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[目的]研究氮肥对不同退化程度草场羊草光合速率的影响。[方法]以内蒙古白音锡勒牧场羊草为研究对象,通过对草地进行不同的氮肥处理(0、30、50、80g/m2),分析在不同氮肥梯度下羊草光合速率所受的影响,以及氮肥对不同退化程度草场的影响。[结果]随氮肥梯度的增加,羊草光合速率随之增加;不同退化程度的草原群落中,羊草种群光合速率对氮肥的响应程度不同,退化严重的草场中羊草种群对氮肥的响应程度较好。[结论]氮肥对于退化严重的草场恢复可起到较好的促进作用。
[Objective] The research aimed to study the effects of nitrogen fertilizer on the photosynthetic rate of Leymus chinensis in different degraded grassland. [Method] With Leymus chinensis in Baiyinxile pasture of Inner Mongolia as the research object, the effects of different nitrogen fertilizer treatments (0, 30, 50 and 80 g / m2) on the photosynthetic rate of Leymus chinensis under different nitrogen fertilizer gradients were analyzed , And the effects of nitrogen fertilizer on grassland with different degrees of degradation. [Result] The photosynthetic rate of Leymus chinensis increased with the increase of nitrogen fertilizer gradient. The responses of Leymus chinensis population photosynthetic rate to nitrogen fertilizer varied with different degraded grassland communities. The response of Leymus chinensis populations to nitrogen fertilizer better. [Conclusion] The nitrogen fertilizer could play a good role in promoting the degenerated grassland restoration.