大于16。说明不同频次刈割对羊草叶片N/P的影响很小,羊草生产力主要受P元素限制。高频次的刈割会导致生物量下降,养分流失严重,植物生长速度与植物氮和磷的利用效率受到影响,刈割1年休1年是最好的管理措施。 The mature leaves of Leymus chinensis in mid-growing season were used as test materials, C, N and P elemental concentrations were determined by C / N elemental analyzer and molybdenum blue colorimetric method, and the stoichiometry ratios of C, N and P were calculated. The effects of cutting on the C, N, P stoichiometry of Leymus chinensis were studied in order to reveal the effect of clipping on plant nutrient status. The results showed that the C concentration of Leymus chinensis leaves showed a decreasing trend compared with the control (without cutting), and the concentrations of N and P significantly increased. With the aggravation of cutting frequency, the concentration of C decreased and the difference between different cutting frequencies was not significant. The concentrations of N and P increased with the increase of cutting strength. After cutting, C / N and C / P decreased significantly compared with the control, and with the increase of cutting frequency, the ratio became smaller and the difference between clipping frequencies was not significant. Compared with the control, N / P also showed a decreasing trend after mowing, and the ratio gradually increased with the increase of mowing frequency. The N / P of mowing treatments with different frequency and frequency were all greater than 16. The results showed that the effects of different cutting frequency on N / P of Leymus chinensis leaves were very little, and the productivity of Leymus chinensis was mainly limited by P element. High-frequency cutting will lead to the decline of biomass, serious loss of nutrients, plant growth rate and plant nitrogen and phosphorus utilization efficiency are affected, cutting 1 year off for 1 year is the best management measures.